干旱区生态环境知识资源中心(Arid): Leaf membrane leakage and xylem hydraulic failure define the point of no return in drought-induced tree mortality in Cupressus sempervirens

Arid

DOI	10.1111/ppl.14467
	Leaf membrane leakage and xylem hydraulic failure define the point of no return in drought-induced tree mortality in Cupressus sempervirens
	Alon, Asaf; Cohen, Shabtai; Burlett, Regis; Eselson, Elena; Riov, Joseph; Delzon, Sylvain; David-Schwartz, Rakefet
通讯作者	Alon, A ; David-Schwartz, R
来源期刊	PHYSIOLOGIA PLANTARUM
ISSN	0031-9317
EISSN	1399-3054
出版年	2024
卷号	176 期号:4
英文摘要	Measurements of resistance to embolism suggest that Cupressus sempervirens has a stem xylem that resists embolism at very negative water potentials, with 50% embolism (P-50) at water potentials of approximately -10 MPa. However, field observations in a semi-arid region suggest tree mortality occurs before 10% embolism. To explore the interplay between embolism and plant mortality, we conducted a controlled drought experiment involving two types of CS seedlings: a local seed source (S-type) and a drought-resistant clone propagated from a semi-arid forest (C-type). We measured resistance to embolism, leaf relative water content (RWC), water potential, photosynthesis, electrolyte leakage (EL), plant water loss, leaf hydraulic conductivity, and leaf non-structural carbohydrate (NSC) content during plant dehydration and before rewatering. All measured individuals were monitored for survival or mortality. While the S- and C-types differed in P-50, transpiration, and mortality rates, both displayed seedling mortality corresponding to threshold values of 52-55% leaf RWC, 55% and 18.5% percent loss of conductivity (PLC) in the xylem, which corresponds to 48% and 37% average EL values for S and C types, respectively. Although C-type C. sempervirens NSC content increased in response to drought, no differences were observed in NSC content between live and dead seedlings of both types. Our findings do not fully explain tree mortality in the field but they do indicate that loss of membrane integrity occurs before or at xylem water potential, leading to hydraulic failure.
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001290988300001
WOS关键词	WATER-STRESS ; PHYSIOLOGICAL-MECHANISMS ; PLANT MORTALITY ; GROWTH ; VULNERABILITY ; TOLERANCE ; CAVITATION ; RESISTANCE ; DEPLETION ; PRESSURE
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/405067
推荐引用方式 GB/T 7714	Alon, Asaf,Cohen, Shabtai,Burlett, Regis,et al. Leaf membrane leakage and xylem hydraulic failure define the point of no return in drought-induced tree mortality in Cupressus sempervirens[J],2024,176(4).
APA	Alon, Asaf.,Cohen, Shabtai.,Burlett, Regis.,Eselson, Elena.,Riov, Joseph.,...&David-Schwartz, Rakefet.(2024).Leaf membrane leakage and xylem hydraulic failure define the point of no return in drought-induced tree mortality in Cupressus sempervirens.PHYSIOLOGIA PLANTARUM,176(4).
MLA	Alon, Asaf,et al."Leaf membrane leakage and xylem hydraulic failure define the point of no return in drought-induced tree mortality in Cupressus sempervirens".PHYSIOLOGIA PLANTARUM 176.4(2024).