parents namely Tr and Triveni and four susceptible high yielding popular strains viz., IR 36. IR 50, TKM 9 and CO 44 were chosen for crossing work. Seven crosses were effected and hybrids were raised along with their respective parents, Quantitative characters Viz.. plant height, number of productive tillers, panicle length, number of spikelets per panicle, 100 grains weight and grain yield per plant were recorded and studied. Four crosses viz.. IR 50x T7, T7x TKM 9, Triveni x TKM 9 and Triveni x IR 36 expressed heterosis for the six yield contributing characters studied. In cross combinations viz, Triveni x TKM 9 and T7 x TKM9. study was undertaken in F, generation for the segregating pattern of apiculus pigmentation in spikelets. Apiculus pigmentation has been found to be complementary gene action.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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