Effect of Different Types of Drought Stress on Water Relations and Photosynthesis in Wheat

doi:10.3321/j.issn:1000-7091.1990.02.005

Abstract

Abstract: Detached leaves in air caused quickly water stress, osmotic adjustment of the leaves were not observed and water potential(ψW,) and turgor potential(ψp)of leaves decreased rapidly, therefore, the net photosynthetic rate (Pn)，stomatal conductance (Gs) and mesophylic conductance to CO₂(Gm) depressed on a large scale in short time, In contrary,soil drought caused leaves producing osmotic adjustment in varying degrees, the water potential decreased more slowly, turgor potential was keeped to some extent，Pn, Gs and Gym decreased slowly, Under two types of drought stress, leaves of Shanhe No, g had greater drought tolerance than that of Zhengyin No,1 due to their stronger water holding capacity and greater osmotic adjustment, Thus, the depression of Pn, Gs andG，m of Shanhe No, 6 leaves was smaller than that of Zhengyin leaves,

Key words: Drought stress, Water relations, Photosynthesis, Wheat

Xue Qingwu, Chen Peiyuan. Effect of Different Types of Drought Stress on Water Relations and Photosynthesis in Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1990, 5(2): 26-32. doi: 10.3321/j.issn:1000-7091.1990.02.005.

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