Heterosis of Yield and Related Characters in F1 Hybrids Rice Between Thai Promising Rice Varieties and Thermo-sensitive Genic Male Sterile Line
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Abstract
Heterotic performance for yield and related characters were estimated in F1 hybrid rice by crossing between three Thai promising rice varieties namely, Suphan Buri 1, Suphan Buri 60 and Pathum Thani 1 to KDML 105 TGMS 1 and KDML 105 TGMS 2, two thermo-sensitive genic male sterile lines. Half diallel cross was designed for developing of six F1 hybrid crosses. Three hybrid crosses: KDML 105 TGMS 2/SP1, KDML 105 TGMS-2/SP60 and KDML 105 TGMS 2/PT1, their F1 hybrids showed significantly positive heterosis over their better parent for 1,000-grain weight and grain weight/plant. Especially the cross, KDML 105 TGMS2/SP60 gave the highest heterotic for yield components i.e. 1,000 grain weight and grain weight/plant with 1.33 and 49.36 %, respectively. For related characters, day to flowering, day to maturing and plant height, showed significantly negative heterosis over mid-parent and their better parent all F1 hybrid crosses. Results of this study could be summarized that development of two-lines hybrid rice variety by using thermo-sensitive genic male sterile line is possible for production in Thailand.
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References
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