Research in the Klamath Basin
20 07 Annual Report
Red-skinned and Specialty
Potato Variety Development, 2007
Brian A. Charlton and Darrin A. Culp1
Introduction
Potato variety development in the Pacific Northwest continues to emphasize
russet-skinned selections for processing and fresh market. However, recent efforts have
begun to focus on selections with disease and pest resistance, and nutritional qualities
including enhanced antioxidants and Vitamin C content.
Over the past decade the Tri-state program has released several red-skinned,
white-fleshed varieties, three of which were Oregon releases (Rykbost et al. 2001a, b;
2003). More recently, breeding efforts have focused on selections with varying flesh and
skin color combinations, many of which have shown to contain higher concentrations of
carotenoids, anthocyanins, ascorbic acid (vitamin C), and other sources of antioxidants.
Colorado State University released Purple Majesty, a purple-skinned, purple-fleshed
variety and Mountain Rose, a red-skinned, red-fleshed variety. Oregon is also pursuing
release of the selections POR01PG20-12, a red-flesh, red-skin cultivar, POR01PG22-1 a
red-flesh, red-skin fingerling type, and POR01PG16-1 a purple-flesh, purple-skin
fingerling.
Breeding progeny are supplied by programs at the USDA Agricultural Research
Service (ARS) facility in Prosser, Washington, Oregon State University (OSU) Crop and
Soil Science Department, and the ARS facility in Aberdeen, Idaho. The Klamath Basin
Research and Extension Center (KBREC) serves as an initial field screening site for firstgeneration selections, second-year evaluation of four-hill plantings, and the third-year
evaluation at the early Preliminary Yield Trial-1 (PYT) level. Once selections graduate
from the PYT-1 Trial they enter the Statewide Red-skinned/Specialty Trial. Following
one to three years of evaluation at the statewide level, entries are eligible for evaluation in
the Western Regional Red-skinned/Specialty Trial.
Procedures
Single-hill Screening
Approximately, twenty-three thousand (23,000) greenhouse-produced seedling
tubers were planted at a conifer tree seedling nursery in Yonna Valley on May 31.
Located about 25 miles east of Klamath Falls, soils are very sandy with approximately
1
Assistant Professor and Faculty Research Assistant, respectively, Klamath Basin Research and Extension
Center, Klamath Falls, OR.
Acknowledgements: Partial financial support for this program from the Oregon Potato Commission; the
Cooperative State Research, Extension, and Education Service (CSREES); and the USDA Agricultural
Research Service (ARS) is gratefully recognized.
Reference to a product or company is for specific information only and does not endorse or recommend
that product or company to the exclusion of others that may be suitable.
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Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 10
Research in the Klamath Basin
20 07 Annual Report
1.0 percent organic matter and a pH of 7.0. The field was treated with Terr-O-Gas 67
(methyl bromide + chloropicrin, Great Lakes Chemical Corp.) at 25 gal/acre in the spring
of 2003 and used for coniferous tree seedling production in 2003 and 2004. Austrian
winter pea and oats were planted as a green manure cover crop in 2006.
Progeny included 119 families from Corvallis, Oregon, 36 from Prosser,
Washington and 121 from Aberdeen Idaho. Several crosses included parents with virus,
late blight and potato tuber worm resistance. Others included at least one parent with
pigmented flesh color.
Seedling tubers were planted on May 29 with a 2-row, assisted-feed planter at 3-ft
in-row spacing in 36-inch rows. Fertilizer was banded at planting at a rate of 100-100100-120 lb/acre of Nitrogen (N), Phosphate (P2O5), Potash (K2O), and Sulfur (S)
respectively. The insecticide Admire Pro (imidacloprid, Bayer CropScience) at 5-6 fl. oz.
/ acre and the fungicide Quadris (azoxystrobin, Syngenta) at 6-8 fluid oz. / acre were
applied in-furrow over the seed piece. Rows were bedded and leveled off with a rolling
cultivator and drag bar on June15. The pre-emergence herbicides Dual II Magnum (smetalachlor, Syngenta), Prowl H2O (pendimethalin, BASF), and Matrix (rimsulfuron,
Dupont) were applied at labeled rates July 5. Following application, the herbicides were
incorporated with 0.43 inches of irrigation. On July 26 and August 10 the fungicide
Ridomil Gold Bravo (mefenoxam/chlorothalinil, Syngenta) and the insecticide Leverage
(imidacloprid, cyfluthrin, Bayer CropScience) were applied aerially at labeled rates.
Irrigation was applied using solid-set sprinklers arranged in a 40- by 42- ft diamond
pattern as needed.
