Abstract

                                Twenty five aromatic rice hybrids developed by line x tester mating design involving 8 scented and 2 non-scented parents were evaluated for heterosis over mid parent, better parent and standard variety, Pusa Basmati 1 for nine yield components. All the 25 hybrids exhibited significant negative heterobeltiosis for plant height and significant positive heterosis over mid parent, better parent and standard check for tiller number. IR 64/HBC 85, IR 64/Basmati 6129, PR 109/Basmati 410 and PK 1379- 9-1-1/Basmati 6129 manifested high average heterosis, heterobeltiosis and standard heterosis for grain yield per plant. From this study it is revealed that heterosis for grain yield was mainly because of simultaneous manifestation of heterosis for tillers number, panicle length, fertile grains per panicle, total spikelets per panicle and test weight.

Key words : Rice, Heterosis, Line x Tester, Yield components.