广亲和性品种与粳稻杂交F_1代主要经济性状的观察与分析

用籼型广亲和品种“二九丰”、偏籼型广亲和品种“Ｄｕｌａｒ”与粳型恢复系共作了１７个杂交组合，用“二九丰”与普通粳稻作了６个杂交组合，对其Ｆ１代进行了主要经济性状的观察研究。结果表明：１．“二九丰”、“Ｄｕｌａｒ”与模型恢复系及普通粳稻杂交Ｆ１代结实率明显高于典型籼粳交Ｆ１代的结实率，个别组合可以达到普通籼、粳稻的一般结实率水平。２．其Ｆ１代具有强大的经济优势，且主要体现在有效分蘖和每穴总粒数两个主要经济性状上。３．广亲和性品种的科学利用，可视为当前籼粳亚种间杂种优势利用育种战略上的一大重要措施。

ANALYSIS ON MAIN ECONOMIC CHARACTERISTICS OF F_1s OF WCVs×JAPONICA

Main economic characteristics of 17 japonica rester×WCVs and japonica×Erjiufeng crosses were observed and analysed.It was shown that:1)Rate of seed setting of sub-indica Dular×japonica and indica Erjiufeng(WCVs)×japonica were higher than that of indica×japonica.Some crosses can seed set normally.2)There were strong economic heterosis,spacial effective tillers and total grains per panicle in the former crosses.3)It was important measure that heterosis of indica×japonica in scientific breeding that WCVs were used.