目前杂交水稻多为品种间籼籼杂交,亲缘关系近,杂种优势有限。现在的育种工作者试图寻找籼爪交、籼粳交杂种优势利用。根据现有报道,各地虽有籼爪交、籼粳交研究取得一定进展和阶段成果,但由于籼爪交、籼粳交其杂种一代结实率低、饱满度差、生育期超亲等问题,故成功率甚少。宁德 At present, most hybrid rice varieties are indica-indica hybrids with close genetic relationship and limited heterosis. Now breeders are trying to find indica claw hybrids, indica and japonica hybrids. According to the existing reports, although some indica claw crosses have been made in all parts of the country, progress has been made in the research on indica and japonica crossbreeding. However, due to the low seed setting rate, plumpness and super-progeny during the cross between indica and japonica, So little success rate. Ningde