Vines were shredded with a flail chopper on September 28, followed by an
application of Reglone (diquat dibromide, Syngenta) at 1.5 pt. /acre with a ground
sprayer. Tuber families were lifted with a two-row, level bed digger on October 16. A
selection team including researchers, extension, and industry personnel selected desirable
clones from various families immediately after lifting. As expected, selection was based
primarily on external and internal visual appearance. All retained material was
transported to Powell Butte, Oregon for storage at the Central Oregon Agricultural
Research Center (COARC) potato facility.
Second-year 4-hill Screening
Ninety-two selections from 2006 single hills were planted in 4-hill observational
plots at KBREC and 18-hill seed increase plots at Powell Butte. The KBREC site is on a
Poe fine sandy loam soil with a pH of 6.8 and an organic matter content of 1.02 percent
in the plow layer. The location was cropped to teff grass hay the previous year, which
was treated with roundup during the fall of 2006 to aid in breakdown of material through
the winter. Gypsum was applied at a rate of 2000 lbs/acre on April 11. Field preparation
included discing twice, roto-tilling once, and moldboard plowing once to break up sod in
April 2006. Fumigation treatments included TeloneTM II (dichloropropene, Dow
AgroSciences) at 15 gal/acre (gpa) and Vapam (sodium methyldithiocarbamate,
AMVAC) at 25 gpa applied on April 26, 2007, followed by several harrowing passes on
May 7. Dry pre-plant fertilizer was broadcasted on May 9 followed by liquid fertilizer
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Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 11
Research in the Klamath Basin
20 07 Annual Report
applied at bed formation on May 10. Total pre-plant fertilizer included 165 lb Nitrogen
(N), 80 lb Phosphate (P2O5), 100 lb Potash (K20) and 140 lb Sulfur (S).
Seed was hand cut to approximately 1.5-2.0 oz/seed piece on May 9, treated with
Tops MZ (thiophamate-methyl, mancozeb, Bayer CropScience), and suberized for 2
weeks at 550F and approximately 95 percent relative humidity. The trial was planted at
9-inch spacing in 36-inch rows with an assisted-feed, 2-row planter on May 23. The
insecticide Admire Pro (imidacloprid, Bayer CropScience) at 5-6 fl. oz. / acre and the
fungicide Quadris (azoxystrobin, Syngenta) at 6-8 fluid oz. / acre were applied in-furrow
over the seed piece.
Planted rows were bedded up and leveled off with a rolling cultivator and drag bar
followed by a pre-emergence application of Dual II Magnum (s-metalachlor, Syngenta) at
1.3 pt./ acre and Prowl H2O (pendimethalin, BASF) at 1.5 pt./ acre on June 12 for
broadleaf and grass weed control. Immediately following application, 0.43 inches of
irrigation was supplied to incorporate the herbicides. Matrix (rimsulfuron, Dupont) was
applied post-emergence at 1 oz. / acre on July 5 and incorporated with 0.25 inches of
irrigation. A total of 19.7 inches of water (irrigation plus rainfall) was applied during the
growing season with sprinklers arranged in a 40- by 48-ft. pattern.
Ridomil Gold Bravo (mefenoxam/chlorothalinil, Syngenta) and the insecticide
Leverage (imidacloprid, cyfluthrin, Bayer CropScience) were applied aerially on July 26
followed by an additional application of Ridomil Gold on August 10 at labeled rates.
Vines were rolled and followed by an application of the desiccant Reglone (diquat
dibromide, Syngenta) at 1.5 pt. /acre on September 10.
Potato tubers were lifted using a single-row, level bed digger on October 15.
Cooperators from four locations around the state assisted with clonal selection based on
marketability and potential disease resistance. Seed of these selections were transported
and stored at the Central Oregon Agricultural Research Center (COARC).
Preliminary Yield Trial
Red-skinned and specialty selections from the 2006 4-hill screening were
evaluated in a Preliminary Yield Trial-1 (PYT) with 2 replications of 20 hills. Most of
the material had pigmented skin and/or flesh. The trial was arranged in a randomized
complete block design. Entries for the PYT-1 Red/Specialty Trial included the standard
varieties Yukon Gold, All Blue and 35 numbered selections. Seed was hand cut to
approximately 1.5-2.0 oz/seed piece on May 9, 10 and 11, treated with Tops MZ
(thiophamate-methyl, mancozeb, Bayer CropScience), and suberized as described above.
The trial was planted at 9-inch spacing in 36-inch rows with an assisted-feed, 2-row
planter May 23. All cultural practices were identical as those described for the 4-hill
trial.
