Madras Agricultural Journal
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HETEROSIS IN INDUCED SEMI-DWARF MUTANTS OF RICE

Abstract

                                Heterotic potential in twenty one cross combinations was studied in rice for grain yield and important yield components. Seven crosses exhibited significant heterosis over the respective better parents and ten crosses over the standard variety, IR. 50 for grain yield per plant. Among hybrid combinations CO 29 10+25 KR x T(N) 1 exhibited maximum standard heterosis (169%) for grain yield, M 102 x IR 50 for 100 grain weight (41%), M 210 x IR 50 for number of grains per panicle (104%), TKM 6 x IR 50 for number of productive tillers per plant (45%) and M 6 x TKM 9 for plant height (-5%).

Key words : Heterosis, mutants, Rice

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