PLS221 Capsicum Foto del: The Chile Pepper Institute, NMSU, http://spectre.nmsu.edu/dept/welcome.html ?t=CHILE Spooner et al 2008 Origin & domestication C. annuum C. baccatum C. pubescens C. frutescens C. chinense C. annuum m (var. glabriusculum) chacoense galapagence X=13 Moscone at al 2007 Specific traits C. annuum C. chinense C. frutescens The Chile Pepper Institute, NMSU, http://spectre.nmsu.edu/dept/welcome. html?t=CHILE C. baccatum C. pubescens Rocoto, locoto, chile manzano Wild species related to C. pubescens C. eximium & C. cardenasii C. cardenasii Wild species C. tovari C. spp Capsicum galapagoense Genetic Diversity of Chiltepins Variety Clasificacion Non-pungent (sweet): Bell pepper, pimento, paprika, yellow wax 2x acreage than hot peppers Hot peppers (pungent): NewMex type (‘Anaheim’, ‘Largo Verde’), jalapeño, ancho, serrano, Tabasco, habanero etc Paprika in USA is a product: chile powder from nonpungent NewMex types In Europe it is a variety, in Hungary are sweet and hot paprika Bosland et al. 1996. Capsicum pepper varieties and classification <www.geocities.com/NapaValley/3378/circ530.pdf > Bosland et al. 1996. Capsicum pepper varieties and classification <www.geocities.com/NapaValley/3378/circ530.pdf > Genes controlling main traits of Capsicums > 292 described genes for: Morphology, Physiology, Sterility Disease and pest resistance Wang D & P Bosland (2006) HortScience 41:1169-1187 Pepper Trisomics Capsicum linkage maps, 2262 markers Paran et al Mol. Breed. 13:251-61 Sample of important genes Plant height: dwafs: dw-1, dw-2, dw-3, dw-4, dw-5, dw-6, dw-7, dw-8 Tall: tal Leaf shape : ~31 genes Flowers: Multiple Flowers: Mf-1, Mf-2, Mf-3 Fruit shape: 6 genes: O round; up-1, up2, upright; pf parthenocarpy Immature fruit color: sw1 sulfur white; sw2 yellow-green; sw3 light green, A & MoA, F purple Mature fruit color y cl c1 c2 Y Y Y Y Y y y y y y Cl Cl Cl Cl cl Cl Cl Cl Cl cl C1 C2 red c1 C2 light rrd C1 c2 orange c1 c2 light orange C1 C2 chocolate C1 C2 yellow c1 C2 light yellow C1 c2 lemon yellow c1 c2 white - - olive green Molecular basis Y (Ccs) capsanthin y capsorubin synthase, y= zeaxanthin chrom 6 C2: (phytoene synthase), chrom 4 cl: clorophyll retention Unknown function chrom 1 Heat or Pungency: capsaicinoid alkaloids Most abundant: Capsaicin & Dihydrocapsaicin Type Habanero Tabasco Thai Hot Jalapeño Amarillo Serrano Bell species C. chinense C. frutescens C. annuum C. annuum C. baccatum C. annuum C. annuum Scoville units 210,000 120,000 60,000 25,000 17,000 4,000 0 Guiness record: Bhut Jolokia de la India, con 1,001,304 US, http://www.nmsu.edu/~ucomm/Releases/2007/february/hottest_chile.htm Capsaicinoid synthesis Steward et al. Plant J. 2005 The Known Capsaicinoids *Capsaicin *Homocapsaicin *Norcapsaicin Nornorcapsaicin Bis-homocapsaicin Tris-homocapsaicin Tetra-homocapsaicin The Known Capsaicinoids *Dihydrocapsaicin *Homodihydrocapsaicin Nordihydrocapsaicin Nornordihydrocapsaicin 3-nor-dihydrocapsaicin Tris-homodihydrocapsaicin Bis-homodihydrocapsaicin Tetra-homodihydrocapsaicin The Known Capsaicinoids Isomers of Dihydrocapsaicin Tetra-homodihydrocapsaicin Tris-homodihydrocapsaicin Nordihydrocapsaicin Nornordihydrocapsaicin SB2-66, candidate gene Pun1 J. 42:675-688 SB2-66 sequence colocalized with Pun1 in F2 mapping pop C. frutescens BG 2816 (Pun1/Pun1) x C. annum ‘Maor’ (pun1/pun1) Mapped on chromosome 2 DNA seq variation