论文部分内容阅读
本文研究了水分胁迫下活性氧代谢失调对短枝型苹果幼树光合作用的影响 ,结果表明 :水分胁迫前期光合速率的下降主要与气孔因素有关。但随着胁迫时间的延长和胁迫程度的加剧 ,导致 O- 2 ·产生速率大幅度上升 ,胁迫前期 SOD活性也大幅度增加 ,以减轻 O- 2 ·增加所引起的细胞伤害。但胁迫后期 SOD活性大幅度下降 ,中度、重度胁迫下 O- 2 ·的过量生成超过了防御系统的清除能力 ,从而造成活性氧累积 ,使膜脂过氧化加剧 ,膜系统损伤。因此 ,由活性氧代谢失调而诱发的非气孔因素成为光合速率下降的主要原因。
In this paper, we studied the effects of metabolic imbalance of reactive oxygen species on the photosynthesis of spur apple trees under water stress. The results showed that the decrease of photosynthetic rate was mainly related to stomatal factors. However, with the prolongation of stress and the increase of the degree of stress, the rate of O 2 production increased significantly and the SOD activity in the early stage of stress increased significantly to alleviate the cell injury caused by the increase of O 2 ·. However, the activity of SOD decreased significantly during the later stage of stress, and the overproduction of O 2 · 2 over moderate and severe stress exceeded the removal ability of the defense system, resulting in the accumulation of reactive oxygen species, exacerbating membrane lipid peroxidation and damaging the membrane system. Therefore, the non-stomatal factors induced by the imbalance of active oxygen metabolism become the main reason for the decrease of photosynthetic rate.