Plant stands were monitored on June13 and 27. Both replications were harvested
using a one-row digger-bagger on October 11. All tubers from each plot were stored at
550F until grading in early to mid November. Using USDA potato grade standards, each
plot was graded into U.S. No. 1s, No. 2s, B’s (under 4 oz.) and culls. U.S. No. 1s were
separated by weight to 4- to 6-oz, 6- to 10-oz, and over 10-oz groupings. Sub-samples of
approximately 10 lbs from the 6- to 10 oz. fraction were used to determine specific
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Research in the Klamath Basin
20 07 Annual Report
gravity by the weight-in-air, weight-in-water method. Ten tubers from the over 10-oz
were selected at random and cut lengthwise to determine internal defects.
External characteristics were noted for each replication. Potatoes were
downgraded to No. 2s or culls if growth cracks, knobs, or misshapen tubers were severe
enough according to USDA grade standards. Yields for U.S. No. 1s were not adjusted to
account for external blemishes such as Rhizoctonia or silver scurf or internal defects such
as hollow heart, brown center, and others.
Statewide Red-skinned/Specialty Trial
Entries in the Statewide Red-skinned/Specialty Trial included standard varieties
Yukon Gold, All Blue, and 9 numbered selections. The majority of the numbered
selections possessed unique skin and/or flesh color combinations. The trial had 4
replications of 30-hill plots arranged in a randomized complete block design. Seed was
cut as described above and suberized prior to planting on May 23. Cultural practices
were identical as those described for the 4-hill trial. Plant stands were monitored on June
13 and 27. Harvest on October 11 was performed using a one-row digger-bagger. All
tubers were saved for grading in early November.
Plots were graded as listed above using USDA standards. Unlike the PYT Redskinned/Specialty Trial, which included only two replications, data collected from this
trial was analyzed using SAS for Linear Models 9.1 (SAS Institute Inc.) software. Least
significant differences (LSDs) were calculated based on the student’s t test at the 5
percent probability level. Only a portion of the data obtained is reported here. Data from
all trial locations were summarized and reports were reviewed by all cooperators on
January 3 and 4, 2008 as the basis for decisions on disposition of trial entries.
Regional Red-skinned/Specialty Trail
Dark Red Norland, Red LaSoda, All Blue, Yukon Gold, and 20 numbered
selections were compared in the Western Regional Red-skinned/Specialty Trial. Entries
were grouped into 5 categories, including; red-skin/white-flesh, red-skin/yellow-flesh,
red-skin/red-flesh, purple-skin/purple-flesh, and yellow flesh. Site locations for this trial
occurred at 9 different locations throughout Oregon, Washington, Idaho, Colorado,
Texas, and California. At KBREC, the trial consisted of 4 replications of 30-hill plots
arranged in a randomized complete block design. All seed cutting, site preparation, and
cultural management were identical to those listed above for the 4-hill and PYT-1 trials.
Plant stands were monitored on June 13 and 27. Tubers were harvested October 8 using
a one-row digger-bagger. All tubers were saved for grading in early to mid November.
Grading practices are the same as those listed above for the PYT-1 trial using USDA
standards. Data was analyzed as described in the Statewide trial. Data from the nine
regional cooperators were compiled and summarized at KBREC and reviewed at the
Western Regional Potato Variety Development Committee annual meeting in February
2008. Disposition of trial entries was determined primarily by the sponsoring state
organization. Due to the large number of entries in this trial, it was decided entries could
graduate upon completion of two years in this trial and be proposed for possible release.
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Research in the Klamath Basin
20 07 Annual Report
Results and Discussion
Single-hill Screening
Approximately 75 percent of the clones produced relatively vigorous plants with
good tuber yields. Maturity varied widely and many late-maturing clones produced large
vines that were not completely desiccated at harvest. Several tuber families possessed
extremely small tuber sizes that were excessively sprouted at the time of planting.
Sprouts were removed to prevent tubers from clinging to the planter wheel which
combined with small tuber size significantly delayed emergence. As a result, many of
these families did not have sufficient tuber size at harvest for optimum selection. The
selection team retained 195 clones or approximately 0.8 percent of the initial planting
density. Of the 195 clones retained, 47 were from Oregon State University and 31 from
USDA, Prosser Washington crosses; most of which possessed various skin colors and
pigmented flesh. An additional 117 clones were retained from USDA, Aberdeen Idaho
crosses and were mostly russet-type selections with various disease and pest resistance
genetics. Retained clones from OSU and USDA, Prosser will be evaluated in 4-hill plots
at KBREC in 2008.
Second-year 4-hill Screening
A team of about 15 research and industry personnel selected 14 clones for further
evaluation. This material will be evaluated in a Preliminary Yield trial conducted at
KBREC and possibly other locations throughout the Pacific Northwest in 2008.
