Cloud forest trees with higher foliar water uptake capacity and anisohydric behavior are more vulnerable to drought and climate change

Eller, Cleiton B.; Lima, Aline L.; Oliveira, Rafael S.

doi:10.1111/nph.13952

Cited by 103 publications

(123 citation statements)

References 80 publications

(132 reference statements)

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“…As observed here, the intense penetration of LY in the trichomes after 1 h indicates the important role of trichomes in leaf water absorption, agreeing with previous experiments with non‐glandular trichomes of E. erythropappus and peltate glandular trichomes of Myrsine umbellata (Eller et al . ). Glandular trichomes, typically related to glandular secretion, were also stained with LY, indicating water absorption (Fahn , ).…”

Section: Discussionmentioning

confidence: 97%

“…In this study, the LY, an apoplastic marker, entered the cuticle, trichomes and epidermal cells of E. erythropappus and M. corallina , with no observation of fluorescence in secondary vascular bundles after 1 h. Nevertheless, LY reached the vascular bundles of E. erythropappus after 24 h of exposure (Eller et al . ), which denotes a low rate of leaf absorption in this species. As observed here, the intense penetration of LY in the trichomes after 1 h indicates the important role of trichomes in leaf water absorption, agreeing with previous experiments with non‐glandular trichomes of E. erythropappus and peltate glandular trichomes of Myrsine umbellata (Eller et al .…”

Section: Discussionmentioning

confidence: 99%

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Strategies of leaf water uptake based on anatomical traits

et al. 2018

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The ability of leaves to absorb fog water can positively contribute to the water and carbon balance of plants in montane ecosystems, especially in periods of soil water deficit. However, the ecophysiological traits and mechanisms responsible for variations in the speed and total water absorption capacity of leaves are still poorly known. This study investigated leaf anatomical attributes of seven species occurring in seasonal tropical high-altitude ecosystems (rocky outcrop and forest), which could explain differences in leaf water uptake (LWU) capacities. We tested the hypothesis that different sets of anatomical leaf attributes will be more marked in plant individuals living under these contrasting environmental conditions. Anatomical variations will affect the initial rate of water absorption and the total storage capacity, resulting in different strategies for using the water supplied by fog events. Water absorption by leaves was inferred indirectly, based on leaf anatomical structure and visual observation of the main access routes (using an apoplastic marker), the diffusion of water through the cuticle, and non-glandular or glandular trichomes in all species. The results suggest that three LWU strategies coexist in the species studied. The different anatomical patterns influenced the speed and maximum LWU capacity. The three LWU strategies can provide different adaptive advantages to adjust to temporal and spatial variations of water availability in these tropical high-altitude environments.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Strategies of leaf water uptake based on anatomical traits

et al. 2018

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“…Regardless of the pathways of foliar water uptake, it is clear that water absorbed directly by leaves improves leaf water status (Limm et al ., ; Eller et al ., , ; Goldsmith et al ., ). A particularly striking example is evident in the California redwoods ( Sequoia sempervirens ), in which leaf wetting occurring as a function of coastal fog events improves the water status of leaves in extremely tall (> 100 m), and thus particularly water‐limited, canopies (Burgess & Dawson, ; Simonin et al ., ).…”

Section: The Real and Potential Benefits Of Leaf Wettingmentioning

confidence: 99%

The value of wet leaves

2018

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Contents Summary 1156 I. Introduction 1156 II. How often are leaves wet? 1157 III. The costs of leaf wetting 1157 IV. The real and potential benefits of leaf wetting 1161 V. Wet leaves: costs, benefits and tradeoffs in a changing world 1165 Acknowledgements 1166 References 1166 SUMMARY: An often-overlooked feature of all plants is that their leaf surfaces are wet for significant periods over their lifetimes. Leaf wetting has a number of direct and indirect effects on plant function from the scale of the leaf to that of the ecosystem. The costs of leaf wetting for plant function, such as the growth of pathogens and the leaching of nutrients, have long been recognized. However, an emerging body of research has also begun to demonstrate some very clear benefits. For instance, leaf wetting can improve plant-water relations and lead to increased photosynthesis. Leaf wetting may also lead to synergistic effects on plant function, such as when leaf water potential improvements lead to enhanced growth that does not occur when plant leaves are dry. We identify important reasons why leaf wetting can be critical for plant sciences to not only acknowledge, but also directly address, in future research. To do so, we provide a framework for the consideration of the relative balance of the various costs and benefits resulting from leaf wetting, as well as how this balance may be expected to change given projected scenarios of global climate change in the future.

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“…Relatively little is known about k fu , but it is likely to vary by canopy position, leaf side (Fernandez et al, 2014) and species (Supporting Information Appendix S2: Figure 1; Eller, Lima, & Oliveira, 2016, Limm et al, 2009. Principally, these are obtaining a reliable mean for canopy k fu , determining what proportion of the canopy is wet, and for how long.…”

Section: How Can We More Accurately Quantify the Contribution Of Fumentioning

confidence: 99%

Foliar water uptake in Amazonian trees: Evidence and consequences

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Mencuccini

Rowland

et al. 2019

Global Change Biology

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The absorption of atmospheric water directly into leaves enables plants to alleviate the water stress caused by low soil moisture, hydraulic resistance in the xylem and the effect of gravity on the water column, while enabling plants to scavenge small inputs of water from leaf‐wetting events. By increasing the availability of water, and supplying it from the top of the canopy (in a direction facilitated by gravity), foliar uptake (FU) may be a significant process in determining how forests interact with climate, and could alter our interpretation of current metrics for hydraulic stress and sensitivity. FU has not been reported for lowland tropical rainforests; we test whether FU occurs in six common Amazonian tree genera in lowland Amazônia, and make a first estimation of its contribution to canopy–atmosphere water exchange. We demonstrate that FU occurs in all six genera and that dew‐derived water may therefore be used to “pay” for some morning transpiration in the dry season. Using meteorological and canopy wetness data, coupled with empirically derived estimates of leaf conductance to FU (kfu), we estimate that the contribution by FU to annual transpiration at this site has a median value of 8.2% (103 mm/year) and an interquartile range of 3.4%–15.3%, with the biggest sources of uncertainty being kfu and the proportion of time the canopy is wet. Our results indicate that FU is likely to be a common strategy and may have significant implications for the Amazon carbon budget. The process of foliar water uptake may also have a profound impact on the drought tolerance of individual Amazonian trees and tree species, and on the cycling of water and carbon, regionally and globally.

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Cloud forest trees with higher foliar water uptake capacity and anisohydric behavior are more vulnerable to drought and climate change

Cited by 103 publications

References 80 publications

Strategies of leaf water uptake based on anatomical traits

Strategies of leaf water uptake based on anatomical traits

The value of wet leaves

Foliar water uptake in Amazonian trees: Evidence and consequences

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