Leaf rehydration capacity: Associations with other indices of drought tolerance and environment

John, Grace P.; Henry, Christian; Sack, Lawren

doi:10.1111/pce.13390

Cited by 35 publications

(31 citation statements)

References 111 publications

(197 reference statements)

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“…It is well known that leaf thickness can contribute to desiccation tolerance, which has a positive relation to high dehydration tolerance (e.g. John et al 2018;Kenzo et al 2007Kenzo et al , 2019Niinemets 2001). High LMA also increases leaf heat capacity due to large water volume and may give drought and high temperature tolerance (Turner 2001).…”

Section: Discussionmentioning

confidence: 99%

Drainage effects on leaf traits of trees in tropical peat swamp forests in Central Kalimantan, Indonesia

Ichie

Yoneyama

Hashimoto

et al. 2019

Tropics

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Large areas of the tropical peat swamp forests in Central Kalimantan were drained to be converted into rice fields and then abandoned. A change in the soil water level due to drainage in the forests must have had a big impact on the ecology and ecophysiology of the trees in the drained remnant forests. The leaf traits of these trees in particular may have been directly or indirectly affected by drainage because of their high sensitivity to environmental change. To understand the influence of drainage on leaf traits, we investigated leaf morphological and physiological differences between intact and drained peat swamp forests in Palangka Raya, Indonesia, using 14 species distributed over both types of forests. We compared the leaf mass per unit area (LMA), leaf toughness, leaf area-and mass-based nitrogen content (N area and N mass), carbon/nitrogen ratio, total phenolics, condensed tannin and lignin content and carbon isotope ratio (13 C) of both types of forest trees. In the drained forest, trees had higher values in LMA, N area , and 13 C than in the intact forest, suggesting that such trees adjust themselves to dry conditions to increase photosynthetic ability with high water use efficiency compared with those in intact forests. We also found an increase in condensed tannin content in drained forest trees, which may offset the drainage-induced acceleration of leaf decomposition to some extent.

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Section: Discussionmentioning

confidence: 99%

Drainage effects on leaf traits of trees in tropical peat swamp forests in Central Kalimantan, Indonesia

Ichie

Yoneyama

Hashimoto

et al. 2019

Tropics

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“…We selected 15 morphologically and ecologically diverse tree and shrub species native to California semi-desert, chaparral, coastal scrub, and woodlands (Supplementary Data 2). Plants were cultivated in a greenhouse common garden at the UCLA Plant Growth Center from August 2012 to April 2016 56 . Nine individual seedlings of each species were acquired in 3.8 L pots (Tree of Life Nursery; San Juan Capistrano, CA), and randomized within each of nine blocks containing one individual of each species spread across four greenhouse benches in two greenhouse rooms.…”

Section: Methodsmentioning

confidence: 99%

“…Measurements were made of pressure–volume curves and of leaf structure, i.e., leaf dry mass per unit area (LMA), for the study plants 56 . For 6–9 plants per species, 5–6 leaves were measured for leaf water potential and leaf mass during dehydration and from the plotted pressure–volume curves, we determined water potential at full turgor ( π o ) and turgor loss point ( π tlp ) 59 .…”

Section: Methodsmentioning

confidence: 99%

A stomatal safety-efficiency trade-off constrains responses to leaf dehydration

et al. 2019

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Stomata, the microvalves on leaf surfaces, exert major influences across scales, from plant growth and productivity to global carbon and water cycling. Stomatal opening enables leaf photosynthesis, and plant growth and water use, whereas plant survival of drought depends on stomatal closure. Here we report that stomatal function is constrained by a safety-efficiency trade-off, such that species with greater stomatal conductance under high water availability ( g max ) show greater sensitivity to closure during leaf dehydration, i.e., a higher leaf water potential at which stomatal conductance is reduced by 50% (Ψ gs50 ). The g max - Ψ gs50 trade-off and its mechanistic basis is supported by experiments on leaves of California woody species, and in analyses of previous studies of the responses of diverse flowering plant species around the world. Linking the two fundamental key roles of stomata—the enabling of gas exchange, and the first defense against drought—this trade-off constrains the rates of water use and the drought sensitivity of leaves, with potential impacts on ecosystems.

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“…Recent studies used the leaf PLRC ( e.g. John et al, 2018; Trueba et al, 2019) to help in understanding the failure of leaf function under drought and to compare species for drought tolerance. Leaf PLRC was associated to cell damages, especially by the deregulation of reactive oxygen species homeostasis (Oppenheimer and Leshem, 1966; Sharma et al, 2012), but it was not related to plant survival.…”

Section: Discussionmentioning

confidence: 99%

Drought-induced mortality: stem diameter variation reveals a point of no return in lavender species

Lamacque

Charrier

Farnese

et al. 2019

Preprint

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In the context of climate changes, water availability is expected to severely decline. Consequently, there is a need to predict mortality of woody species, especially to find a physiological threshold to drought-induced mortality. Lavender species (Lavandula angustifolia and Lavandula x intermedia) which are important crops of the Mediterranean region are affected by a decline, notably caused by successive intense drought events. Lavender response to extreme drought events was monitored using continuous stem diameter measurements. Water potential, stomatal conductance, loss of xylem hydraulic conductivity and electrolyte leakage were also measured during desiccation, and recovery was evaluated after rewatering. Two parameters computed from stem diameter variations were related to stress intensity and resilience to stress: PLD (Percentage Loss of Diameter) and stem PLRC (Percentage Loss of Rehydration Capacity of the stem), respectively. We showed that plants did not recover when the PLD reached its maximal value (PLDmax) which was 21.27 ± 0.57% in both lavender species and whatever the growing conditions. This point of no return was associated with a high level of cell lysis evaluated by electrolyte leakage, and occurred far after the xylem hydraulic failure. We discussed the relevance of PLDmax as a threshold for drought-induced mortality and its physiological significance, in relation to the mortality mechanisms.One-sentence summaryUnder extreme drought, lavender death occurs when the water storage of the elastic compartment of the stem is exhausted.

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Leaf rehydration capacity: Associations with other indices of drought tolerance and environment

Cited by 35 publications

References 111 publications

Drainage effects on leaf traits of trees in tropical peat swamp forests in Central Kalimantan, Indonesia

Drainage effects on leaf traits of trees in tropical peat swamp forests in Central Kalimantan, Indonesia

A stomatal safety-efficiency trade-off constrains responses to leaf dehydration

Drought-induced mortality: stem diameter variation reveals a point of no return in lavender species

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