Preliminary Yield Trial
A partial summary of characteristics of the clones selected for further evaluation
based on performance at KBREC is presented in Table 1. Yield is not the most important
factor in the selection process for specialty-type cultivars as it is in traditional russet-type
cultivars for processing or fresh market use. Although yield is still an important factor,
more emphasis is paid to tuber appearance. All entries achieved good emergence except
Yukon Gold which was less than 90 percent. Vine maturity was similar to or slightly
earlier than Yukon Gold for all selections. Input from fresh market and processing
sectors suggest that yellow-flesh potatoes have strong demand in the market place;
therefore, the majority of selections retained reflect this trend. Only three selections with
red, purple, or multiple flesh colors were retained for further evaluation. Yields and tuber
size distribution observed in the material selected at KBREC ranged widely (Table 2).
Yukon Gold had the largest tuber size profile with 145 cwt in excess of 10 oz. Trends in
both fresh market and processing sectors have identified markets for small tubers less
than 4 oz. Seven of the 9 selections showed yields of tubers less than 4 oz in excess of
100 cwt/a with OR04131-2, POR05PG10-1, and POR05PG56-1 surpassing 200 cwt/a of
tubers less than 4 oz. All entries except OR04036-5 and OR04036-7 had specific
gravities high enough for processing. OR04198-1, POR05PG10-1, and POR02PG12-1
had extremely short dormancy which normally would have caused these selections to be
dropped from further evaluation. However, extremely dark yellow flesh and high
percentages of tubers less than 4 oz for OR04198-1 and POR05PG10-1 warranted further
evaluation. Plans to see how these selections respond to conventional sprout suppression
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Klamath Basin Research and Extension Center
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Research in the Klamath Basin
20 07 Annual Report
products is planned for 2008. POR02PG12-1 has generated much interest by one of the
large processing companies in North America and will continue to be evaluated for both
fresh and processed usage in the Statewide Specialty trial at KBREC in 2008.
Statewide Yield Trial
All entries achieved excellent stands (Table 3). Vine maturity for all entries was
earlier than All Blue and slightly later than Yukon Gold. Skin and flesh color were
comprised mostly of red-red and purple-purple with the exception of POR03PG23-1,
POR04PG01-2, and POR04PG03-9 which had multiple skin and flesh color
combinations. POR03PG12-2 and POR03PG80-2 are fingerling types with all other
entries being mostly round in tuber shape. Vascular discoloration and stem-end
browning has been a noted weakness for several red and purple-fleshed cultivars in past
years evaluation. Not surprisingly, the 3 entries with the highest percentage of vascular
discoloration and stem-end browning are red and purple-fleshed, those being:
POR03PG12-2, POR03PG23-1, and POR03PG80-2. Yield results for the standard
varieties were significantly higher than those observed for the Preliminary Yield trial
(Table 4). The likely scenario can be attributed to an increase in replication and
improved stands. Yields and tuber size distribution ranged widely. POR03PG80-2 and
Yukon Gold had the largest tuber size profile with 198 and 96 cwt/a over 10 oz
respectively. Most all other entries had less yield of U.S. No. 1’s compared to Yukon
Gold; however, yield of tubers less than 4 oz were significantly higher. PA96RR1-193,
POR01PG45-5, and POR03PG23-1 advance to the Western Regional Red/Specialty
Yield trial in 2008. Other selections retained will remain in the Statewide Yield trial for
another year before their disposition is determined.
Regional Red-skinned/Specialty Trial
Increased interest from both fresh market and processing sectors for new redskinned and specialty-type potato cultivars is reflected by the number of entries in the
Regional Red/Specialty trial. However, with such a wide array of skin and flesh color
combinations and relatively few standard varieties to use for comparison purposes it was
decided to allow entries to graduate this trial with only 2 years of evaluation. In addition,
it was decided to limit the number of entries per breeding institution to no more than 3
selections per year. Therefore, 9 selections graduate from this trial in 2007. Release
decisions for graduating selections will be determined by the sponsoring states. Plans to
release POR01PG20-12, POR01PG22-1, and POR01PG16-1 will be initiated by OSU as
a Tri-state release in 2008. POR00PG4-1 was dropped from further evaluation due to
excessive growth crack problems (Table 6). POR02PG5-1 was also dropped for various
reasons from further evaluation. All entries achieved excellent final stands (Table 5).
Vine maturities ranged from very early for POR02PG37-2 to very late for POR01PG161. Skin russeting is a serious defect for specialty-type potatoes. It is not uncommon to
see this and other skin defects comprise the majority of cullage at fresh pack facilities.
