EFFECT OF GAMMA IRRADIATION ON FEW IMPORTANT TRAITS OF SELECTED INBREDS OF SUNFLOWER (Helianthus annuus L.)
Loading...
Date
2011-07-30
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES, RAICHUR
Abstract
In sunflower most of the popular hybrids released are very high yielding but they are associated with some of the undesirable traits like tallness, late in flowering and maturity, very large head size which leads to set large sized seeds with small kernels inside, low test weight, low oil content etc. which are all polygenic in nature. The present study aimed at improving such characters without altering genetic background of a
genotype and creating variability anew by administering the mutagen in parents of the hybrids. The base material for the present study comprised of both the parental (B and R) lines of popular sunflower hybrid RSFH-130 hybrids (CMS-104B and R630), and maintainer lines of RFSH-1hybrid (CMS-103B) and KBSH-44hybrid (CMS-17B). Seeds of these genotypes were irradiated at 10, 15 and 20 kR doses of gamma rays.
The study in M1 and M2 generations revealed that in all the genotypes, there was a dose dependent decrease in germination and survival. The dose 20 kR was found to be more deleterious in reducing the germination and survival. In general frequency of chlorophyll mutations increased with increase in dose, in all the genotypes, with the highest frequency at 20 kR dose. Effectiveness and efficiency of gamma rays on mutations induced was in general, directly proportional to the dose applied. Maximum effectiveness was observed at 20kR dose in all the genotypes. Among the different gamma irradiation doses, viz., 10, 15 and 20 kR, the highest dose of 20 kR was most efficient dose, in increasing the range, genetic variability, heritability, genetic advance and genotypic coefficient of variation for all the economic traits studied in all the four genotypes.
Description
Keywords
Citation
150