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利用籼型水稻 4个不育系和 4个恢复系配组的 4× 4 NCII交配设计 ,对其光合性状的配合力及遗传力进行分析。结果表明 ,(1)在叶绿素含量、饱和光强、量子效率、 CO2 补偿点、光合功能期、叶片寿命等性状中 ,亲本的基因加性效应对杂种一代性状形成起主导作用 ;在光合速率和气孔导度等性状中 ,遗传变异主要来自基因的非加性效应。 (2 )光合速率、光合功能期、 CO2 补偿点和饱和光强等性状受不育系影响较大 ,恢复系对叶绿素含量、叶片寿命和量子效率等性状作用较大 ,蒸腾速率和气孔导度等性状受父母本互作效应影响。 (3)各组合 9个性状小区均数与亲本一般配合力效应之和之间的相关系数达极显著水平。利用亲本一般配合力效应之和预测杂交稻光合性状表现对有效选配高光效组合有重要意义。 (4)各性状狭义遗传力的大小依次为 :饱和光强、 CO2 补偿点、量子效率、叶绿素含量、叶片寿命、光合功能期、蒸腾速率、光合速率及气孔导度
The 4 × 4 NCII mating design of 4 CMS lines and 4 restorer lines of indica rice was used to analyze the combining ability and heritability of photosynthetic characters. The results showed that: (1) The gene additive effect of parents played a leading role in the formation of hybrid progenies in the aspects of chlorophyll content, light intensity, quantum efficiency, CO2 compensation point, photosynthetic function, leaf life span and other traits. Stomatal conductance and other traits, the genetic variation mainly from the gene’s non-additive effect. (2) The photosynthetic rate, photosynthetic functional period, CO2 compensation point and saturated light intensity were more affected by the CMS lines. The restorer lines had a greater effect on chlorophyll content, leaf life and quantum efficiency, and the transpiration rate and stomatal conductance Other traits are affected by the parental interaction. (3) The correlation coefficient between the mean of nine traits in each combination and the sum of the general combining ability effect of the parents reached an extremely significant level. It is important to predict the photosynthetic traits of hybrid rice by combining the effects of general combining ability of parents. (4) The narrow heritability of each trait was in order of saturation light intensity, CO2 compensation point, quantum efficiency, chlorophyll content, leaf life, photosynthetic function, transpiration rate, photosynthetic rate and stomatal conductance