Therefore, skin finish is an extremely important selection criterion. Entries exhibiting
excessive russeting were CO97222-1R/R, CO97226-2R/R, POR02PG5-1, and A965104Y (Table 6). Other entries showing a propensity for skin bronzing (data not shown) are
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Klamath Basin Research and Extension Center
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Research in the Klamath Basin
20 07 Annual Report
AC97521-1R/Y, CO97232-1R/Y, CO97232-2R/Y, CO97222-1R/R, CO97226-2R/R, All
Blue, CO97215-2P/P, CO97227-2P/PW, and POR01PG16-1. Yields and tuber size
distribution varied widely (Table 7). POR01PG22-1, a red-skinned red-fleshed fingerling
selection, led all entries in yield of tubers less than 4 oz. with 430 cwt/a. POR02PG5-1
led all entries in yield of tuber greater than 10 oz. with 260 cwt/a. As expected, trials
with such variation in maturity and tuber shape are difficult to manage. Therefore, clones
nearing release will be evaluated in greater detail to optimize plant populations and other
cultural management practices prior to wide-scale production.
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Research in the Klamath Basin
20 07 Annual Report
Table 1. Plant and tuber characteristics of potato entries selected in the Red/Specialty Preliminary Yield Trial grown
at the Klamath Basin Research and Extension Center, Klamath Falls, OR, 2007.
Variety or
Percent
Vine
selection
stand
maturity1
Yukon Gold
All Blue
88
100
OR04036-5
OR04036-7
OR04131-2
Tuber characteristics2
skin color
flesh color
3.0
4.0
Yellow
Purple
Yellow
Purple
2.5
5.0
4.3
3.3
2.0
4.3
4.0
2.5
100
100
100
3.0
2.0
1.0
Yellow
Yellow
Red
Yellow
Yellow
Red
3.0
1.0
1.0
4.3
4.0
4.3
4.0
1.3
1.0
4.5
3.8
4.5
OR04198-1
PORO5PG10-1
PORO5PG26-11
100
100
100
3.3
1.3
2.3
Yellow
Yellow
Yellow
Yellow
Yellow
Yellow
5.0
4.5
3.5
3.8
3.3
4.0
1.0
1.0
2.5
4.3
4.8
4.0
PORO5PG56-1
POR02PG12-1
POR04PG11-2
100
95
100
1.8
1.5
3.0
Purple
Purple
Yellow
Yellow
Purple/Yellow Purple/Yellow
4.0
1.5
3.0
4.0
4.5
3.8
3.0
1.0
1.8
4.3
4.8
4.0
Mean
98
2.4
----
3.1
3.9
2.1
4.1
1/
2/
----
flesh Intensity eyes shape uniformity
Vine maturity rating: 1 = early; 5 = late.
Skin color: 1 = light; 5 = dark.
Flesh color: 1 = light; 5 = dark.
Flesh intensity: 1 = light; 5 = dark.
Eyes: 1 = deep; 5 = shallow.
Shape: 1 = round; 2 = oval; 3 = oblong, 4 = blocky, 5 = long.
Uniformity: 1 = poor; 5 = excellent.
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Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 17
Research in the Klamath Basin
20 07 Annual Report
Table 2. Tuber yield by grade and specific gravity of potato entries selected in the Specialty Preliminary Yield
Trial grown at the Klamath Basin Research and Extension Center, Klamath Falls, OR, 2007.
Variety or
selection
4-6 oz
Yield U.S. No. 1s
6-10 oz >10 oz
Yield
total
Specific
<4 oz
culls
total
gravity
cwt/acre
Yukon Gold
All Blue
41
58
85
56
145
8
272
122
17
97
15
29
304
248
1.091
1.089
OR04036-5
OR04036-7
OR04131-2
140
91
82
130
104
19
65
20
3
335
214
105
68
85
212
19
11
3
422
310
320
1.069
1.069
1.078
OR04198-1
PORO5PG10-1
86
4
56
0
10
0
152
4
105
226
9
0
267
230
1.083
1.088
PORO5PG26-11
133
106
11
249
147
8
405
1.088
PORO5PG56-1
POR02PG12-1
POR04PG11-2
145
0
58
56
0
21
3
0
0
204
0
80
244
146
146
9
6
10
457
152
235
1.083
1.082
1.093
Mean
76
58
24
158
136
11
304
1.083
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20 07 Annual Report
Table 3. Plant and tuber characteristics of potato entries in the Oregon Statewide Specialty Trial grown at the Klamath
Basin Research and Extension Center, Klamath Falls, OR, 2007.
