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Title: The dynamics of carbon stored in xylem sapwood to drought-induced hydraulic stress in mature trees.
Authors: Yoshimura, Kenichi
Saiki, Shin-Taro
Yazaki, Kenichi
Ogasa, Mayumi Y
Shirai, Makoto
Nakano, Takashi
Yoshimura, Jin
Ishida, Atsushi  kyouindb  KAKEN_id
Author's alias: 石田, 厚
Issue Date: 15-Apr-2016
Publisher: Nature Publishing Group
Journal title: Scientific reports
Volume: 6
Thesis number: 24513
Abstract: Climate-induced forest die-off is widespread in multiple biomes, strongly affecting the species composition, function and primary production in forest ecosystems. Hydraulic failure and carbon starvation in xylem sapwood are major hypotheses to explain drought-induced tree mortality. Because it is difficult to obtain enough field observations on drought-induced mortality in adult trees, the current understanding of the physiological mechanisms for tree die-offs is still controversial. However, the simultaneous examination of water and carbon uses throughout dehydration and rehydration processes in adult trees will contribute to clarify the roles of hydraulic failure and carbon starvation in tree wilting. Here we show the processes of the percent loss of hydraulic conductivity (PLC) and the content of nonstructural carbohydrates (NSCs) of distal branches in woody plants with contrasting water use strategy. Starch was converted to soluble sugar during PLC progression under drought, and the hydraulic conductivity recovered following water supply. The conversion of NSCs is strongly associated with PLC variations during dehydration and rehydration processes, indicating that stored carbon contributes to tree survival under drought; further carbon starvation can advance hydraulic failure. We predict that even slow-progressing drought degrades forest ecosystems via carbon starvation, causing more frequent catastrophic forest die-offs than the present projection.
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
URI: http://hdl.handle.net/2433/210267
DOI(Published Version): 10.1038/srep24513
PubMed ID: 27079677
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