IDENTIFICATION OF TRANSGRESSIVE SEGREGANTS FOR YIELD AND INTROGRESSION OF LONG SLENDER GRAIN IN TO RICE (Oryza sativa L.) SUITABLE FOR AEROBIC CONDITIONS
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Date
2009-03-20
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University of Agricultural Sciences GKVK, Bangalore
Abstract
Rice (Oryza sativa L.) is the most water demanding crop and are largely grown
under irrigated conditions. Attempts to grow rice under aerobic conditions, which
demand less water, are quite successful elsewhere. However, the qualities of the grains
of the lines developed for aerobic conditions were of medium bold, thus hindering its
acceptability at the farmer’s level. Present investigation lays emphasis on identification
of transgressants for grain yield and fine-grain type in three segregating populations of
rice derived from the crosses viz., BI 43 x IRRI 49, BI 27 x IRRI 49 and BI 43 x IRRI 14
in the farmer’s field. All the characters exhibited wide variability in the segregating
generations. High PCV and GCV estimates, high heritability and high genetic advance as
per cent mean were recorded by number of tillers per plant, productive tillers per plant,
grains per panicle, per cent fertility, straw yield per plant and grain yield. Plant height,
number of tillers per plant, productive tillers per plant, L/B ratio, harvest index and straw
yield per plant manifested significant and positive association with grain yield in
segregating generations in all the three crosses. Path coefficient analysis revealed that
selection for characters viz., number of productive tiller per plant, harvest index and straw
yield per plant will be effective for obtaining high yielding lines as these characters
recorded high direct effect on grain yield in both F2 and F3 generations. High frequencies
of transgressants for grain yield and fine-grain type were recovered in both F2 and F3
generations. More number of transgressants were produced from BI 43 x IRRI 14
compared to other two crosses in F2 generations, while, BI 43 x IRRI 49 produced more
number of transgressants compared to the cross BI 27 x IRRI 49 in F3 generations.
Intergeneration correlation coefficients between F2 and F3 were positive and significant
for almost all the characters except for plant height and days to fifty per cent flowering
indicating additive gene action governing such characters. Hence, performance of the
plants in F2 generation is a reliable indicator of the performance of its progeny in
subsequent generations.
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