膜对采后园艺作物衰老的影响

植物衰老是由内在和外部环境因素所诱导和引起的一种主动过程 ,其中膜的劣变是这种过程早期的表现形式和基本特征。简要评述了膜系统对采后园艺作物的衰老作用。有证据表明膜系统破坏是采后园艺作物衰老的关键事件。膜脂生物化学和生物物理性质的变化、酶促和非酶促的过氧化作用导致了膜特性的改变和功能上的失调 (如离子泄漏和细胞去区域化 )。这样 ,反过来又进一步引起细胞代谢异常 ,并加速衰老进程。目前 ,膜系统对采后园艺作物衰老的作用过程正逐步得到阐明

Membrane effects in postharvest senescence of horticultural crops

Senescence is an active progress initiated by internal and environment triggers, and membrane deterioration is an early and fundamental feature of this process. Advances in membrane effects in senescence of postharvest horticultural crops are reviewed. Considerable evidence for senescence of postharvest horticultural crops supports membrane damage as the key event. Biochemical and biophysical changes in membrane lipids and enzymatic and non-enzymatic lipid peroxidation lead to altered membrane properties and defects, such as ion leakage and cellular decompartmentation, which, in turn, result in abnormality in cellular metabolism and accelerated death. A clearer picture of the sequence of occurrences in effects of membranes on postharvest senescence of horticultural crops is now emerging.