Patterns in nonstructural carbohydrate contents at the tree organ level in response to drought duration.,Global Change Biology

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Patterns in nonstructural carbohydrate contents at the tree organ level in response to drought duration.
Global Change Biology ( IF 10.8 ) Pub Date : 2020-04-08 , DOI: 10.1111/gcb.15078
Wenqi He ₁ , Hongyan Liu ₁ , Yang Qi ₁ , Feng Liu ₁ , Xinrong Zhu ₁

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Nonstructural carbohydrates (NSCs) facilitate the adaptation of trees to drought stress. There have been a large number of studies exploring NSC changes in individual plant species and individual organ under drought and showed different trends; however, an understanding of the universal pattern of the plant NSCs responses to drought, particularly to drought duration, is still lacking. Here, we compiled data from 47 experimental studies on 52 tree species and conducted a meta-analysis to evaluate the responses of soluble sugars, starch, and TNSC (total nonstructural carbohydrates including both soluble sugars and starch) concentrations in different tree organs (leaf, stem, and root) to drought intensity and duration. We found that starch in all organs decreased and soluble sugars in leaf increased with prolonged experiment time, and the changes in soluble sugars in all organs were stronger under severe drought than under slight-to-moderate drought. Under slight-to-moderate drought, the NSC content of each organ varied with time, while with the extension of the drought duration, the NSCs gradually approached the control value (no drought stress); this trend remained in the late drought, which means that trees activated physiological regulation processes to increase carbon storage and reduce the risks of carbon starvation. In contrast, long-term severe drought could lead to a net loss of carbohydrates, especially in the root, implying that prolonged severe drought could lead to NSC depletion in the whole plant. As prolonged drought duration has occurred in and is projected for many regions, this paper could shed light into studies on how trees respond and adapt extending drought duration through nonstructural carbon production, transportation, and reallocation.

中文翻译：

响应干旱持续时间，树木器官水平上非结构性碳水化合物含量的模式。

非结构性碳水化合物（NSC）有助于树木适应干旱胁迫。有大量研究探索干旱条件下单个植物物种和单个器官中NSC的变化，并显示出不同的趋势。但是，仍然缺乏对植物NSC应对干旱，特别是干旱持续时间的普遍模式的了解。在这里，我们汇总了来自52种树种的47个实验研究的数据，并进行了荟萃分析，以评估不同树器官（叶，叶，树，茎和根）的干旱强度和持续时间。我们发现随着实验时间的延长，所有器官中的淀粉减少，叶片中的可溶性糖增加，严重干旱下所有器官的可溶性糖变化均强于轻度至中度干旱。在轻度至中度干旱下，各器官的NSC含量均随时间变化，而随着干旱持续时间的延长，NSCs逐渐接近控制值（无干旱胁迫）。这种趋势在干旱后期仍然存在，这意味着树木激活了生理调节过程，以增加碳储存量并减少碳饥饿的风险。相反，长期的严重干旱可能导致碳水化合物的净损失，尤其是在根部，这意味着长期的严重干旱可能导致整个植物中NSC的消耗。由于许多地区的干旱持续时间很长，而且预计在许多地区，

更新日期：2020-03-11

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