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小麦开花后衰老期间旗叶光合作用速率变化分缓慢下降和快速下降两个阶段。光合作用缓降期间（开花至花后２５ｄ）叶片可溶性蛋白质含量先平稳变化（开花至花后１０ｄ），之后持续降低；叶片叶绿素含量由缓慢升高（开花至花后８ｄ）转为缓慢下降；叶肉细胞结构保持完整。光合作用速降期间（开花２６ｄ以后）旗叶光合作用速率、可溶性蛋白质含量和叶绿素含量快速平行下降，叶绿体嗜锇颗粒数量和体积均增加，基粒片层和基质片层肿胀并分成囊泡，叶绿体被膜破裂，基质散逸于细胞内。
Wheat senescence during flowering after the flag leaf photosynthesis rate of decline slowly decline and rapid decline in two stages. The content of soluble protein in leaves decreased steadily (from flowering to 10 days after flowering) during the period of decreasing photosynthesis (flowering till 25 days after anthesis), and then decreased steadily. The content of chlorophyll in leaves decreased slowly (from 8 days after flowering to 8 days after flowering) Mesophyll cell structure remains intact. The photosynthesis rate, soluble protein content and chlorophyll content of flag leaf decreased rapidly and rapidly during photosynthesis down-flowering (after flowering for 26 days), while the number and volume of osmiophilic particles in chloroplast increased. The granule layer and stroma lamellae swollen and were divided into vesicles, Chloroplast membrane rupture, matrix dissipated in the cell.