Interaction of drought and high temperature on photosynthesis and grain-filling of wheat
Interaction of drought and high temperature on photosynthesis and grain-filling of wheat
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DOI：
10.1023/a:1026237816578
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发表时间：
2003-11
期刊：
影响因子：
4.9
通讯作者：
N. H. Shah;G. M. Paulsen
中科院分区：
文献类型：
--
作者：
N. H. Shah;G. M. Paulsen
干旱和高温经常同时发生，但它们对作物的影响通常是单独调查的。比较了干旱、高温及其交互作用对小麦光合作用和籽粒生长的影响。植物（cv. Len）在25/20 ± 2 °C昼夜下均匀地生长在浇水充足的土壤中，直到开花，然后在15/10、25/20和35/30 °C的受控环境中进行无干旱（土壤田间持水量）和干旱（植物水势为-0.0至-2.4 MPa）的制度，直到生理成熟。干旱降低了光合作用、气孔导度、活叶面积、地上部和籽粒质量、籽粒重量和可溶性糖含量，但提高了植物水分利用效率。高温加速了光合速率和叶面积的下降，降低了地上部和籽粒质量，降低了籽粒重量和含糖量，降低了水分利用效率。两种胁迫之间的相互作用是明显的，干旱对所有生理参数的后果是更严重的高温比低温。协同相互作用表明，小麦生产力的降低相当多的组合压力比单独的压力，和大部分的影响是光合过程。
Drought and high temperature often occur simultaneously, but their effects on crops are usually investigated individually. Our objective was to compare effects of drought, high temperature, and their interactions on photosynthesis and grain-growth of wheat (Triticum aestivumL.). Plants (cv. Len) were grown uniformly in well-watered soil at 25/20 ± 2 °C day/night until anthesis, when they were subjected to regimes of no drought (soil at field capacity) and drought (plant water potential of −.0 to −2.4 MPa) at 15/10, 25/20, and 35/30 °C in controlled environments until physiological maturity. Drought decreased photosynthesis, stomatal conductance, viable leaf area, shoot and grain mass, and weight and soluble sugar content of kernels but increased plant water-use efficiency. High temperature hastened the decline in photosynthesis and leaf area, decreased shoot and grain mass as well as weight and sugar content of kernels, and reduced water-use efficiency. Interactions between the two stresses were pronounced, and consequences of drought on all physiological parameters were more severe at high temperature than low temperature. The synergistic interactions indicated that productivity of wheat is reduced considerably more by the combined stresses than by either stress alone, and that much of the effect is on photosynthetic processes.