Leaf hydraulic vulnerability triggers the decline in stomatal and mesophyll conductance during drought in rice

Wang, Xiaoxiao; Du, Tingting; Huang, Jikun; Peng, Shaobing; Xiong, Dongliang

doi:10.1093/jxb/ery188

Cited by 121 publications

(127 citation statements)

References 92 publications

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“…Here, stomatal conductance measured as the sum of both surfaces approached zero at −1.42 MPa. Studies on corn (Cochard, ), rice (Wang et al, ), and tomato (Skelton, Brodribb, & Choat, ) reported similar patterns of stomatal closure during dehydration suggesting that crops are sensitive to a changing environment and limit water losses early during water stress.…”

Section: Discussionmentioning

confidence: 93%

“…Xylem vulnerability to cavitation has been widely studied and provides a predictive indication of plant tolerance and mortality during drought (Anderegg et al, 2015). However, some studies report declines in K leaf at water potentials insufficient to cause cavitation but before or concomitant with stomatal closure (Brodribb & Holbrook, 2006;Holloway-Phillips & Brodribb, 2011;Scoffoni et al, 2018; Torres-Ruiz, Diaz-Espejo, Perez-Martin, & Hernandez-Santana, 2015;Wang, Du, Huang, Peng, & Xiong, 2018). One possible explanation for this behaviour is xylem wall implosion (i.e., xylem collapse) under negative pressure (Cochard, Froux, Mayr, & Coutand, 2004).…”

mentioning

confidence: 99%

“…An alternative explanation for declines in K leaf prior to cavitation is that the outside-xylary conductance (K ox ) could decline under mild water deficit conditions (Scoffoni et al, 2017). This has then been discussed as a possible driver of stomatal closure that could delay further decline of xylem conductance (K x ) by cavitation (Flexas, Carriquí, & Nadal, 2018;Wang et al, 2018).…”

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confidence: 99%

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Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

Corso

Delzon

Lamarque

et al. 2020

Plant Cell & Environment

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Identifying the drivers of stomatal closure and leaf damage during stress in grasses is a critical prerequisite for understanding crop resilience. Here, we investigated whether changes in stomatal conductance (gs) during dehydration were associated with changes in leaf hydraulic conductance (Kleaf), xylem cavitation, xylem collapse, and leaf cell turgor in wheat (Triticum aestivum). During soil dehydration, the decline of gs was concomitant with declining Kleaf under mild water stress. This early decline of leaf hydraulic conductance was not driven by cavitation, as the first cavitation events in leaf and stem were detected well after Kleaf had declined. Xylem vessel deformation could only account for <5% of the observed decline in leaf hydraulic conductance during dehydration. Thus, we concluded that changes in the hydraulic conductance of tissues outside the xylem were responsible for the majority of Kleaf decline during leaf dehydration in wheat. However, the contribution of leaf resistance to whole plant resistance was less than other tissues (<35% of whole plant resistance), and this proportion remained constant as plants dehydrated, indicating that Kleaf decline during water stress was not a major driver of stomatal closure.

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Section: Discussionmentioning

confidence: 93%

mentioning

confidence: 99%

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confidence: 99%

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Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

Corso

Delzon

Lamarque

et al. 2020

Plant Cell & Environment

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“…The study performed by Wang et al . () reports simultaneously the dynamics of K leaf , g s and g m during a drought event, showing that K leaf is the main driver of g s and g m decline under water stress in rice. K leaf decline with water stress compromises water availability in leaves, thus contributing to the hydraulic‐driven decline in g s (Theroux‐Rancourt et al ., ) and possibly to reduced g m as well.…”

Section: Coupling Of Hydraulics and Photosynthesismentioning

confidence: 98%

Linking water relations and hydraulics with photosynthesis

2019

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Summary For land plants, water is the principal governor of growth. Photosynthetic performance is highly dependent on the stable and suitable water status of leaves, which is balanced by the water transport capacity, the water loss rate as well as the water capacitance of the plant. This review discusses the links between leaf water status and photosynthesis, specifically focussing on the coordination of CO2 and water transport within leaves, and the potential role of leaf capacitance and elasticity on CO2 and water transport.

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“…

\frac{\partial {normalA}_{normalN}}{\partial {normalC}_{normalc}}

was calculated as the slope of A N /C c response curves over a C c range of 50 to 100 μmol mol −1 (Tomás et al ):

\frac{{dg}_{s}}{g_{s}} = ({normalg}_{normals}^{normalref} - {normalg}_{normals}) / {normalg}_{normals}^{normalref}

\frac{{dg}_{m}}{g_{m}} = ({normalg}_{normalm}^{normalref} - {normalg}_{normalm}) / {normalg}_{normalm}^{normalref}

\frac{normaldj}{normalj} = ({normalj}_{normalm}^{normalref} - j) / {normalj}_{normalm}^{normalref}

where

{normalg}_{normals}^{normalref}

{normalg}_{normalm}^{normalref}

and

{normalj}_{normalm}^{normalref}

are the reference values of stomatal and mesophyll conductance and of electron transport rate, respectively. In the current study, the maximum g s , g m and J flu were generally reached under WW conditions, therefore the maximum value among the WW treatment was used as a reference (Flexas et al , Wang et al ).…”

Section: Methodsmentioning

confidence: 99%

Drought‐introduced variability of mesophyll conductance in Gossypium and its relationship with leaf anatomy

Han

Lei

Zhang

et al. 2018

Physiologia Plantarum

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Mesophyll conductance (gm) is one of the major determinants of photosynthetic rate, for which it has an impact on crop yield. However, the regulatory mechanisms behind the decline in gm of cotton (Gossypium. spp) by drought are unclear. An upland cotton (Gossypium hirsutum) genotype and a pima cotton (Gossypium barbadense) genotype were used to determine the gas exchange parameters, leaf anatomical structure as well as aquaporin and carbonic anhydrase gene expression under well‐watered and drought treatment conditions. In this study, the decrease of net photosynthetic rate (AN) under drought conditions was related to a decline in gm and in stomatal conductance (gs). gm and gs coordinate with each other to ensure optimum state of CO2 diffusion and achieve the balance of water and CO2 demand in the process of photosynthesis. Meanwhile, mesophyll limitations to photosynthesis are equally important to the stomatal limitations. Considering gm, its decline in cotton leaves under drought was mostly regulated by the chloroplast surface area exposed to leaf intercellular air spaces per leaf area (Sc/S) and might also be regulated by the expression of leaf CARBONIC ANHYDRASE (CA1). Meanwhile, cotton leaves can minimize the decrease in gm under drought by maintaining cell wall thickness (Tcw). Our results indicated that modification of chloroplasts might be a target trait in future attempts to improve cotton drought tolerance.

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Leaf hydraulic vulnerability triggers the decline in stomatal and mesophyll conductance during drought in rice

Abstract: Leaf hydraulic conductance plays a role in stomatal closure during soil drought, and reduction in CO2 diffusion is a strong driver of the photosynthetic decline during drought.

Cited by 121 publications

References 92 publications

Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

Neither xylem collapse, cavitation, or changing leaf conductance drive stomatal closure in wheat

Linking water relations and hydraulics with photosynthesis

Drought‐introduced variability of mesophyll conductance in Gossypium and its relationship with leaf anatomy

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