Foliar water uptake in arid ecosystems: seasonal variability and ecophysiological consequences

Cavallaro, Agustín; Silleta, Luisina Carbonell; Pereyra, Diego; Goldstein, Guillermo; Scholz, Fabián Gustavo; Bucci, Sandra Janet

doi:10.1007/s00442-020-04673-1

Cited by 38 publications

(40 citation statements)

References 47 publications

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“…It must be, however, mentioned that in that study leaves were younger (collected in May) than in the present study (collected in September), leading to differences in P. dulcis FWU parameters (e.g., R min of intact leaves was ~660 vs. ~1,000 MPa m 2 s g −1 in May and September, respectively). Such a discrepancy might indicate that FWU is influenced by temporal changes in leaf surface properties, as reported by Cavallaro, Pereyra, Goldstein, Scholz, and Bucci (2020). Even if open stomata facilitate FWU, the rates are still orders of magnitude lower than the hydraulic suction via the petiole, which suggests that a simple flow of liquid water into the leaf via stomata does not occur.…”

Section: Discussionmentioning

confidence: 78%

“…Such a discrepancy might indicate that FWU is influenced by temporal changes in leaf surface properties, as reported by Cavallaro, Pereyra, Goldstein, Scholz, and Bucci (2020). Even if open stomata facilitate FWU, the rates are still orders of magnitude lower than the hydraulic suction via the petiole, which suggests that a simple flow of liquid water into the leaf via stomata does not occur.…”

Section: Ultrastructure Of the Stomata And The Cuticle -Tem Microscopymentioning

confidence: 88%

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Unravelling foliar water uptake pathways: The contribution of stomata and the cuticle

Guzmán‐Delgado

Laca

Zwieniecki

2021

Plant Cell & Environment

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Plants can absorb water through their leaf surfaces, a phenomenon commonly referred to as foliar water uptake (FWU). Despite the physiological importance of FWU, the pathways and mechanisms underlying the process are not well known.Using a novel experimental approach, we parsed out the contribution of the stomata and the cuticle to FWU in two species with Mediterranean (Prunus dulcis) and temperate (Pyrus communis) origin. The hydraulic parameters of FWU were derived by analysing mass and water potential changes of leaves placed in a fog chamber. Leaves were previously treated with abscisic acid to force stomata to remain closed, with fusicoccin to remain open, and with water (control). Leaves with open stomata rehydrated two times faster than leaves with closed stomata and attained approximately three times higher maximum fluxes and hydraulic conductance. Based on FWU rates, we propose that rehydration through stomata occurs primarily via diffusion of water vapour rather than in liquid form even when leaf surfaces are covered with a water film. We discuss the potential mechanisms of FWU and the significance of both stomatal and cuticular pathways for plant productivity and survival.

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Section: Discussionmentioning

confidence: 78%

Section: Ultrastructure Of the Stomata And The Cuticle -Tem Microscopymentioning

confidence: 88%

Unravelling foliar water uptake pathways: The contribution of stomata and the cuticle

Guzmán‐Delgado

Laca

Zwieniecki

2021

Plant Cell & Environment

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“…We found comparatively low levels of foliar water uptake inside the tree island communities (CWM of FWU of 15.17%) compared to measurements of grass and shrub species in the Campos de Altitude (mean FWU of 73.6%) by Matos et al (2020). On the one hand, this could be associated with differences in rooting depths, as species with shallow roots, like many grasses and shrubs, show higher capacity for FWU than species with deep roots which have better allyear-around water access (Cavallaro et al, 2020). On the other hand, this could be another proof of facilitation, since in the tree islands drought buffering due to sheltering effects could be at play, resulting in a lower need for alternative mechanisms of water acquisition.…”

Section: The Functional Assembly Inside Versus Outside the Tree Islandmentioning

confidence: 94%

Functional assembly of tropical montane tree islands in the Atlantic Forest is shaped by stress tolerance, bamboo presence, and facilitation

