Plant Breeding & Genetics
Title
:
Name of the student
Guide
Degree
Year
Key words
:
:
:
:
:
Genetic and Biochemical Basis of Aroma in
Traditionally Grown Land Races of Rice in
Kashmir Valley
Sabina Nasseer
Dr. Gul Zaffar
PhD
2007
Aroma, Characterization, Inheritance, Isozymes,
Oryza sativa
ABSTRACT
Four aromatic landraces viz. Mushkbudji, Kamad, Laer Beoul and Black rice and two
non aromatic varieties were analyzed for morphological characteristics, variation at the isozyme
level and genetics of aroma. Based on the morphological characters of the plant, rice genotypes
could be classified into various categories; the genotypes could be grouped into two i.e. good and
very good on the basis of early plant vigour, two classes on the basis of coleoptile colour i.e.
green and purple, three classes on the basis of basal leaf sheath colour viz. green, light purple and
purple lines, three classes on the basis of leaf blade colour i.e. light green, green and dark green,
three classes on the basis of leaf pubescence viz. intermediate, glabrous and pubescent, three
classes on the basis of panicle type i.e. open, intermediate and compact and three classes on the
basis of threshability i.e. easy, intermediate and difficult. Panicle length varied from 23.75 cm to
27.05 cm with minimum length in Mushkbudji and maximum length in Kamad.
The rice varieties fell into three broad seed colour groups viz. white, creamy white and
yellowish white and four groups on the basis of hull colour viz. yellow, light yellow, black and
light yellow with streaks.
Based on the inheritance pattern of aroma, 3:1 Mendelian ratio was observed in the cross
of Black rice with Jhelum (SKAU 27) and Kamad with Chenab (SKAU 23). Complementary
gene action (9:7 ratio) was observed in cross of black rice with Chenab and Mushkbudji with
Jhelum whereas a ratio of 27:37 was found in Mushkbudji x Chenab indicating involvement of 3
dominant aroma genes. Duplicate gene action (15:1 ratio) was observed in Laer Beoul x Jhelum
and Laer Beoul x Chenab. Only one cross between Kamad x Jhelum showed a ratio of 13:3.
Electrophoretic banding pattern of isozymes proved to be reliable in characterizing the aromatic
land races from non-aromatic varieties. The analysis of peroxidase and malate dehydrogenase
isozymes enabled the differentiation of the two groups of varieties on the basis of presence or
absence of a particular band.
-o-