Hydraulic redistribution of foliar absorbed water causes turgor‐driven growth in mangrove seedlings

Schreel, Jeroen D. M.; Wal, Bart A.E. Van de; Hervé‐Fernández, Pedro; Boeckx, Pascal; Steppe, Kathy

doi:10.1111/pce.13556

Cited by 46 publications

(40 citation statements)

References 53 publications

(86 reference statements)

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“…FWU-capacity as quantified in this paper can be used to emphasize the general importance of FWU in certain biomes and to compare the relative importance between species. An overall assessment of the importance of FWU, indicating how much water is absorbed by leaves and used by trees, is best done with other methods, e.g., stable isotope tracing and sap flow measurements [34], although caution should be taken when performing isotopic experiments [35].…”

Section: Discussionmentioning

confidence: 99%

Influence of Drought on Foliar Water Uptake Capacity of Temperate Tree Species

Schreel

Crone

Kangur

et al. 2019

Forests

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Foliar water uptake (FWU) has been investigated in an increasing number of species from a variety of areas but has remained largely understudied in deciduous, temperate tree species from non-foggy regions. As leaf wetting events frequently occur in temperate regions, FWU might be more important than previously thought and should be investigated. As climate change progresses, the number of drought events is expected to increase, basically resulting in a decreasing number of leaf wetting events, which might make FWU a seemingly less important mechanism. However, the impact of drought on FWU might not be that unidirectional because drought will also cause a more negative tree water potential, which is expected to result in more FWU. It yet remains unclear whether drought results in a general increase or decrease in the amount of water absorbed by leaves. The main objectives of this study are, therefore: (i) to assess FWU-capacity in nine widely distributed key tree species from temperate regions, and (ii) to investigate the effect of drought on FWU in these species. Based on measurements of leaf and soil water potential and FWU-capacity, the effect of drought on FWU in temperate tree species was assessed. Eight out of nine temperate tree species were able to absorb water via their leaves. The amount of water absorbed by leaves and the response of this plant trait to drought were species-dependent, with a general increase in the amount of water absorbed as leaf water potential decreased. This relationship was less pronounced when using soil water potential as an independent variable. We were able to classify species according to their response in FWU to drought at the leaf level, but this classification changed when using drought at the soil level, and was driven by iso- and anisohydric behavior. FWU hence occurred in several key tree species from temperate regions, be it with some variability, which potentially allows these species to partly reduce the effects of drought stress. We recommend including this mechanism in future research regarding plant–water relations and to investigate the impact of different pathways used for FWU.

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Section: Discussionmentioning

confidence: 99%

Influence of Drought on Foliar Water Uptake Capacity of Temperate Tree Species

Schreel

Crone

Kangur

et al. 2019

Forests

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“…We tested two novel hypotheses in Avicennia marina , a mangrove species that exhibits SSWU (Nguyen et al ., ; Schreel et al ., ): that (1) K surf declines with decreasing leaf water potential and (2) K leaf recovers overnight through SSWU.…”

Section: Introductionmentioning

confidence: 96%

Shoot surface water uptake enables leaf hydraulic recovery in Avicennia marina

et al. 2019

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The significance of shoot surface water uptake (SSWU) has been debated, and it would depend on the range of conditions under which it occurs. We hypothesized that the decline of leaf hydraulic conductance (K leaf ) in response to dehydration may be recovered through SSWU, and that the hydraulic conductance to SSWU (K surf ) declines with dehydration.We quantified effects of leaf dehydration on K surf and effects of SSWU on recovery of K leaf in dehydrated leaves of Avicennia marina.SSWU led to overnight recovery of K leaf , with recovery retracing the same path as loss of K leaf in response to dehydration. SSWU declined with dehydration. By contrast, K surf declined with rehydration time but not with dehydration.Our results showed a role of SSWU in the recovery of leaf hydraulic conductance and revealed that SSWU is sensitive to leaf hydration status. The prevalence of SSWU in vegetation suggests an important role for atmospheric water sources in maintenance of leaf hydraulic function, with implications for plant responses to changing environments.

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“…The ability of this mechanism to contribute to plant-water relationships has been highly species dependent, ranging from an inability to absorb water through leaves (Limm et al, 2009) to essential for turgor-driven stem diameter growth (Steppe et al, 2018;Schreel et al, 2019b), and is known to vary within the same species as a function of environmental drivers (Limm and Dawson, 2010). It is generally expected that the positive effects of FWU on tree hydraulics from sources such as morning dew would be more beneficial during drought compared to well-watered conditions Steppe, 2019, 2020), as recently been shown for temperate species by Schreel et al (2019a).…”

Section: Introductionmentioning

confidence: 99%

Identifying the pathways for foliar water uptake in beech (Fagus sylvatica L.): a major role for trichomes

et al. 2020

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SUMMARY Foliar water uptake (FWU), the direct uptake of water into leaves, is a global phenomenon, having been observed in an increasing number of plant species. Despite the growing recognition of its functional relevance, our understanding of how FWU occurs and which foliar surface structures are implicated, is limited. In the present study, fluorescent and ionic tracers, as well as microcomputed tomography, were used to assess potential pathways for water entry in leaves of beech, a widely distributed tree species from European temperate regions. Although none of the tracers entered the leaf through the stomatal pores, small amounts of silver precipitation were observed in some epidermal cells, indicating moderate cuticular uptake. Trichomes, however, were shown to absorb and redistribute considerable amounts of ionic and fluorescent tracers. Moreover, microcomputed tomography indicated that 72% of empty trichomes refilled during leaf surface wetting and microscopic investigations revealed that trichomes do not have a cuticle but are covered with a pectin‐rich cell wall layer. Taken together, our findings demonstrate that foliar trichomes, which exhibit strong hygroscopic properties as a result of their structural and chemical design, constitute a major FWU pathway in beech.

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Hydraulic redistribution of foliar absorbed water causes turgor‐driven growth in mangrove seedlings

Cited by 46 publications

References 53 publications

Influence of Drought on Foliar Water Uptake Capacity of Temperate Tree Species

Influence of Drought on Foliar Water Uptake Capacity of Temperate Tree Species

Shoot surface water uptake enables leaf hydraulic recovery in Avicennia marina

Identifying the pathways for foliar water uptake in beech (Fagus sylvatica L.): a major role for trichomes

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