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The interplay of hydraulic failure and cell vitality explains tree capacity to recover from drought
Physiologia Plantarum ( IF 6.4 ) Pub Date : 2021-01-25 , DOI: 10.1111/ppl.13331
Marylou Mantova 1 , Paulo E. Menezes‐Silva 2 , Eric Badel 1 , Hervé Cochard 1 , José M. Torres‐Ruiz 1
Affiliation  

Global climatic models predict an increment in the frequency and intensity of drought events, which have important consequences on forest dieback. However, the mechanisms leading to tree mortality under drought conditions and the physiological thresholds for recovery are not totally understood yet. This study aimed to identify what are the key physiological traits that determine the tree capacity to recover from drought. Individuals of a conifer (Pseudotsuga menziesii M.) and an angiosperm (Prunus lusitanica L.) species were exposed to drought and their ability to recover after rehydration monitored. Results showed that the actual thresholds used for recovery from drought based on percentage loss of conductance (PLC) (i.e. 50% for conifers, 88% for angiosperms) do not provide accurate insights about the tree capacity for surviving extreme drought events. On the contrary, differences in stem relative water content (RWCStem ) and the level of electrolytes leakage (EL) were directly related to the capacity of the trees to recover from drought. This was the case for the conifer species, P. menziesii, for which higher RWCStem and lower EL values were related to the recovery capacity. Even if results showed a similar trend for the angiosperm P. lusitanica as for the conifers, differences between the two traits were much more subtle and did not allow an accurate differentiation between trees able to recover and those that were not. RWCStem and EL could work as indicators of tree capacity to recover from drought for conifers but more studies are required to confirm this observation for angiosperms.

中文翻译:

水力衰竭和细胞活力的相互作用解释了树木从干旱中恢复的能力

全球气候模型预测干旱事件的频率和强度会增加,这对森林枯死有重要影响。然而,干旱条件下导致树木死亡的机制和恢复的生理阈值尚不完全清楚。本研究旨在确定决定树木从干旱中恢复能力的关键生理特征是什么。针叶树 (Pseudotsuga menziesii M.) 和被子植物 (Prunus lusitanica L.) 个体暴露于干旱中,并监测它们在补液后恢复的能力。结果表明,用于从干旱中恢复的实际阈值基于电导率损失百分比 (PLC)(即针叶树为 50%,88% 的被子植物)没有提供关于树木在极端干旱事件中幸存的能力的准确见解。相反,茎相对含水量 (RWCStem) 和电解质泄漏水平 (EL) 的差异与树木从干旱中恢复的能力直接相关。针叶树种 P. menziesii 就是这种情况,其中较高的 RWCStem 和较低的 EL 值与恢复能力有关。即使结果显示被子植物 P. lusitanica 与针叶树的趋势相似,这两种性状之间的差异要微妙得多,并且无法准确区分能够恢复的树木和不能恢复的树木。
更新日期:2021-01-25
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