The Synergistic Responses of Different Photoprotective Pathways in Dwarf Bamboo (Fargesia rufa) to Drought and Subsequent Rewatering.
The Synergistic Responses of Different Photoprotective Pathways in Dwarf Bamboo (Fargesia rufa) to Drought and Subsequent Rewatering.
复制标题
矮竹（Fargesia rufa）不同光保护途径对干旱和后续补水的协同反应
DOI：
10.3389/fpls.2017.00489
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发表时间：
2017
影响因子：
5.6
通讯作者：
Tariq A
中科院分区：
文献类型：
--
作者：
Liu C;Wang Y;Pan K;Wang Q;Liang J;Jin Y;Tariq A
由于气温上升和降雨量减少，以矮竹为主的森林经常遭受暂时的干旱。然而，竹类植物CO2同化、光保护途径和活性氧代谢之间的关系尚不清楚。分析了干旱胁迫和复水胁迫下红箭竹（Fargesia rufa）叶片气体交换、叶绿素荧光、能量分配、抗氧化系统和活性氧代谢相关化合物的变化。干旱导致可逆的光化学抑制，特别是净CO2同化，和脂质过氧化由于ROS积累。与此同时，光保护途径，包括水-水循环（特别是中度干旱）和天线色素的调节，热耗散和细胞器水平的抗氧化防御能力（特别是严重干旱），在胁迫阶段上调。相反，光呼吸在干旱胁迫后下调。因此，复水恢复了大部分的光化学活性在干旱，特别是中度干旱。此外，在严重干旱下的热耗散仍在运行，以避免复水后的高活性氧水平。因此，当CO2同化受到限制时，除了光呼吸之外的这些光保护途径的协同作用可以保护光合机构免受不同强度干旱胁迫的氧化损伤。这有助于复水后光合能力的逐步恢复。因此，F. rufa植物可以耐受干旱并且能够在这种环境中存活。亮点：1.研究了干旱和复水对红苞箭竹的影响.干旱导致了光化学的可逆抑制.除光呼吸外，其它光保护途径在干旱期均上调.复水迅速恢复了光化学活性，特别是在中度干旱下。红箭竹具有较强的抗旱能力。
Dwarf bamboo-dominated forests are often subjected to temporary periods of drought due to rising air temperature and decreasing rainfall. Nevertheless, the relationship among CO2 assimilation, photoprotective pathways and metabolism of reactive oxygen species (ROS) remains unexplored in bamboo species. Changes in leaf gas exchange, chlorophyll fluorescence, energy partitioning, antioxidative system and compounds related to ROS metabolism in Fargesia rufa plants subjected to drought and subsequent rewatering were analyzed. Drought resulted in a reversible inhibition of photochemistry, particularly net CO2 assimilation, and lipid peroxidation due to ROS accumulation. Meanwhile, photoprotective pathways, including the water–water cycle (especially for moderate drought), and adjustment in antenna pigments, thermal dissipation and antioxidative defense capacity at organelle levels (especially for severe drought), were up-regulated at the stress phase. Conversely, photorespiration was down-regulated after drought stress. As a result, rewatering restored most of the photochemical activity under drought, especially moderate drought. Moreover, thermal dissipation under severe drought was still operated for avoiding high ROS levels after rewatering. Therefore, the synergistic function of these photoprotective pathways except photorespiration can protect the photosynthetic apparatus from oxidative damage in response to varying intensities of drought stress when CO2 assimilation is restricted. This is helpful for the gradual recovery of photosynthetic capacity after rewatering. Thus, F. rufa plants can withstand drought and is capable of survival in such environment. Highlights:1. The effects of drought and subsequent rewatering on Fargesia rufa were studied.2. Drought resulted in a reversible inhibition of photochemistry.3. Photoprotective pathways except photorespiration were up-regulated at the drought phase.4. Rewatering rapidly restored photochemical activity, especially under moderate drought.5. Fargesia rufa plant is capable of resisting and surviving drought environment.