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Stomatal and mesophyll conductance are dominant limitations to photosynthesis in response to heat stress during severe drought in a temperate and a tropical tree species

Zhu, Lingling; Li, Hongcheng; Thorpe, Michael; Hocart, Charles; Song, Xin

Description

Key message: Stomatal and mesophyll conductance were the dominant limitations to photosynthesis in response to heat stress during severe drought in both a temperate and a tropical tree species. Abstract: Drought and heat stress cause a significant reduction in forest primary production. The current study aims to determine the major limitations to photosynthesis in a temperate and tropical tree species experiencing a combination of drought and heat stress; an increasingly common situation in the...[Show more]

dc.contributor.authorZhu, Lingling
dc.contributor.authorLi, Hongcheng
dc.contributor.authorThorpe, Michael
dc.contributor.authorHocart, Charles
dc.contributor.authorSong, Xin
dc.date.accessioned2022-11-01T23:28:45Z
dc.identifier.issn0931-1890
dc.identifier.urihttp://hdl.handle.net/1885/277923
dc.description.abstractKey message: Stomatal and mesophyll conductance were the dominant limitations to photosynthesis in response to heat stress during severe drought in both a temperate and a tropical tree species. Abstract: Drought and heat stress cause a significant reduction in forest primary production. The current study aims to determine the major limitations to photosynthesis in a temperate and tropical tree species experiencing a combination of drought and heat stress; an increasingly common situation in the face of climate change. Two tree species, one temperate (Fraxinus chinensis) and the other tropical (Radermachera sinica) were subjected in growth chambers to a 2-day heat stress of 40 °C during ca. 2-week period of drought, followed by re-watering. The limitations by three factors that affect photosynthesis (stomatal and mesophyll conductance, and biochemical processes) were partitioned based on measurements of gas exchange, net assimilation rate—intercellular CO concentration (A —C ) curves and chlorophyll fluorescence. Under the drought-only condition, photosynthesis was primarily limited by stomatal conductance in both species. Unexpectedly, heat stress did not further reduce photosynthesis during drought in either tree species. In both species, carbon assimilation during drought and added heat stress was primarily limited by stomatal and mesophyll conductance. Drought decreased mesophyll conductance in both species but the effects were more pronounced in the tropical tree species, R. sinica. Biochemical limitation remained low throughout the stress period. These results suggest the importance of balancing water conservation and transpirational cooling in the diffusive pathway in response to, not only drought, but also the combination of water and heat stress in forest trees. 2 net i
dc.description.sponsorshipThe research was supported by Shenzhen Municipal Peacock Team Program (KQTD2017032715165926) from Science and Technology Innovation Commission of the Shenzhen City and a general program from the National Natural Science Foundation of China (31770435) to X.S., and the China Postdoctoral Science Foundation (2019M652760) to L.Z.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherSpringer
dc.rights© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021
dc.sourceTrees (Structure and Function)
dc.subjectHigh temperature
dc.subjectWater defcit
dc.subjectWater use effciency
dc.subjectCarbon exchange
dc.subjectVcmax
dc.titleStomatal and mesophyll conductance are dominant limitations to photosynthesis in response to heat stress during severe drought in a temperate and a tropical tree species
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume35
dc.date.issued2021
local.identifier.absfor310806 - Plant physiology
local.identifier.ariespublicationa383154xPUB19558
local.publisher.urlhttps://link.springer.com/
local.type.statusPublished Version
local.contributor.affiliationZhu, Lingling, Shenzhen University
local.contributor.affiliationLi, Hongcheng, Shenzhen University
local.contributor.affiliationThorpe, Michael, College of Science, ANU
local.contributor.affiliationHocart, Charles, College of Science, ANU
local.contributor.affiliationSong, Xin, Shenzhen University
local.description.embargo2099-12-31
local.bibliographicCitation.startpage1613
local.bibliographicCitation.lastpage1626
local.identifier.doi10.1007/s00468-021-02140-9
local.identifier.absseo280112 - Expanding knowledge in the health sciences
dc.date.updated2021-11-28T07:26:02Z
local.identifier.scopusID2-s2.0-85106236326
CollectionsANU Research Publications

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