A study on heterosis in rice (Oryza sativa L.)

Abstract

Heterosis for yield and four yield components, viz. panicle number per plant, panicle length, spikelet per panicle and lOOO-grain weight, was studied in fifteen crosses involving six varieties of rice, Uryza sutiva L. Positive and significant heterosis for yield was observed in 11 and 8 crosses, over the midparent and the better parent, respectively. Hamsa x Hybrid 27 gave the highest heterosis both over the mid-parent (156.23 %) and the better parent (136.38%) followed by Jaya x Norin 18 with respective values of 155.18 and 56.29%.As compared with the average yield of 36.54 g per plant of the high yielding commercial variety, viz.

Yield of F1, F2 and F3 hybrids of rice (Oryza sativa L.)

“…In 11 of 15 crosses grown at 40 × 30 cm spacings SAINI et al (1974) observed midparent heterosis for grain yield, and high parent heterosis in 8 of 15 crosses. Yield heterosis was due to simultaneous heterosis for a number of yield components.…”