COMBINING ABILITY AND HETEROSIS IN SHORT DURATED BORO RICE THROUGH AUS X BORO CROSSING

Abstract

This research work was carried out by using number of F2 population of some intervarietal crosses of the species Oryza sdiliva in the experimental farm. Sher-e-Bangla Agricultural University (SAU). Dhaka during October 2011 to April 2012 for estimating the mean performance, combining ability (General and Specific) and residual heterosis. Combining ability analysis revealed significant general and specific combining ability for most of the traits studied indicating involvement of both additive and non-additive gene action in the inheritance of yield and yield contributing characters. Significant, desirable and highest SCA effect was observed for days to maturity in cross combination BR2I x BR24 which might be selected as the best specific combiner for earliness. Highest, significant desirable SCA effects was observed for yield and most of the yield contributing characters in cross combination BR26 x BRRI Dhan29 which might be selected as best specific cross combination followcd by BRRI Dhan28 x BRRI Dhan29, BR26 x BRRI Dhan36 and BR24 x 13R26 for yield and yield contributing characters. These cross combinations also showed heterosis and therefore these cross combinations may be reviewed fl.u-ther for earliness and yield performance. Mean performance revealed that, BR 21 x BRRI Dhan36 required minimum days to flowering and maturity with reasonable yield followed by BR 24 x BRRI Dhan 36. So, these two cross combination could be selected for short duration and high yielding variety development.