Foliar uptake, carbon fluxes and water status are affected by the timing of daily fog in saplings from a threatened cloud forest

Berry, Z. Carter; White, Joseph C.; Smith, William K.

doi:10.1093/treephys/tpu032

Cited by 64 publications

(57 citation statements)

References 36 publications

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“…Both Eller et al () and Cassana et al (2016) find evidence that water from FWU was transported to soil in seedlings of a tropical evergreen ( Drimys brasiliensis ) and a southern hemisphere conifer ( Araucaria angustifolia ) in Brazil. However, Limm et al () and Berry, White, and Smith () conducted similar studies and did not find any signal of FWU water in the soil in seedlings from temperate California Redwoods (10 herbaceous and tree species) and in Appalachian montane conifer forests (canopy conifers), respectively. Notably, recent research has demonstrated that stable isotopes of water alone cannot be used as tracers to establish the net uptake of water by FWU, due to the possibility of bidirectional exchange of water isotopes between the leaf and the atmosphere (Goldsmith, Lehmann, Cernusak, Arend, & Siegwolf, ).…”

Section: Pathways Of Water Movementmentioning

confidence: 85%

Foliar water uptake: Processes, pathways, and integration into plant water budgets

Berry

Emery

Gotsch

et al. 2018

Plant Cell & Environment

188

179

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Nearly all plant families, represented across most major biomes, absorb water directly through their leaves. This phenomenon is commonly referred to as foliar water uptake. Recent studies have suggested that foliar water uptake provides a significant water subsidy that can influence both plant water and carbon balance across multiple spatial and temporal scales. Despite this, our mechanistic understanding of when, where, how, and to what end water is absorbed through leaf surfaces remains limited. We first review the evidence for the biophysical conditions necessary for foliar water uptake to occur, focusing on the plant and atmospheric water potentials necessary to create a gradient for water flow. We then consider the different pathways for uptake, as well as the potential fates of the water once inside the leaf. Given that one fate of water from foliar uptake is to increase leaf water potentials and contribute to the demands of transpiration, we also provide a quantitative synthesis of observed rates of change in leaf water potential and total fluxes of water into the leaf. Finally, we identify critical research themes that should be addressed to effectively incorporate foliar water uptake into traditional frameworks of plant water movement.

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Section: Pathways Of Water Movementmentioning

confidence: 85%

Foliar water uptake: Processes, pathways, and integration into plant water budgets

Berry

Emery

Gotsch

et al. 2018

Plant Cell & Environment

188

179

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“…, top and middle panels; Simonin et al ., ). Similar results have been observed in tropical and temperate montane cloud forest trees (Eller et al ., ; Berry et al ., ). Moreover, although there is now strong evidence that photosynthesis can be sustained by transient leaf wetting events, there is also emerging evidence suggesting that the immediate effects of leaf wetting on photosynthesis may vary considerably among species.…”

Section: The Real and Potential Benefits Of Leaf Wettingmentioning

confidence: 97%

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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“…The occurrence of water entering leaves directly from the atmosphere has two major implications, the first being that it increases the total amount of water available to the plant, and by extension, the amount of carbon assimilated (Berry, White, & Smith, 2014;Oliveira, Eller, Bittencourt, & Mulligan, 2014). The second implication is that water entering at the top of the system can effectively act independently of the cohesion-tension theory-that is, it enables water pressure in the canopy xylem to be above the theoretical maximum pressure based on water supply from the soil (Goldsmith, 2013)-and hypothetically even achieve positive pressures.…”

Section: Introductionmentioning

confidence: 99%

Foliar water uptake in Amazonian trees: Evidence and consequences

Binks

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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Foliar uptake, carbon fluxes and water status are affected by the timing of daily fog in saplings from a threatened cloud forest

Cited by 64 publications

References 36 publications

Foliar water uptake: Processes, pathways, and integration into plant water budgets

Foliar water uptake: Processes, pathways, and integration into plant water budgets

The value of wet leaves

Foliar water uptake in Amazonian trees: Evidence and consequences

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