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对田间不同水分条件种植下的不同抗旱类型小麦品种开花期旗叶的光合速率与抗旱性的关系进行了比较研究。结果表明 ,供试品种在正常水分处理条件下 ,开花期光合速率 (Pn)无明显差别 ;而在旱处理条件下 ,开花期光合速率差别很大 ,幅度在 7～ 2 3μmol·m-2 ·s-1。抗旱性较强的品种晋麦 33、河农 85 9在开花期保持较强的光合速率 ,有利于其适应旱胁迫 ;冀麦 32 35、中麦 9号开花期光合速率受到很大抑制 ,可能是使其抗旱系数 (DRC)和抗旱指数 (DRI)较小并使其抗旱性较差的因素之一 ;昌乐 5号、温麦 6号虽然在开花期保持较强的光合速率 ,但其DRC和DRI都很低 ,说明开花期的光合速率对其影响并不大 ,其抗旱性差可能是开花期后生理代谢过程受到影响的结果。不同的小麦种质资源在不同的生育阶段有不同的抗旱机制
The relationship between the photosynthetic rate and drought resistance of flag leaf in different drought-resistant wheat cultivars under different water conditions was studied. The results showed that there was no significant difference in photosynthetic rate (Pn) between flowering and flowering under normal water conditions. Under drought conditions, the photosynthetic rate at flowering stage varied greatly from 7 to 23 μmol · m-2 · s-1. Jinmai 33 and Henong 85 9 with stronger drought resistance maintained strong photosynthetic rate at flowering stage, which was favorable to adapt to drought stress. The photosynthesis rate of Ji Ma 32 and Zhongmai 9 were greatly inhibited at flowering stage, which may be greatly inhibited Is one of the factors to make its drought resistance coefficient (DRC) and drought resistance index (DRI) smaller and its drought resistance worse. Although Changle 5 and Wenmai 6 maintain strong photosynthetic rate during anthesis, DRC and DRI are very low, indicating that the photosynthetic rate of flowering has little effect on it, and its poor drought resistance may be the result of the physiological metabolic processes after flowering. Different wheat germplasm resources have different drought-resistance mechanisms at different stages of fertility