论文部分内容阅读
以短枝型新红星苹果幼树盆栽苗为试材，研究了土壤水分胁迫与短枝型苹果叶片膜脂过氧化作用的关系，结果表明：不同程度水分胁迫均使叶片内自由基 ×产生速率增加，细胞质膜相对透性增大，膜脂过氧化产物丙二醛(MDA)含量增多，增加幅度依次为：重度胁迫>中度胁迫>轻度胁迫。方差分析表明：轻度胁迫与对照之间的差异不显著；中度、重度胁迫与对照之间的差异达显著水平。水分胁迫下苹果叶片 ×产生速率与细胞质膜相对透性，MDA含量之间均呈显著正相关。表明水分胁迫引起的膜伤害可能是由于活性氧的累积所造成的。不同程度水分胁迫使叶片内SOD活性在水分胁迫前期比对照均有不同程度的提高，随着胁迫程度、胁迫时间的延长，SOD活性大幅度下降，轻度、中度胁迫虽下降，但仍高于对照水平；而重度胁迫低于对照水平。
The sprout seedlings of spruce apple seedlings were used as materials to study the relationship between soil water stress and membrane lipid peroxidation in spur apple leaves. The results showed that the water content of free radicals × production rate Increased, the relative permeability of the plasma membrane increased, membrane lipid peroxidation product malondialdehyde (MDA) content increased, followed by: severe stress> moderate stress> mild stress. Analysis of variance showed that there was no significant difference between mild stress and control; the difference between moderate and severe stress and control was significant. Under water stress, there was a significant positive correlation between leaf × production rate and relative permeability of plasma membrane and MDA content. It indicates that the membrane damage caused by water stress may be caused by the accumulation of reactive oxygen species. Under different degrees of water stress, the activity of SOD in the leaves increased in different degree compared with the control at the early stage of water stress. With the degree of stress and the prolongation of the stress time, the activity of SOD decreased significantly, although the mild and moderate stress decreased, but remained high At the control level; while the severe stress is lower than the control level.