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在田间水、旱处理条件下 ,比较了不同抗旱类型小麦品种的抗旱性 ,分析了供试品种抗旱性与开花期旗叶的光合特性的关系。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、气孔导度 (gs)差别很大 ,幅度分别在 7～ 2 3μmol·m- 2 ·s- 1、 5 9 5～ 98 2mmol·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、气孔导度 ,有利于其适应旱胁迫 ;冀麦 32 35、中麦 9号开花期光合速率、气孔导度受到很大抑制 ,可能是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高的光合速率、气孔导度 ,但其抗旱系数 (DRC)、抗旱指数 (DRI)都很低 ,说明开花期的光合特性对其影响并不大 ,其抗旱性差是开花期以后生理代谢过程受到影响的结果
The drought resistance of wheat cultivars with different drought-resistance types were compared under field water and drought conditions. The relationship between the drought resistance of cultivars and the photosynthetic characteristics of flag leaf at flowering stage was analyzed. 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 and stomatal conductance (Gs) differed greatly at flowering stage ~ 23μmol · m-2 · s-1, 595-98 2mmol · m-2 · s-1, and the wheat varieties Jinmai 33 and HeNan 85 9 which maintained strong photosynthetic rate , Stomatal conductance, which is conducive to adapt to drought stress; Jimai 32 35, Zhongmai 9 anthesis flowering photosynthetic rate, stomatal conductance is greatly inhibited, may be one of the factors of its drought resistance; Changle 5 , While the temperature and the stomatal conductance of Wenmai 6 maintained the highest photosynthetic rate and stomatal conductance at anthesis, its drought resistance index (DRC) and drought resistance index (DRI) were very low, indicating that the photosynthetic characteristics at flowering stage were not significant, Its poor drought resistance is the result of physiological metabolic processes affected after flowering