PJB-2017-654
ASSESSMENT OF GENETIC VARIABILITY FOR SHORT DURATION AND HIGH YIELDING NERICA RICE MUTANT LINES
MAHMUDUL HASSAN NAFIS
Abstract
Seven M3 mutants derived from irradiating the seed of NERICA-10 with carbon ion beam were grown in the experimental farm of BINA, Mymensingh, Bangladesh to select the best performing mutant based on short duration and higher yield. All of the mutants were mature earlier(106 days) compared to its parents, NERICA 10 (127 days). Plant height of mutants (80.4 to 87.4 cm) were less than its parents (94.07cm). Average panicle length ranged from 21.4 and 22.33 cm for mutants 24.87 cm for parent. The number of effective tillers plants-1 and filled grain percentage for mutants and its parents were 6.8 to 9.47 and 66-82% and 3.33 and 43% respectively. Thousand grain weight of mutants (22.53-23.20 g) were significantly lesser than their parent (29.25 g). All of the selected mutants were out yielding, the average yield plant-1 was 10.6 to 14 g, and their parent was 2.3 g. The genetic assessment revealed that much emphasis should be given on plant height, panicle length, filled grain and thousand grain weight which were the important traits for selection of mutants due to their closest genotypic and phenotypic coefficient of variation, high heritability (90-99.72%) and moderate genetic advance as per cent of mean. The first and second principal component accounted for 83% and 8% of total variance respectively. Among the mutants RM-N10-40(C)-1-5 produced highest yield plant-1(14.05 g) which was attributed to its shorter plant height, longer panicle length, higher number of filled grains and medium thousand grain weight. Thus, suggested mutation breeding is an effective approach for developing desirable varieties.
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