Heterosis for grain yield and its component characters in upland rice (Oryza sativa L.)

Fifteen crosses were generated by crossing between five lines and three testers in L x T mating design. Crosses were evaluated along with parents and standard check (VANDANA) to studying the heterosis for twelve quantitative characters. Analysis of variance for all quantitative characters studied, revealed significant differences, indicating the presence of adequate genetic variability among the crosses and their parents. The maximum relative heterosis and heterobeltiosis for grain yield per plant recorded for IR74371-54-1-1/IR67017-124-2-4. The maximum standard heterosis for grain yield was exhibited by IR 81413-B-B-75-4/IR 81429-B-31 (179.95 per cent). On the basis of sca effect, seven crosses were identified for high grain yield per plant. These crosses may be gives the better segregates from the early segregating generation or can be utilized for heterosis breeding for yield improvement under rainfed condition.