Tuber characteristics2
Variety or
Percent
Vine
selection
stand
maturity1
Yukon Gold
All Blue
99
100
2.0
3.1
Yellow
Purple
3.0
4.8
Yellow
Purple
2.5
4.8
4.3
2.6
1.9
4.1
3.9
2.9
99
99
99
1.8
2.6
2.6
Red
Purple
Purple
3.6
2.4
4.9
Red
Purple
Purple
2.0
2.0
4.5
4.1
4.3
4.0
1.0
2.4
2.0
4.6
4.0
4.0
POR03PG231*
POR03PG80-
100
1.9
Purple
4.9
Purple
4.0
4.3
3.8
3.3
99
2.4
Red/Yellow
3.5
Red/Yellow
3.5
4.1
1.4
4.0
2*
98
2.5
Purple
2.8
Purple
2.8
4.0
4.3
4.3
POR04PG012*
POR04PG03-
100
2.5
Purple/Yellow
3.9
Purple/Yellow
2.0
3.5
1.9
3.8
9*
100
2.8
Red/Yellow
2.4
Red/Yellow
1.5
4.1
1.0
4.3
POR04PG39-2
100
2.5
Red
3.3
Red
2.0
4.0
3.0
2.9
Mean
CV(%)
LSD (0.05)
99
-------
2.4
-------
2.9
-------
3.9
-------
2.4
-------
3.8
-------
PA96RR1193*
POR01PG455*
OR00068-11
skin color
skin intensity flesh color
flesh intensity eyes shape uniformity
POR03PG12-2
----------
3.6
-------
----------
1/
Vine maturity rating: 1 = early; 5 = late.
Skin intensity: 1 = light; 5 = dark.
Flesh intensity: 1 = light; 5 = dark.
Eyes: 1 = deep; 5 = shallow.
Shape: 1 = round; 5 = long.
Size/shape uniformity: 1 = poor; 5 = excellent.
*Retained for further evaluation
2
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Table 4. Tuber characteristics of potato entries in the Oregon Statewide Specialty Trial grown at the Klamath Basin
Research and Extension Center, Klamath Falls, OR, 2007.
Variety or
selection
Growth
1
Greening
1
cracks
Vascular
Rhizoc
1
2
Stem
3
Corky
3
Russeting discoloration end browning
ring spot3
Yukon Gold
All Blue
4.1
4.8
4.5
4.6
5.0
4.4
1.5
2.6
0
20
%
13
18
PA96RR1-193*
POR01PG45-5*
OR00068-11
5.0
4.6
4.8
5.0
4.9
5.0
4.3
4.3
3.8
2.0
1.6
2.0
5
3
3
13
18
8
13
18
0
POR03PG12-2
POR03PG23-1*
POR03PG80-2*
5.0
4.3
4.9
5.0
5.0
5.0
4.8
4.0
5.0
1.6
2.6
1.5
18
13
13
18
23
15
0
8
0
POR04PG01-2*
POR04PG03-9*
POR04PG39-2
4.8
4.5
4.5
4.6
5.0
1.0
4.9
4.6
4.4
1.5
1.3
2.6
0
5
5
0
13
8
18
5
13
Mean
CV(%)
4.6
----
4.5
----
4.5
----
1.9
----
7.5
200.1
13.0
74.6
8.6
161.8
LSD (0.05)
----
----
----
----
NS
NS
NS
18
5
1/
Greening, growth cracks, rhizoc: 1 = severe; 5 = none.
Russeting: 1 = light; 5 = heavy.
3/
Percent in 10 large tuber sample
*Retained for further evaluation
2/
______________________________________________________________________________
Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 20
Research in the Klamath Basin
20 07 Annual Report
Table 5. Tuber yield by grade and specific gravity of potato entries in the Oregon Statewide Specialty Trial grown at
the Klamath Basin Research and Extension Center, Klamath Falls, OR, 2007.
Variety or
selection
4-6 oz
Yield U.S. No. 1s
6-10 oz >10 oz
Yield
total
Specific
<4 oz
culls
total
1
gravity rank
cwt/acre
Yukon Gold
All Blue
97
108
150
106
96
28
343
242
34
153
63
77
440
472
1.093
1.089
3
7
PA96RR1-193*
POR01PG45-5*
OR00068-11
182
133
159
61
130
89
5
19
14
248
281
262
264
128
152
11
33
42
524
442
455
1.090
1.088
1.095
6
4
5
POR03PG12-2
POR03PG23-1*
POR03PG80-2*
92
118
62
100
40
192
25
5
198
217
164
451
94
216
18
56
32
49
367
413
519
1.091
1.073
1.077
8
10
1
POR04PG01-2*
POR04PG03-9*
POR04PG39-2
150
146
50
169
62
48
27
4
16
346
212
115
120
209
38
18
27
299
484
448
452
1.091
1.082
1.080
2
9
11
Mean
CV (%)
LSD (0.05)
118
21
35
104
30
45
40
65
37
262
20
76
130
18
34
64
29
27
456
14
94
1.086
0.200
0.003
----------
1
Rank: ranking in total U.S. No. 1 yield for KES out of 11 entries.
