Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant

Abstract Drought-induced tree die-off related to climate change is occurring worldwide and affects the carbon stocks and biodiversity in forest ecosystems. Hydraulic failure and carbon starvation are two commonly proposed mechanisms for drought-induced tree die-off. Here, we show that inhibited bran...

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Autores principales:	Shin-Taro Saiki, Atsushi Ishida, Kenichi Yoshimura, Kenichi Yazaki
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/53fd57e7894b4df9a19d48b9fc1795ab
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spelling	oai:doaj.org-article:53fd57e7894b4df9a19d48b9fc1795ab2021-12-02T16:06:14ZPhysiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant10.1038/s41598-017-03162-52045-2322https://doaj.org/article/53fd57e7894b4df9a19d48b9fc1795ab2017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03162-5https://doaj.org/toc/2045-2322Abstract Drought-induced tree die-off related to climate change is occurring worldwide and affects the carbon stocks and biodiversity in forest ecosystems. Hydraulic failure and carbon starvation are two commonly proposed mechanisms for drought-induced tree die-off. Here, we show that inhibited branchlet respiration and soil-to-leaf hydraulic conductance, likely caused by cell damage, occur prior to hydraulic failure (xylem embolism) and carbon starvation (exhaustion of stored carbon in sapwood) in a drought-tolerant woody species, Rhaphiolepis wrightiana Maxim. The ratio of the total leaf area to the twig sap area was used as a health indicator after drought damage. Six adult trees with different levels of tree health and one dead adult tree were selected. Two individuals having the worst and second worst health among the six live trees died three months after our study was conducted. Soil-to-leaf hydraulic conductance and leaf gas exchange rates decreased linearly as tree health declined, whereas xylem cavitation and total non-structural carbon remained unchanged in the branchlets except in the dead and most unhealthy trees. Respiration rates and the number of living cells in the sapwood decreased linearly as tree health declined. This study is the first report on the importance of dehydration tolerance and respiration maintenance in living cells.Shin-Taro SaikiAtsushi IshidaKenichi YoshimuraKenichi YazakiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-7 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Shin-Taro Saiki Atsushi Ishida Kenichi Yoshimura Kenichi Yazaki Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
description	Abstract Drought-induced tree die-off related to climate change is occurring worldwide and affects the carbon stocks and biodiversity in forest ecosystems. Hydraulic failure and carbon starvation are two commonly proposed mechanisms for drought-induced tree die-off. Here, we show that inhibited branchlet respiration and soil-to-leaf hydraulic conductance, likely caused by cell damage, occur prior to hydraulic failure (xylem embolism) and carbon starvation (exhaustion of stored carbon in sapwood) in a drought-tolerant woody species, Rhaphiolepis wrightiana Maxim. The ratio of the total leaf area to the twig sap area was used as a health indicator after drought damage. Six adult trees with different levels of tree health and one dead adult tree were selected. Two individuals having the worst and second worst health among the six live trees died three months after our study was conducted. Soil-to-leaf hydraulic conductance and leaf gas exchange rates decreased linearly as tree health declined, whereas xylem cavitation and total non-structural carbon remained unchanged in the branchlets except in the dead and most unhealthy trees. Respiration rates and the number of living cells in the sapwood decreased linearly as tree health declined. This study is the first report on the importance of dehydration tolerance and respiration maintenance in living cells.
format	article
author	Shin-Taro Saiki Atsushi Ishida Kenichi Yoshimura Kenichi Yazaki
author_facet	Shin-Taro Saiki Atsushi Ishida Kenichi Yoshimura Kenichi Yazaki
author_sort	Shin-Taro Saiki
title	Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
title_short	Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
title_full	Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
title_fullStr	Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
title_full_unstemmed	Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
title_sort	physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/53fd57e7894b4df9a19d48b9fc1795ab
work_keys_str_mv	AT shintarosaiki physiologicalmechanismsofdroughtinducedtreedieoffinrelationtocarbonhydraulicandrespiratorystressinadroughttolerantwoodyplant AT atsushiishida physiologicalmechanismsofdroughtinducedtreedieoffinrelationtocarbonhydraulicandrespiratorystressinadroughttolerantwoodyplant AT kenichiyoshimura physiologicalmechanismsofdroughtinducedtreedieoffinrelationtocarbonhydraulicandrespiratorystressinadroughttolerantwoodyplant AT kenichiyazaki physiologicalmechanismsofdroughtinducedtreedieoffinrelationtocarbonhydraulicandrespiratorystressinadroughttolerantwoodyplant
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Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant

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