| dc.description.abstract | A field experiment was conducted using 32 advanced generation (F5) derived from eight
crosses during the period of Transplant Aman season from (July-December) of 2017, at
Plant Breeding Research Field, to assess the extent of variability, heritability, genetic
advance for yield and yield associated traits in rice. The experiment was laid down in a
randomized complete block design with three replications. A total of 13 characteristics
viz. plant height (cm), productive tillers/hill, (maximum vegetative stage), panicle length
(cm), fertile grains/panicle, sterile grains/panicle, panicle weight (g), sterility percentage
(%), lodging percentage (%), 1000-grain weight (g), grain yield/hill (g), days to 50%
flowering, days to maturity and harvest index were studied. Analysis of variance
indicated highly significant differences among the genotypes for all the traits under
study. The means of different traits were separated by DMRT. The advanced line, PL29
derived from Badshabhog × Begunbichi produced highest grain yield/ hill (17.56g) but
ranking of the advanced lines based on yield enhancing traits, 18 F5 derived from
Kalozira × Badshabhog showed the best performance. The PCV were higher than GCV
for all thirteen traits indicating that they all interacted with the environment to some
extent. High heritability was observed for fertile grains/panicle (97.80) followed by plant
height, productive tillers/hill, sterile grains/panicle, panicle length which indicates high
heritable portion of variation. High to medium estimates of heritability and genetic
advance value was recorded with fertile grains/panicle (37.82) followed by lodging
percentage (8.88), plant height (13.78) and 1000 grain weight (6.79) indicating the roles
of additive gene action and a good scope of selection using their phenotypic
performance. Correlation coefficients between grain yield per hill with panicle weight
and harvest index significant at 1% level of probability at both level and productive
tillers/hill (0.402) and panicle length (0.387) and 1000-grain weight (0.405) showed
positive association with grain yield at 5% level of probability at genotypic level,
suggested inherent association of these traits to increment grain yield in the advanced
lines. In the selection response, among the 32 genotypes PL29 showed highest grain
yield and 1000-grain weight compared to the previous generation. The simultaneous
character association both at genotypic and phenotypic level and genetic variability
panicle weight, fertile grains/panicle and 1000-grain weight along with the advanced
lines, PL29 may be included in further breeding to evolve super quality fine rice varieties
suitable for our country. | en_US |