*Retained for further evaluation
______________________________________________________________________________
Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 21
Research in the Klamath Basin
20 07 Annual Report
Table 6. Plant and tuber characteristics of potato entries in the Western Regional Specialty Trial grown at the
Klamath Basin Research and Extension Center, Klamath Falls, OR, 2007.
Tuber characteristics2
Variety or
Percent
Vine
selection
stand
maturity1
Red/White Flesh
Dk Red Norland
Red LaSoda
CO98012-5R
NDA7985-1R
99
100
99
100
2.1
2.3
2.3
2.9
1.9
1.8
3.8
3.3
Red/Yellow Flesh
AC97521-1R/Y
ATTX961014-1R/Y
ATTX98500-2P/Y
CO97232-1R/Y
CO97232-2R/Y
CO97233-3R/Y
POR00PG4-1
99
100
98
100
100
96
99
2.8
2.1
3.3
1.9
1.6
3.6
1.9
Red/Red Flesh
CO97222-1R/R
CO97226-2R/R
POR01PG20-12
POR01PG22-1
POR02PG5-1
98
99
100
99
100
Purple/Purple Flesh
All Blue
CO97215-2P/P
CO97227-2P/PW
POR01PG16-1
skin intensity flesh intensity
eyes
shape
uniformity
1.1
1.5
1.3
1.3
3.9
1.9
4.1
4.0
1.9
1.8
1.4
1.8
4.1
2.9
4.5
3.0
1.8
2.9
4.5
2.4
1.9
3.0
2.6
3.1
2.5
3.4
3.4
3.3
3.1
3.9
4.5
4.1
3.9
4.3
4.0
4.5
3.8
2.1
1.9
1.4
2.6
1.9
2.9
2.5
3.8
3.9
3.9
3.8
3.8
2.4
1.9
2.8
3.1
3.6
3.6
4.6
4.5
4.4
3.1
4.0
2.4
4.8
4.8
4.1
4.1
3.8
3.6
4.0
3.9
4.5
3.6
2.4
1.3
3.6
5.0
1.9
3.6
4.3
3.5
4.8
4.1
100
99
100
96
3.1
3.5
2.4
2.9
4.6
5.0
5.0
4.8
5.0
5.0
5.0
5.0
3.0
4.3
3.9
4.0
4.5
1.4
3.4
4.9
3.6
4.5
3.5
3.6
Yellow Flesh
Yukon Gold
A96510-4Y
POR02PG26-5
POR02PG37-2
99
100
99
98
2.0
4.1
2.4
1.1
3.4
2.6
3.0
3.0
2.6
2.3
2.6
3.3
4.4
4.0
4.1
4.3
1.8
3.4
1.8
2.3
3.9
2.5
4.1
4.4
Mean
99
2.7
3.3
3.3
3.9
2.5
3.7
1/
Vine maturity rating: 1 = early; 5 = late.
Skin intensity: 1 = light; 5 = dark.
Flesh intensity: 1 = light; 5 = dark.
Eyes: 1 = deep; 5 = shallow.
Shape: 1 = round; 5 = long.
Size/shape uniformity: 1 = poor; 5 = excellent.
*Retained for further evaluation
2/
______________________________________________________________________________
Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 22
Research in the Klamath Basin
20 07 Annual Report
Table 7. Tuber characteristics of potato entries in the Western Regional Specialty Trial grown at the Klamath Basin
Research and Extension Center, Klamath Falls, OR, 2007.
