Leaf hydraulic safety margin and safety–efficiency trade-off across angiosperm woody species

Yan, Chao-Long; Ni, Ming-Yuan; Cao, Kaihua; Zhu, Shidan

doi:10.1098/rsbl.2020.0456

Cited by 15 publications

(16 citation statements)

References 42 publications

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“…That is, desert shrubs with more negative Y md and larger DY were more resistant to embolism, e.g., H. ammodendron. Moreover, the shrubs with lower DY and Y md had more negative P 50 and higher K max , suggesting that the shrubs with smaller minimal leaf water potential and higher leaf hydraulic safety have lower leaf hydraulic efficiency, which was consistent with the results of previous studies (Nardini and Luglio, 2014;Yan et al, 2020;Liu et al, 2021). The minimal leaf water potential was coordinated with leaf hydraulic safety, whereas it exhibited a trade-off with leaf hydraulic efficiency; therefore, minimal leaf water potential seems to act as a mediator in the trade-off with leaf hydraulic efficiency and in coordination with leaf hydraulic safety.…”

Section: Coordination Among Leaf Hydraulic Functional Traits In Deser...supporting

confidence: 91%

“…In the past decade, the trade-off between hydraulic safety and efficiency has been widely investigated ( Nardini and Luglio, 2014 ; Bucci et al., 2019 ). Some studies across woody angiosperms and gymnosperms globally have revealed weak trade-offs between K max and P 50 ( Gleason et al., 2016 ; Yan et al., 2020 ; Liu et al., 2021 ). However, the evidence of a significant correlation between K max and P 50 in this study indicated that the hydraulic safety and efficiency of desert shrubs exhibit a strong trade-off (R 2 = 0.567, p = 0.031).…”

Section: Discussionmentioning

confidence: 99%

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Hydraulic trade-off and coordination strategies mediated by leaf functional traits of desert shrubs

et al. 2022

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Desert shrubs play important roles in desertification control and vegetation restoration, which are particularly affected by droughts caused by climate change. However, the hydraulic strategies associated with hydraulic functional traits of desert shrubs remain unclear. Here, eight desert shrub species with different life forms and morphologies were selected for a common garden experiment at the southeast edge of the Tengger Desert in northern China to study the hydraulic strategies mediated by leaf hydraulic functional traits. Diurnal leaf water potential change, leaf hydraulic efficiency and safety, hydraulic safety margin, hydraulic capacitance, and water potential and relative water content at the turgor loss point were observed to significantly differ among species, suggesting that leaf hydraulic functional traits were strongly associated with species even when living in the same environment. Additionally, shrubs with greater leaf hydraulic efficiency had lower midday leaf water potential and leaf hydraulic safety, suggesting that leaf hydraulic efficiency had a strong trade-off with hydraulic safety and minimum leaf water potential, whereas there was also a coordination between leaf hydraulic safety and the leaf minimal water potential. Moreover, shrubs with higher leaf hydraulic capacitance had greater hydraulic safety margins, indicating coordination between leaf hydraulic capacitance and hydraulic safety margin. Overall, this study indicated that minimal daily leaf water potential, as an easily measured parameter, may be used preliminarily to predict leaf hydraulic conductivity and the resistance to embolism of desert shrubs, providing critical insights into hydraulic trade-off and coordination strategies for native shrubs as priority species in desert vegetation restoration and reconstruction.

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Section: Coordination Among Leaf Hydraulic Functional Traits In Deser...supporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Hydraulic trade-off and coordination strategies mediated by leaf functional traits of desert shrubs

et al. 2022

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“…This point is critical because, traditionally, the VC is assumed to be static, and the HSM is evaluated based on a single estimation of the VC, combined with a dynamic determination of Ψ x . Many studies do not even report the time of the VC measurement (Benson et al, 2022;Skelton et al, 2018) and the large hydraulic databases (Choat et al, 2012;Lens et al, 2016;Yan et al, 2020) do not report the sampling time.…”

Section: Implication For Evaluating Plant Hsmsmentioning

confidence: 99%

Seasonal adjustment of leaf embolism resistance and its importance for hydraulic safety in deciduous trees

