Dus characterization and genetic variability studies of rice mutants
Abstract
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 non-lodging 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.
It is certified that:
- The corresponding author is fully responsible for any disputes arising due to the publication of his/her manuscript.
- The article has been seen by all the authors who are satisfied with its form and content.
- The sequence of names of authors in the by-line is as per their relative contribution to this experiment, giving due credit to all scientists who made notable contribution to it.
- All the authors fully understand that inclusion of any other co-authors or exclusion of any co-authors is not possible once the article has been submitted to the journal.
- The corresponding author takes full responsibility for this article.
- The address of the organization where the research was conducted is given.
- The article is exclusive for this journal, and the results reported here have not been sent (and will not be sent during its consideration by this journal) for publication in any other journal.
- Authors agree to abide by the objective comments of referees and do agree to modify the article into a short note as per the recommendation, for publication in the Electronic Journal of Plant Breeding.
- If published in Electronic Journal of Plant Breeding, the copyright of this article would vest with the Indian Society of Plant Breeders, who will have the right to enter into any agreement with any organization in India or abroad engaged in reprography, photocopying, storage and dissemination of information contained in it, and neither we nor our legal heirs will have any claims on royalty.
