Exploitation of Twoline Heterosis Utilizing Thermosensitive Genie Male Sterility System in Rice (Oryza sativa L.)

摘要

Twoline hybrid rice breeding exploiting innovative tool viz., thermosensitive genie male sterile (TGMS) system lias great potential in tropical countries like India. Hence an investigation was carried out by using four TGMS viz., TNAU 27 S, TS 09 12,TS 09 15 and TS 09 25 and fifteen pollen parents by utilizing Line x Tester design. Totally sixty hybrids and nineteen parents were raised along with tioo checks CORH 3 and Improved white ponni in Randomized Block Design with two replications. The Ft tzooline hybrids were evaluated for mean performance, gca and sea effects and heterosis for yield and yield components. Pre-ponderence of non-additive gene action for yield and yield attributing traits was observed by analyzing combining ability. TGMS linesTNAU27 S and TS09 25 and the testers KDML105, CB 05 911/884, BPT5204 and CB 05/501 were good general combiners The twoline hybrids combinations viz., TNAU 27 S x KDML 105, TS 09 25 x KDML 105, TNAU 27 S x CB 05 911/884, TNAU 27 S x BPT 5204 and TNAU 27SxCB 05/501 exhibited good per se performance, high sea and high standard heterosis for yield over checks and the these hybrids could be utilized for commercial exploitation of twoline hybrids in rice. The present study revealed that the TGMS system may be utilized for developing high yielding twoline rice hybrids in India.