Sorek

Greenstein

Hochberg

2022

Physiologia Plantarum

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Embolism resistance is often viewed as seasonally stable. Here we examined the seasonality in the leaf xylem vulnerability curve (VC) and turgor loss point (ΨTLP) of nine deciduous species that originated from Mediterranean, temperate, tropical, or sub‐tropical habitats and were growing on the Volcani campus, Israel. All four Mediterranean/temperate species exhibited a shift of their VC to lower xylem pressures (Ψx) along the dry season, in addition to two of the five tropical/sub‐tropical species. In three of the species that exhibited VC seasonality, it was critical for avoiding embolism in the leaf. In total, seven out of the nine species avoided embolism. The seasonal VC adjustment was over two times higher as compared with the seasonal adjustment of ΨTLP, resulting in improved hydraulic safety as the season progressed. The results suggest that seasonality in the leaf xylem vulnerability is common in species that originate from Mediterranean or temperate habitats that have large seasonal environmental changes. This seasonality is advantageous because it enables a gradual seasonal reduction in the Ψx without increasing the danger of embolism. The results also highlight that measuring the minimal Ψx and the VC at different times can lead to erroneous estimations of the hydraulic safety margins. Changing the current hydraulic dogma into a seasonal dynamic in the vulnerability of the xylem itself should enable physiologists to understand plants' responses to their environment better.

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“…2016; Yan et al . 2020). HSM estimations for a large number of species within a vegetation area provide useful information about the plant water status and potential risk of embolism formation, which can also contribute to drought‐induced mortality (Anderegg et al .…”

Section: Introductionmentioning

confidence: 99%

“…Positive HSM values could be maintained by the evolution of embolism-resistant xylem (more negative P 50 ) or by controlling Ψ min through low stomatal conductance, leaf shedding and/or developing deep roots (Hochberg et al 2017;Oliveira et al 2021). Moreover, the HSM concept has been applied to both stems (Choat et al 2012;Ziegler et al 2019) and leaves (Zhu et al 2016;Yan et al 2020). HSM estimations for a large number of species within a vegetation area provide useful information about the plant water status and potential risk of embolism formation, which can also contribute to drought-induced mortality (Anderegg et al 2016;Powers et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Stem and leaf xylem of angiosperm trees experiences minimal embolism in temperate forests during two consecutive summers with moderate drought

et al. 2022

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Drought events may increase the likelihood that the plant water transport system becomes interrupted by embolism. Yet our knowledge about the temporal frequency of xylem embolism in the field is frequently lacking, as it requires detailed, long‐term measurements. We measured xylem embolism resistance and midday xylem water potentials during the consecutive summers of 2019 and 2020 to estimate maximum levels of embolism in leaf and stem xylem of ten temperate angiosperm tree species. We also studied vessel and pit membrane characteristics based on light and electron microscopy to corroborate potential differences in embolism resistance between leaves and stems. Apart from A. pseudoplatanus and Q. petraea, eight species experienced minimum xylem water potentials that were close to or below those required to initiate embolism. Water potentials corresponding to ca. 12% loss of hydraulic conductivity (PLC) could occur in six species, while considerable levels of embolism around 50% PLC were limited to B. pendula and C. avellana. There was a general agreement in embolism resistance between stems and leaves, with leaves being equally or more resistant than stems. Also, xylem embolism resistance was significantly correlated to intervessel pit membrane thickness (TPM) for stems, but not to vessel diameter and total intervessel pit membrane surface area of a vessel. Our data indicate that low amounts of embolism occur in most species during moderate summer drought, and that considerable levels of embolism are uncommon. Moreover, our experimental and TPM data show that leaf xylem is generally no more vulnerable than stem xylem.

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Leaf hydraulic safety margin and safety–efficiency trade-off across angiosperm woody species

Cited by 15 publications

References 42 publications

Hydraulic trade-off and coordination strategies mediated by leaf functional traits of desert shrubs

Hydraulic trade-off and coordination strategies mediated by leaf functional traits of desert shrubs

Seasonal adjustment of leaf embolism resistance and its importance for hydraulic safety in deciduous trees

Stem and leaf xylem of angiosperm trees experiences minimal embolism in temperate forests during two consecutive summers with moderate drought

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