Heterosis studies for yield and yield components in rice (Oryza sativa L.)

Abstract

Heterosis in rice was studied for yield and its component traits in 25 F1s involving 10 parents comprised of 5 lines and\r5 testers. The high magnitude of heterosis for grain yield per plant is evident by significant superiority of crosses over\rmid parent and better parents in several crosses. The crosses viz., ADT37/ Nona bokra, ADT 37 /Pokkali, ADT 37 /\rFL478, ADT 42 /Pokkali , ADT47/CSR36 showed high relative heterosis and heterobeltiosis for grain yield per plant.\rThe crosses exhibiting good heterotic expression in F1 may be further studied to isolate superior transgressive segregants\rin later generations. The development of pure lines from segregating population is very important for evolving high\ryielding varieties.