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为明确不同生态型小麦品种的光合作用机制 ,以不同生态型小麦品种为材料研究了小麦旗叶的光合性能。结果表明 ,不同生态型小麦品种旗叶生育期间的气孔限制和非气孔限制具有相同的特点 ,在叶片功能旺盛的前中期 ,光合底物 CO2 对光合速率的限制主要是非气孔限制 ,在叶片老化后期 ,光合底物 CO2 对光合作用的限制同时存在着气孔限制和非气孔限制 ;不同生态型品种小麦旗叶光合功能和碳代谢特性具有与生态型表现相关的规律。春性品种叶绿素含量高 ,光合面积大 ,功能高值期 (RSP、PAD)长 ,叶源量 (L SC)大。半冬性品种光合速率高 ,叶绿素含量较低 ,功能高值期较短 ,叶源量最小。冬性品种叶绿素含量最低 ,功能高值期最短 ,叶面积和光合速率与半冬性品种差异较小
To clarify the photosynthetic mechanism of different ecotype wheat cultivars, the photosynthetic characteristics of wheat flag leaf were studied with different ecotypes of wheat as materials. The results showed that stomatal limitation and non-stomatal limitation of different ecotype wheat cultivars during flag leaf growth have the same characteristics. In the early and mid-term leaves with strong function, the limitation of photosynthetic rate of photosynthetic substrates was mainly non-stomatal limitation. , Photosynthesis of photosynthesis substrate photosynthesis limitation exist both stomatal limitation and non-stomatal limitation; photosynthesis and carbon metabolism characteristics of flag leaf of different ecotypes of wheat have ecotype-related performance. Spring varieties had high chlorophyll content, large photosynthetic area, high functional period (RSP, PAD) and large amount of leaf source (L SC). Semi-winter varieties had higher photosynthetic rate, lower chlorophyll content, shorter high-value period and least leaf source. The chlorophyll content of winter varieties was the lowest, the shortest period of high functional value, the difference of leaf area and photosynthetic rate was less than that of semi-winter varieties