摘要： 测定了41个冬小麦大粒品种的旗叶光合性能,发现品种间有很大差异:表现光合速率平均为15.54±4.56mgCO₂.dm^-2,h^-1,光呼吸平均为26.77%±9.19%,高氧抑制光合作用,光合下降量为43.26%±10.54%;低氧促进光合作用,氧浓度每下降1%,光合强度平均提高1.41%,高温下光合下降量为43.26%±34.44%.据此进行了聚类分析,41个品种共分为四类,即高光合类,低光合类,适应性强类和适应性差类.

关键词: 冬小麦, 旗叶, 光合作用, 聚类分析

Abstract: The physiological parameters of photosynthesis of flag leaf of winter wheat (Triticum aestivum) cultivars with big kernels were determined. The results indicated that there existed large differences in physiological properties of photosynthesis among different wheat genotypes. The means of apparent photosynthesis and photorespiration were 15.54±4.56mgCO2?dm-2?h-1 and 26.77%±9.19% respectively. High concentration of oxygen and high temperature inhibited photosynthesis by 43.26% and 43.25% respectively. In the contrast, low level of oxygen stimulated photosynthesis. As oxygen concentration decreased by 1 %, the photosynthesis rate increased byl.46%. Forty-one cultivars tested were classified into four groups by cluster analysis based on the parameters measured: Group 1 with high intensity of photosynthesis, Group 2 with low intensity of photosynthesis, Group 3 with photosynthesis resistant to stresses and Group 4 with photosynthesis sensitive to stresses.

Key words: Triticum aestivum, Photosynthesis, Cluster analysis