气候变化领域集成服务门户(CCPortal): Quantifying turgor loss point and leaf water potential across contrasting Eucalyptus clones and sites within the TECHS research platform

CCPortal

DOI	10.1016/j.foreco.2020.118454
	Quantifying turgor loss point and leaf water potential across contrasting Eucalyptus clones and sites within the TECHS research platform
	Luiz Ferraresso Conti Junior J.; José de Araujo M.; Cesar de Paula R.; Barroso Queiroz T.; Eiji Hakamada R.; Hubbard R.M.
发表日期	2020
ISSN	0378-1127
卷号	475
英文摘要	Understanding the mechanisms governing drought tolerance in highly productive clonal Eucalyptus plantations in Brazil will become increasingly important with climate change driven increases in temperature and drought events. We quantified how leaf water potential, hydraulic safety margin (mid-day – pre-dawn leaf water potential, Ψδ) and the physiological parameters obtained from standard pressure–volume curves differed between four contrasting Eucalyptus genotypes across a temperature and water availability gradient in Brazil. We hypothesized that genotypes developed in dry areas were more drought tolerant and would exhibit lower mid-day leaf water potentials and turgor loss points than clones developed in wetter regions. Recognizing that standard pressure volume curves are time consuming and may not be a suitable screening tool for forest managers, we also tested if a key physiological parameter from the pressure–volume curve (turgor loss point, πtlp) could be accurately estimated from an osmometer as has been found in other species. We found no support for our first hypothesis; physiological parameters determined (including turgor loss point) from the pressure volume curves were not associated with the supposed drought tolerance of any of the clones. Similarly, mid-day leaf water potentials were not directly correlated with drought tolerance. The lack of support for our hypothesis may be because our measurements were taken during periods of minimum water stress. However, we did find that, overall, turgor loss point tended to be lower at the dry compared to wetter sites we studied suggesting that it may be a useful tool for assessing drought tolerance of Eucalyptus plantations in the future. We also found that estimates of osmotic potential at full turgor were similar between the pressure volume curve and osmometer techniques and that turgor loss point can be accurately estimated with an osmometer in highly productive Eucalyptus genotypes (R2 = 0.79). © 2020 Elsevier B.V.
英文关键词	Ecophysiology; Eucalyptus; Forest breeding; Water stress
语种	英语
scopus关键词	Agronomy; Climate change; Cloning; Forestry; Osmosis; Physiological models; Physiology; Plants (botany); Drought tolerances; Eucalyptus plantations; Leaf water potential; Physiological parameters; Pre-dawn leaf water potentials; Pressure-volume curves; Research platforms; Water availability; Drought; climate change; drought; evergreen tree; genotype; instrumentation; measurement method; physiological response; safety; water availability; water content; Agronomy; Drought; Eucalyptus; Forestry; Osmosis; Physiology; Tolerance; Water; Brazil; Eucalyptus
来源期刊	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/155021
作者单位	São Paulo State University (Unesp), College of Agricultural Sciences, Brazil; Federal Rural University of Pernambuco – UFRPE, Brazil; USDA Forest Service, Rocky Mountain Research Station, United States
推荐引用方式 GB/T 7714	Luiz Ferraresso Conti Junior J.,José de Araujo M.,Cesar de Paula R.,et al. Quantifying turgor loss point and leaf water potential across contrasting Eucalyptus clones and sites within the TECHS research platform[J],2020,475.
APA	Luiz Ferraresso Conti Junior J.,José de Araujo M.,Cesar de Paula R.,Barroso Queiroz T.,Eiji Hakamada R.,&Hubbard R.M..(2020).Quantifying turgor loss point and leaf water potential across contrasting Eucalyptus clones and sites within the TECHS research platform.Forest Ecology and Management,475.
MLA	Luiz Ferraresso Conti Junior J.,et al."Quantifying turgor loss point and leaf water potential across contrasting Eucalyptus clones and sites within the TECHS research platform".Forest Ecology and Management 475(2020).