Response of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydrates

doi:10.1093/treephys/tpab150

	Response of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydrates
	Shen, Jing-Xian ; Zhang, Yong-Jiang ; Maenpuen, Phisamai ; Zhang, Shu-Bin ; Zhang, Lan 6; Yang, Lin ; Tao, Lian-Bin ; Yan, Peng-Yun ; Zhang, Zhi-Ming ; Li, Shu-Qiong ; Yuan, Xia 4; Kongjarat, Wanwalee 4; Kaewkamol, Sasiwimol 4; Tinprabat, Pimnara 4; Chen, Ya-Jun
	2022
发表期刊	TREE PHYSIOLOGY
ISSN	0829-318X
卷号	42 期号:4 页码:740-753
摘要	Extreme drought events are becoming frequent globally, resulting in widespread plant mortality and forest dieback. Although savanna vegetation cover similar to 20% of the earth's land area, their responses to extreme drought have been less studied than that of forests. Herein, we quantified branch dieback, individual mortality and the associated physiological responses of four evergreen shrubs (Tarenna depauperate Hutch., Maytenus esquirolii (H. Lev.) C.Y. Cheng, Murraya exotica L., Jasminum nudiflorum Lindl.) in a savanna ecosystem in Southwest China to an incidence of extreme drought during 2019 and 2020. We found that 80-100% of the individuals of these species exhibited branch dieback, whereas individual mortality was only found in T. depauperate (4.5%). All species showed high resistance to stem embolism (P-50, water potential at 50% loss of hydraulic conductivity ranged from -5.62 to -8.6 MPa), whereas the stem minimum water potentials reached -7.6 to ca -10.0 MPa during the drought. The low water potential caused high native embolism levels (percentage loss of hydraulic conductivity (PLC) 23-65%) in terminal branches, and the remaining stems maintained 15-35% PLC at the end of the drought. Large within-individual variations in stem vulnerability to embolism were detected, and shedding of vulnerable branches could be a mechanism for shrubs to reduce water and carbon consumption. Overall, the content of total nonstructural carbohydrates (NSC) and their components in the stem were generally comparable to or higher than those in the rainy season in three of the four species. Because the leaves were turgor-less for most time during the drought, high NSC levels during the drought could be due to recycling of NSC from dead branches or translocation from roots. Our results suggest high tolerance of savanna shrub species to extreme drought, which could be facilitated by high embolism resistance in some stems and shedding of vulnerable branches to maintain individual water and carbon balance.
关键词	carbon starvation climate change drought-induced mortality hydraulic failure plant hydraulic architecture vulnerability curves
学科领域	Forestry
DOI	10.1093/treephys/tpab150
收录类别	SCI
语种	英语
WOS关键词	TREE ; FORESTS ; WATER ; MECHANISMS ; PLANTS ; MORTALITY ; HYDRAULICS ; VEGETATION ; TENSION ; TRAITS
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000764694400001
出版者	OXFORD UNIV PRESS
文献子类	Article
出版地	OXFORD
EISSN	1758-4469
资助机构	National Natural Science Foundation of China [41861144016, 31570406, 32071735, 31861133008] ; 'Light of West China' Program and Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences [151C53KYSB20200019] ; CAS 135 program [s2017XTBG - T01, 2017XTBG-F01] ; Yunnan Provincial Science and Technology Department [2018HB068] ; CAS Key Laboratory of Tropical Forest Ecology ; CAS-TWAS President's Fellowship Programme
作者邮箱	yongjiang.zhang@maine.edu ; chenyj@xtbg.org.cn
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/28657
专题	植被与环境变化国家重点实验室
作者单位	1.Yunnan Univ, Sch Ecol & Environm Sci, Inst Ecol & Geobot, Kunming 650091, Yunnan, Peoples R China 2.Chinese Acad Sci, CAS Key Lab Trop Forest Ecol, Xishuangbanna Trop Bot Garden, Mengla 666303, Yunnan, Peoples R China 3.Chinese Acad Sci, Yuanjiang Savanna Ecosyst Res Stn, Xishuangbanna Trop Bot Garden, Yuanjiang 6663300, Yunnan, Peoples R China 4.Univ Maine, Sch Biol & Ecol, Orono, ME 04469 USA 5.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 6.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, 20 Nanxincun, Beijing 100093, Peoples R China 7.Southwest Forestry Univ, Sch Geog & Ecotoursim, Kunming 650224, Yunnan, Peoples R China 8.Chinese Acad Sci, Ctr Plant Ecol, Core Bot Gardens, Kunming 666303, Yunnan, Peoples R China
推荐引用方式 GB/T 7714	Shen, Jing-Xian,Zhang, Yong-Jiang,Maenpuen, Phisamai,et al. Response of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydrates[J]. TREE PHYSIOLOGY,2022,42(4):740-753.
APA	Shen, Jing-Xian.,Zhang, Yong-Jiang.,Maenpuen, Phisamai.,Zhang, Shu-Bin.,Zhang, Lan.,...&Chen, Ya-Jun.(2022).Response of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydrates.TREE PHYSIOLOGY,42(4),740-753.
MLA	Shen, Jing-Xian,et al."Response of four evergreen savanna shrubs to an incidence of extreme drought: high embolism resistance, branch shedding and maintenance of nonstructural carbohydrates".TREE PHYSIOLOGY 42.4(2022):740-753.

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