between sween and hot varieties Stewart et al., 2005, The Plant Genomic DNA Sequence and structure of Pun1 locus Acyltransferase Deletion of 25Kb in sweet types (recessive) of C. annuum 6 QTL control amount of capsaicinoids Ben-Chaim et al Fruit shape and size Zygier et al., 2005 Theor Appl Genet 111:437-445 Ben Chaim et al. 2003b Theor Appl. Genet 106:889-894 Conservation of QTL on chrom 2 & 4 in Capsicum (3 species) & tomato QTL for fruit size (3) fw2.1 (major effect), fw-4.1 y fw4.2 Same locations as tomato QTL for fruit shape (6) fs3.1 y fs10.1 (major effects) not conserved in tomato fs2.1 (minor effect), associated to fw2.1 fs4.1 y fs4.2 (minor effects) associated with fw.4.1 & fw4.2 respectively. fs8.1 (minor effect) Nematode resistence (Meloidogyne spp) Djian-Caporalino et al 2007. Theor Appl Genet 114:473-486 6 resistance genes on chrom 9 Me1, Me3 & Me 7 wide spectrum, plus N Marker assisted selection for nematode resistance Virus Resistence TMV: gene L (or Tm), multiple alleles CMV: gene cm, plus 7 QTL restrict virus movement Caranta et al 2002 Theor Appl Genet 104:586-591 Potyvirus (PVY, TEV Pep-moV, PVMV, CVMV, PVE) Genes prv-1, prv-3,prv-5, pvr-6, prv8 (recessive) , Prv-4, Pvr-7, Pn-1 (dominant) Markers available for prv-1, chromos 3 Yeam et al 2005. Theor Appl Genet 112:178-86 TSWS (tomato spotted wilt topovirus) Gene Tsw, marker available, chrom 10 Resistance to other diseases Bacterial spot (Xanthomonas) Genes Bs-1, Bs-2, Bs-3, Bs-4 , Xcv (dominant) Bs-5, bs-6, gds (recessive) Markers available for Bs-2,Bs-3 Phytophtora Gene Psr, Pfr 6 QTL: Phyto4.1,5.1, 5.2, 6.1, 11.1, 12.1 Antracnosis: genes Anr-1 al -5. Oidium: genes lmr-1 al 3 , + 7 QTL Cytoplasmic male sterility 2006. Breeding Sci 56:331-4 Gulyas et al C. annuum rf in cytoplasm S Restorer Rf Markers distinguishing sterile and fertile plants Pepper cms Kim & Kim 2005 Fruit taste and aroma Very little know on inheritance of compounds determining these traits Specific flavor Bell-pepper (2-isobutyl 3 methoxypyrazine, decadienal) habanero, jalapeño, baccatum yellow pepper? Species specific? Changes during fruit maturation? baccatum (yellow) chinense (habanero) annuum (jalapeño) Negre & Quiros,unpub # Compound Jalapeño (C. annuum) Habanero (C. chinense) Amarillo (C. baccatum) x 1 Hexyl 2-methylbutanoate x x 2 a-himachalene x x 3 3-methylbutyl 3-methylbutanoate x x 4 Hexyl 2-methylpropanoate x x 5 cis-3-hexenyl 3-methylbutanoate x x 6 Hexyl 3-methylbutanoate x x 7 Hexylhexanoate x x 8 b-cubebene cis-b-ocimene x x 9 x 10 Isocaryophyllene x 11 b-himachalene x 12 4-methylpentanol x 13 cis-3-hexenol x 14 Hexanol x 15 Heptanol x 16 5-methyl 6-heptenol x 17 Pentyl 3-methylbutanoate x 18 3,5-dimethylcyclohexene x 19 2,2-dimethylheptylpropanoate x 20 2-methylheptylbutanoate x 21 3,3-dimethylcyclohexanol x 22 Octyl 3-methylbutanoate x 23 cis-5-octenol x + 12 others specific to yellow Doubled Haploides Available to Capsicum breeder Allows to obtain homozygous lines, including RI. Twin seedlings (traditional) Anther culture Transgenesis Agrobacterium transformation difficult in Capsicum annuum Dificulties: 1) Shoot regeneration is genotype dependent 2) Low efficiency of infection by Agrobacterium in cot/hypocots Virus resistence obtained experimentally Lee et al (2004) Plant Cell Rept 23:50-58 Celestial smile The Chile Pepper Institute, NMSU, http://spectre.nmsu.edu/dept/welcome.html?t=CHILE