Testing the limits of plant drought stress and subsequent recovery in four provenances of a widely distributed subtropical tree species

编号 040034202

推送时间 20220509

研究领域 森林培育 

年份 2022 

类型 期刊 

语种 英语

标题 Testing the limits of plant drought stress and subsequent recovery in four provenances of a widely distributed subtropical tree species

来源期刊 Plant,Cell & Environment

期 第342期

发表时间 20220105

关键词 NSC;  hydraulic failure;  intraspecies;  mortality;  threshold.; 

摘要 Drought-induced tree mortality may increase with ongoing climate change. Unraveling the links between stem hydraulics and mortality thresholds, and the effects of intraspecific variation, remain important unresolved issues. We conducted a water manipulation experiment in a rain-out shelter, using four provenances of Schima superba originating from a gradient of annual precipitation (1124–1796?mm) and temperature (16.4–22.4°C). Seedlings were droughted to three levels of percentage loss of hydraulic conductivity (i.e., P50, P88 and P99) and subsequently rewatered to field capacity for 30 days; traits related to water and carbon relations were measured. The lethal water potential associated with incipient mortality was between P50 and P88. Seedlings exhibited similar drought responses in xylem water potential, hydraulic conductivity and gas exchange. Upon rehydration, patterns of gas exchange differed among provenances but were not related to the climate at the origin. The four provenances exhibited a similar degree of stem hydraulic recovery, which was correlated with the magnitude of antecedent drought and stem soluble sugar at the end of the drought. Results suggest that there were intraspecific differences in the capacity of S. superba seedlings for carbon assimilation during recovery, indicating a decoupling between gas exchange recovery and stem hydraulics across provenances.

服务人员 孙小满

服务院士 尹伟伦

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