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中文摘要：
在水分胁迫条件下，研究了NO供体硝普钠（SNP）对乡土树种小青杨（Populus pseudo—simonii Kitag）和速生品种欧美杨107（Populus×euramericana cv．“74／76”）气孔运动及光合作用的影响。结果表明，经不同浓度SNP处理后，杨树叶片气孔相对开度降低，叶片气孔导度降低，蒸腾作用减弱：NO对杨树叶片的光合作用具有双重性，一定浓度的SNP可以调节植物的光合作用，缓解干旱胁迫的伤害，浓度达到2．0mmol．L^-1时，则会产生伤害。SNP对107杨的作用效果优于小青杨，表明SNP更有利于提高速生杨对干旱胁迫的气孔反应能力。
英文摘要：
This paper studies the effects of NO （nitric oxide） donor sodium nitroprusside （SNP） on the leaf stomatal movement and photosynthetic characteristics in two different drought-enduring poplars （Populus pseudo-simonii Kitag and Populus xeuramericana cv.＂74/76＂ ） under drought stress. The results indicate that with the increasing of stress time, net photosynthetic rate, stomatal conductance and transpiration rates both poplars are decreased respectively. Different concentrations of SNP induce stomatal closuring of poplars leaves, which decrease stomatal conductance and transpiration rates. At the same time, SNP could increase the photosynthesis rate of P pseudo with the prolongation of drought stress, but decrease the photosynthesis rate of 107 Populus. When the SNP level is 2.0 mmol.L^-1, it is toxic to two poplars. All together, these results suggest that SNP might confer an increased tolerance to 107 Populus better than P. pseudo.
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