| Summary: | Forty five mutant lines developed using gamma rays and electron beam irradiation in the background of ADT 37 and ADT
(R) 45 were characterized for twenty four DUS characters. Out of the twelve visually assessed qualitative traits, shape of
ligule, colour of ligule, stigma colour, sterile lemma colour, panicle secondary branching and panicle attitude were
monomorphic, culm attitude, panicle exertion, flag leaf attitude, presence of awns and distribution of awns were dimorphic
and the grain shape was polymorphic. The analysis of variance revealed the existence of significant differences among
genotypes for six characters viz., days to 50% flowering, plant height, number of productive tillers, number of filled grains
per panicle, single plant yield and panicle length. The traits viz., number of productive tillers, number of filled grains per
panicle, 1000 grain weight, leaf blade width, LB ratio and single plant yield had high heritability along with genetic advance
as percent of mean. These characters are governed by additive gene action and improvement in these characters would be
possible through direct selection. The diversity analysis of both qualitative and quantitative characters grouped the mutant
lines into seven clusters. Among the seven clusters, the maximum number of genotypes (27) present in cluster IV. The intra
cluster distance was maximum in cluster I and the highest inter-cluster distance was recorded between cluster I and cluster
VI. Five mutant lines viz., M6, M66, M79, M85 and M88 of ADT (R) 45 were identified as desirable lines based on nonlodging
habit and increase in 1000 grain weight and six mutant lines viz., M69, M71, M78, M79, M85 and M88 of ADT 37
with medium slender grain type were selected as novel mutants. These selected lines will be promoted to yield trials. Two
unique mutant lines M 37 and M 39 of ADT (R) 45 with distinct culm and flag leaf attitude were selected as desirable
mutants and these will be registered under PPV&FR Act for obtaining plant breeder’s rights.
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