Photoprotective and antioxidative mechanisms against oxidative damage in Fargesia rufa subjected to drought and salinity
Photoprotective and antioxidative mechanisms against oxidative damage in Fargesia rufa subjected to drought and salinity
复制标题
干旱和盐度下红箭竹抗氧化损伤的光保护和抗氧化机制
DOI：
10.1071/fp16214
复制
发表时间：
2017-01-01
影响因子：
3
通讯作者：
Wang, Yan-Jie
中科院分区：
文献类型：
--
作者：
Liu, Cheng-Gang;Wang, Qing-Wei;Wang, Yan-Jie
干旱和盐碱是限制植物生产力的两种最常见和最常见的非生物胁迫，但目前尚不清楚竹子物种是否具有有效的机制来抵御干旱和盐分单独或联合造成的氧化损伤。在这项研究中，我们利用对森林碳汇和濒危大熊猫具有重要作用的红花箭竹，评估了它们对干旱、盐分及其组合的生理、生化和超微结构的响应。与盐分处理和复合胁迫处理相比，单独干旱条件下，红花镰刀菌叶片失水、光化学抑制、色素降解、活性氧积累、膜脂过氧化和细胞器损伤均有所减少。干旱条件下的优异表现仅归因于更大的热耗散和水-水循环能力，更高的SOD/AsA-GSH循环酶活性，以及有利的抗氧化剂氧化还原平衡。因此，相对于单独的盐分和干旱+盐分，干旱条件下的红曲霉植物表现出高效的氧化损伤保护机制，一旦胁迫解除，这很可能允许光合作用可塑性的加速恢复。
Drought and salinity are the two most common and frequently co-occurring abiotic stresses limiting plant productivity worldwide, yet it remains unclear whether bamboo species possess effective mechanisms to protect against oxidative damage caused by drought and salinity, either alone or in combination. In this study, we utilised Fargesia rufa Yi, a species important to forest carbon sequestration and endangered giant pandas, to evaluate physiological, biochemical and ultrastructural responses to drought, salinity and their combination. Under drought alone, F. rufa exhibited reduced water loss from leaves, photochemistry inhibition, pigment degradation, reactive oxygen species accumulation, lipid peroxidation, and damage to organelles compared with salinity and combined stress treatments. The superior performance under drought alone was attributed to greater thermal dissipation and the water-water cycle capacities, increased SOD/AsA-GSH cycle enzymes activities, and a favourable redox balance of antioxidants. Therefore, relative to salinity alone and drought+salinity, F. rufa plants under drought exhibit highly efficient mechanisms to protect against oxidative damage, which most likely allow accelerated recovery of photosynthetic plasticity once the stress is removed.