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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
Fifteen different cold tolerant cultivars were used to produce 15 combinations and their parents, and 1 / 2P (P - 1) was used to make genetic studies on the main economic traits of Yunnan rice in different generations in the Indica, Indica - Japonica and Indica - Japonica regions. The results showed that: (1) The main economic traits, GCA and SCA of parents and their hybrid combinations in different rice crop areas were significantly different, and the genotypes and ecological conditions showed some regular changes . (2) The parental varieties and their combinations increased with height, plant height, spike length, grain number per spike and spikelet number increased, but the seed setting rate was opposite. The main economic traits of hybrid offspring were different rice areas And the differences of different generations are closely related with the genetic relationship. The objectives of rice breeding should be based on different rice growing areas