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A染色体组的野生一粒小麦(T.boeoticum)比D染色体组粗山羊草小麦(Ae.squrrosa)的光合速率高11.3—12.9％,从叶片全展到光合速率下降到50％的天数短11.1—15.4％。有D染色体组小麦种叶片的光合速率高于无D染色体组的小麦种,但光合速率在高水平上的持续时间则后者比前者长。叶片展开后叶绿素含量变化可以分为缓降期和速降期两个阶段,缓降期长短与光合速率下降到50％所需天数的相关系数为0.9810,与单位叶面积同化CO_2总量的相关系数为0.9001,所以叶绿素含量缓降期可以作为诊断指标加以应用。不同染色体组小麦种叶(?)叶肉细胞的总环数,每个环的平均面积,叶绿体的数目,基粒片层数等与叶片的光合速率有关。叶片一生中叶绿体超微结构的变化不仅影响光合速率而且与叶绿素含量缓降期有关。
The photosynthetic rate of A.boeoticum in chromosome A was 11.3-12.9% higher than that in Ae. Mequrrosa in chromosome D, and the number of days from photosynthesis to 50% -15.4%. The photosynthetic rate of wheat with D chromosome group was higher than that of wheat without D chromosome group, but the duration of photosynthesis at high level was longer than the former. The leaf chlorophyll content can be divided into two stages: the descending phase and the descending phase. The correlation coefficient between the descending period and the days required for the photosynthesis rate to decrease to 50% is 0.9810, which correlates with the total amount of CO 2 assimilated by unit leaf area The coefficient is 0.9001, so the descending phase of chlorophyll content can be used as a diagnostic indicator. The total number of mesophyll cells, the average area of each ring, the number of chloroplasts, the number of basal lamina and the like of the mesophyll cells in different chromosome groups were related to the photosynthetic rate of the leaves. Changes in the ultrastructure of chloroplasts during leaf life not only affected photosynthetic rate but also correlated with the slowing of chlorophyll content.