Heterosis for yield and yield contributing traits in aromatic rice {oryza sativa l.)

Abstract

Abstract : Heterosis for yield and seven yield components, viz. plant height (cm), panicle number per plant (no.), panicle length (cm), grain length (mm), grain width (mm), fertile spikelet per plant (no.) and 1000-grain weight (g) was assessed in twenty crosses derived from nine varieties of aromatic rice at the experimental farm of the Department of Genetics and Plant Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur. In general, the hybrids performed significantly better than the respective parents. Both positive and negative heterosis over mid parent and better parent were observed for all the characters under test. In comparison of Fj hybrids with their respective mid parent and better parent showed significant heterosis for most of the characters except for grain width (mm). Among the 20 hybrids two cross combinations viz. Uknimadhu x Kataribhog and Uknimadhu x Badshahbhog exhibited the highest estimates of both mid and better parent heterosis for grain yield/hill (g) followed by Uknimadhu x Rajbhog.