Christmann

Rosado

Delhaye

et al. 2021

Ecology and Evolution

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Aims: Amidst the Campos de Altitude (Highland Grasslands) in the Brazilian Atlantic Forest, woody communities grow either clustered in tree islands or interspersed within the herbaceous matrix. The functional ecology, diversity, and biotic processes shaping these plant communities are largely unstudied. We characterized the functional assembly and diversity of these tropical montane woody communities and investigated how they fit within Grime's CSR (C-competitor, S-stress-tolerant, Rruderal) scheme, what functional trade-offs they exhibit, and how traits and functional diversity vary in response to bamboo presence/absence. Methods:To characterize the functional composition of the community, we sampled five leaf traits and wood density along transects covering the woody communities both inside tree islands and outside (i.e., isolated woody plants in the grasslands community). Then, we used Mann-Whitney test, t test, and variation partitioning to determine the effects of inside versus outside tree island and bamboo presence on community-weighted means, woody species diversity, and functional diversity. Results:We found a general SC/S strategy with drought-related functional tradeoffs. Woody plants in tree islands had more acquisitive traits than those within the grasslands. Trait variation was mostly taxonomically than spatially driven, and species composition varied between inside and outside tree islands. Leaf thickness, wood density, and foliar water uptake were unrelated to CSR strategies, suggesting independent trait dimensions and multiple drought-coping strategies within the predominant S strategy. Islands with bamboo presence showed lower Simpson diversity, lower functional dispersion, lower foliar water uptake, and greater leaf thickness than in tree islands without bamboo. Conclusions:The observed functional assembly hints toward large-scale environmental abiotic filtering shaping a stress-tolerant community strategy, and small-scale biotic interactions driving small-scale trait variation. We recommend | 10165 CHRISTMANN eT Al.

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“…R min of intact leaves was 660 vs˜1,000 MPa m 2 s g -1 in May and September, respectively). Such a discrepancy might indicate that FWU is influenced by temporal changes in leaf surface properties, as reported by Cavallaro et al (2020). Even if open stomata facilitate FWU, the rates are still orders of magnitude lower than the hydraulic suction via the petiole, which suggests that a simple flow of liquid water into the leaf via stomata does not occur.…”

Section: Mechanisms Of Fwumentioning

confidence: 88%

Unraveling foliar water uptake pathways: the contribution of stomata and the cuticle

Guzmán‐Delgado

Laca

Zwieniecki

2020

Preprint

View full text Add to dashboard Cite

Plants can absorb water through their leaf surfaces, a phenomenon commonly referred to as foliar water uptake (FWU). Despite the physiological importance of FWU, the pathways and mechanisms underlying the process are not well known. Using a novel experimental approach, we parsed out the contribution of the stomata and the cuticle to FWU in two species with Mediterranean (Prunus dulcis) and temperate (Pyrus communis) origin. The hydraulic parameters of FWU were derived by analyzing mass and water potential changes of leaves placed in a fog chamber. Leaves were previously treated with abscisic acid to force stomata to remain closed, with fusicoccin to remain open, and with water (control). Leaves with open stomata rehydrated two times faster than leaves with closed stomata and attained three to four times higher maximum fluxes and hydraulic conductance. Based on FWU rates, we propose that rehydration through stomata occurs primarily via diffusion of water vapor rather than in liquid form even when leaf surfaces are covered with a water film. We discuss the potential mechanisms of FWU and the significance of both stomatal and cuticular pathways for plant productivity and survival.

show abstract

Foliar water uptake in arid ecosystems: seasonal variability and ecophysiological consequences

Cited by 38 publications

References 47 publications

Unravelling foliar water uptake pathways: The contribution of stomata and the cuticle

Unravelling foliar water uptake pathways: The contribution of stomata and the cuticle

Functional assembly of tropical montane tree islands in the Atlantic Forest is shaped by stress tolerance, bamboo presence, and facilitation

Unraveling foliar water uptake pathways: the contribution of stomata and the cuticle

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