Variety or
selection
Growth
1
Greening
1
cracks
Vascular
Rhizoc
1
2
Russeting
Stem
3
discoloration
Corky
3
end browning
ring spot3
%
Red/White Flesh
Dk Red Norland
Red LaSoda
CO98012-5R
NDA7985-1R
4.8
4.8
5.0
4.9
4.8
5.0
4.5
4.8
4.8
4.6
4.3
4.5
2.6
1.6
1.8
1.5
3
8
5
3
0
0
3
5
40
20
35
0
Red/Yellow Flesh
AC97521-1R/Y
ATTX961014-1R/Y
ATTX98500-2P/Y
CO97232-1R/Y
CO97232-2R/Y
CO97233-3R/Y
POR00PG4-1
4.9
4.6
4.9
5.0
4.9
5.0
5.0
4.8
4.8
4.1
5.0
5.0
2.6
1.9
4.8
4.5
4.8
4.6
4.9
4.6
4.5
2.4
2.0
2.3
1.6
2.5
1.8
1.6
5
18
13
13
5
5
10
3
5
3
3
5
0
10
0
5
15
28
18
13
15
Red/Red Flesh
CO97222-1R/R
CO97226-2R/R
POR01PG20-12
POR01PG22-1
POR02PG5-1
4.5
5.0
4.4
5.0
4.6
4.5
4.8
4.0
5.0
5.0
4.5
5.0
4.8
3.5
5.0
3.0
3.5
1.5
1.5
3.8
23
83
18
0
0
25
0
13
18
10
40
0
18
0
18
Purple/Purple Flesh
All Blue
CO97215-2P/P
CO97227-2P/PW
POR01PG16-1
5.0
5.0
5.0
5.0
4.4
4.0
4.6
5.0
4.9
5.0
4.9
4.5
2.4
1.9
1.6
2.5
10
18
0
0
10
23
0
23
0
0
0
0
Yellow Flesh
Yukon Gold
A96510-4Y
POR02PG26-5
POR02PG37-2
4.0
4.1
4.4
4.4
4.3
3.8
5.0
5.0
5.0
5.0
3.5
5.0
1.8
3.6
2.0
1.8
3
0
15
10
8
0
0
3
15
28
15
10
Mean
CV (%)
LSD (0.05)
4.8
-------
4.4
-------
4.6
-------
2.2
-------
11
124
19
7
156
15
14
141
27
1/
Greening, growth cracks, rhizoc: 1 = severe; 5 = none.
Russeting: 1 = light; 5 = heavy.
3/
Percent in 10 large tuber sample
2/
______________________________________________________________________________
Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 23
Research in the Klamath Basin
20 07 Annual Report
Table 8. Tuber yield by grade and specific gravity of potato entries in the Western Regional Specialty Trial grown at
the Klamath Basin Research and Extension Center, Klamath Falls, OR, 2007.
Variety or
selection
4-6 oz
Yield U.S. No. 1s
6-10 oz >10 oz
Yield
total
Specific
<4 oz
culls
total
1
gravity rank
cwt/acre
Red/White Flesh
Dk Red Norland
Red LaSoda
CO98012-5R
NDA7985-1R
148
78
183
92
209
178
105
199
150
130
15
202
507
385
304
493
24
20
97
31
34
174
17
144
566
579
417
668
1.078
1.080
1.081
1.068
1
3
4
2
Red/Yellow Flesh
AC97521-1R/Y
ATTX961014-1R/Y
ATTX98500-2P/Y
CO97232-1R/Y
CO97232-2R/Y
CO97233-3R/Y
POR00PG4-1
164
162
164
172
156
91
29
188
230
190
111
177
109
53
108
126
86
33
64
59
18
460
518
440
316
398
259
100
62
78
65
140
50
41
48
102
43
69
40
51
252
232
624
639
574
495
499
553
380
1.087
1.082
1.081
1.083
1.077
1.086
1.080
2
1
3
5
4
6
7
Red/Red Flesh
CO97222-1R/R
CO97226-2R/R
POR01PG20-12
POR01PG22-1
POR02PG5-1
129
83
86
29
66
112
17
132
6
196
38
0
51
0
260
279
100
269
35
522
79
205
51
430
20
85
23
142
12
120
442
329
463
477
662
1.072
1.085
1.092
1.086
1.095
2
4
3
5
1
Purple/Purple Flesh
All Blue
CO97215-2P/P
CO97227-2P/PW
POR01PG16-1
145
121
127
52
117
41
72
12
28
3
10
0
290
166
208
64
147
156
257
177
54
37
52
76
492
359
518
317
1.089
1.094
1.091
1.081
1
4
2
3
Yellow Flesh
Yukon Gold
A96510-4Y
POR02PG26-5
POR02PG37-2
92
37
185
187
138
141
179
130
160
217
78
20
390
395
442
336
33
19
83
102
58
207
64
35
481
621
590
474
1.092
1.091
1.081
1.088
3
2
1
4
Mean
CV (%)
LSD (0.05)
116
31
51
127
35
62
77
42
46
320
21
95
101
37
52
89
51
64
509
13
96
1.084
0.385
0.006
----------
1/
Rank: ranking in total U.S. No. 1 yield for KBREC of enteries within different flesh color categories.
______________________________________________________________________________
Klamath Basin Research and Extension Center
Red-skinned and Specialty Potato Variety Development, 2007 Page 24