杂交水稻“多系育种”改良效果及应用评价

Evaluation of Multilinear line Breeding Program in Improving Rice Hybrids

通过４×６不完全双列杂交和多恢系列恢复系的稻瘟病接种鉴定以及多系组合的比较试验并引用省区试结果，分析了通过“多系育种”育成的恢复系的配合力和抗稻瘟病力以及所配组合的丰产性、抗性和稻米品质。结果表明，“多系育种”育成的恢复系在配合力及抗稻瘟病上超过了公共轮回亲本明恢６３，所配多系杂交稻组合大部份在产量、抗稻瘟病以及稻米品质上超过了汕优６３。多系组合在生产上大面积种植应用应注意不同的多系组合应因种栽培。

A 4×6 incomplete diallele cross was conducted to evaluate the combining ability and resistance to rice blast of restoring lines developed from a multilinear line breeding program and to determine the grain yield, grain quality and resistance to rice blast of rice combinations from these new restoring lines. The results indicated that the combining ability and rice blast resistance of the new restoring lines were higher than that of the recurrent parent Minghui 63,grain yield,grain quanlity and rice blast resistance of most hybrids from the new restoring lines are superior to that of Shanyou 63.Some new rice hybrids from Multilinear line breeding program were released to farmers for economical rice production in Sichuan Province.