【摘要】 用 5个不同耐冷级别品种按 1 /2P(P - 1 )配制 1 5个组合及其亲本在籼稻区、籼粳交错区和温凉粳稻区进行云南稻种不同世代主要经济性状的遗传研究 ,结果表明 :(1 )不同稻作区亲本品种及其杂交组合主要经济性状及其一般配合力 (GCA)、特殊配合力 (SCA)存在明显差异 ,因基因型和生态条件呈现一定的规律性变化。 (2 )亲本品种及其组合随海拔升高 ,株高、穗长、每穗实粒数和颖花数有增大的趋势 ,但结实率则相反 ;杂种后代主要经济性状SCA的不同稻区及不同世代的差异与亲缘关系的远近密切相关 ,稻作育种目标应根据不同稻作区而定更多还原

【Abstract】 Five standard varieties of rice (Oryza sativa L.) with different cold tolerance were crossed in 15 combinations and grown in Sanya, Hainan (Alt. 15 m), Kunming, Yunnan (Alt. 1916 m) and Yiliang, Yunnan (alt. 1532 m), and the main agronomic characters were recorded in their P 1,P 2,F 1,F 2 and F 3. Great differences were observed among various varieties and their cross combinations in the GCA and SCA of their agronomic characters investigated in this study. Plant height, ear length, filled grains per spike and total grains per spike tended to increase with altitude, and seed setting rate showed a reverse trend: it dropped with the increase in altitude. The extent of difference in the SCA of the agronomic characters between different rice cultivating regions and between different generations was shown to be closely associated with the affinity of the parents. It is concluded that in deciding rice breeding targets, the conditions of specific rice-cropping regions should be taken into consideration.更多还原