干旱胁迫对植物的影响(5页)Good is good, but better carries it.精益求精,善益求善。干旱胁迫对植物影响摘要:胁迫严重影响着植物的生长发育,如干旱胁迫,可造成经济作物产量的逐年大幅下降[1],它们不能躲避不利的环境变化, 它们需要快速的感应胁迫刺激进而适应各种环境胁迫。大多数植物遭受干旱逆境后各个生理过程都会受到不同程度的影响。我们都知道 ,水分在植物的生命活动中起着重要的作用,不仅是光合作用的原料之一,而且还维持着植物的正常体态。因此,我们要用各种预防途径来减少干旱对植物的影响。关键词:干旱胁迫 植物 影响 Drought stress impact on plantsAbstract : stress seriously influence the plant growth and development, such as drought stress, which can cause economic crop production has fallen dramatically year by year [1], they cannot escape from adverse environmental change, they need fast induction stress stimulation and adapt to various environmental stresses. Most plants by drought adversity after various physiological processes are subject to the influence of different level. As we all know, water in the plant life activities play an important role, not only is one of the raw material of photosynthesis, but also maintains the normal posture of plants. Therefore, we want to use a variety of preventive ways to minimize the effects of drought on plant.Keywords : plant drought stress inflengce 引言:干旱可以分为土壤干旱和大气干旱,而大气干旱往往伴随着较高的温度,这两种干旱有时单独出现,但是,在一般情况下同时出现的,这两种干旱方式对植物的影响是相似的。1、 干旱对植物生长发育的影响 植物的生长是环境和植物内部代谢活动相互作用的结果,在各种和植物有关的环境因素中,水的有效性占主导地位。其中,植物叶子的扩展生长对缺水最为敏感,只要有轻微的胁迫,就会使其受到明显的限制。无论是细胞的分裂分化或体积的扩大,都同时依赖于水分的吸收,溶质的积累和细胞壁的松弛。任何能直接或间接影响三者之一的因素均能影响生长。近年来, 许多用活体材料进行的试验表明, 水分亏缺能够改变细胞壁的伸...