Coordination between non-structure carbohydrates and hydraulic function under different drought duration, intensity, and post-drought recovery
Coordination between non-structure carbohydrates and hydraulic function under different drought duration, intensity, and post-drought recovery
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DOI：
10.1016/j.envexpbot.2023.105485
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发表时间：
2023-08
影响因子：
5.7
通讯作者：
Qing-Hua Liu;Chunxiao Wu;Liqiang Gao;L. Ying
中科院分区：
文献类型：
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作者：
Qing-Hua Liu;Chunxiao Wu;Liqiang Gao;L. Ying
干旱和旱后恢复过程中非结构性碳水化合物(NSCs)和水力功能的维持对树木的生存至关重要，但以往的研究缺乏对不同干旱条件下它们之间关系的系统研究。我们将幼苗暴露在不同程度的干旱强度下三年，然后进行短期、高强度干旱和复灌，以探索NSCs与水力功能之间的协调性。我们发现，长期干旱减少了所有器官中的天然血栓，神经干细胞在树干和树枝中被消耗，以应对干旱。相反，在严重干旱胁迫下，根系中的总可溶性糖和淀粉含量分别增加了33.90%和24.97%，以适应干旱环境。当短期和高强度干旱导致水力失调时，植物积累了包括葡萄糖、蔗糖和麦芽糖在内的可溶性糖，主要是由淀粉消耗驱动的。同时，适应干旱的植物以消耗神经干细胞为代价具有更高的抗栓性。在重新灌溉后，适应干旱的植物保持较低的碳消耗，并提高其根部的碳储量，以应对未来的干旱条件。综上所述，长期干旱处理提高了植物在极端干旱胁迫下的存活率。本研究系统地阐述了长期干旱遗留对短期干旱和再灌溉反应的影响。
The maintenance of non-structural carbohydrates (NSCs) and hydraulic function during drought and post-drought recovery is crucial for tree survival, but previous studies lack systematic investigation of their relationship under different drought conditions. We exposed seedlings to varying degrees of drought intensity for three years, followed by short-term, high-intensity drought and re-irrigation, to explore the coordination between NSCs and hydraulic function. We found that long-duration drought reduced native embolism in all organs, and NSCs were consumed in trunks and branches in response to drought. In contrast, total soluble sugar and starch concentrations in roots under severe drought stress increased by 33.90 % and 24.97 %, respectively, in order to survive and adapt to the drought environment. When short-term and high-intensity drought caused hydraulic dysfunction, plants accumulated soluble sugars, including glucose, sucrose, and maltose, mainly driven by starch depletion. Meanwhile, drought-adapted plants had higher embolism resistance at the cost of consuming NSCs. After re-irrigation, drought-adapted plants maintain lower carbon consumption and improve carbon reserves in their roots to cope with future drought conditions. In summary, long-term drought treatment improves plant survival under extreme drought stress. This study systematically illustrates the long-term drought legacy effects on short-term drought and re-irrigation responses.