Author(s):

S Muthuramu and T Ragavan

Abstract: The study was conducted during Rabi 2019-20 under rainfed rice ecosystem to investigate genetic variation, heritability and interrelationship of yield and related attributes in F3 populations of crosses RMD 1 x Poongar and ASD 16 x Poongar. Maximum standard deviation recorded for number of filled grains per panicle in both crosses. The higher magnitude of PCV and GCV were registered for number of productive tillers per plant in both crosses. High heritability coupled with high genetic advance was recorded for number of filled grains per panicle and straw yield in cross RMD 1 x Poongar and number of filled grains per panicle, straw yield and harvest index in cross ASD 16 x Poongar. The distribution of frequency for spikelet fertility was negatively skewed and platykurtic in the both crosses. Single plant yield exhibited positive and significant association with panicle length and harvest index in cross RMD 1 x Poongar and harvest index only in cross ASD 16 x Poongar. Straw yield and harvest index expressed very high direct effect on single plant yield in RMD 1 x Poongar and harvest index had very high direct effect on single plant yield in ASD 16 x Poongar and hence simultaneous selection for these traits can significantly improve the single plant yield in rainfed rice ecosystem.

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