Temperature acclimation of net photosynthesis and its underlying component processes in four tropical tree species

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Wittemann, MariaGothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences (författare)

Temperature acclimation of net photosynthesis and its underlying component processes in four tropical tree species

Artikel/kapitelEngelska2022

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2022-01-17
Oxford University Press (OUP),2022

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LIBRIS-ID:oai:gup.ub.gu.se/315252
https://gup.ub.gu.se/publication/315252URI
https://doi.org/10.1093/treephys/tpac002DOI

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Språk:engelska

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Ämneskategori:art swepub-publicationtype

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The effect of temperature change on leaf physiology has been extensively studied in temperate trees and to some extent in boreal and tropical tree species. While increased temperature typically stimulates leaf CO2 assimilation and tree growth in high-altitude ecosystems, tropical species are often negatively affected. These trees may operate close to their temperature optima and have a limited thermal acclimation capacity due to low seasonal and historical variation in temperature. To test this hypothesis, we studied the extent to which the temperature sensitivities of leaf photosynthesis and respiration acclimate to growth temperature in four common African tropical tree species. Tree seedlings native to different altitudes and therefore adapted to different growth temperatures were cultivated at three different temperatures in climate-controlled chambers. We estimated the acclimation capacity of the temperature sensitivities of light-saturated net photosynthesis, the maximum rates of Rubisco carboxylation (V-cmax) and thylakoid electron transport (J), and dark respiration. Leaf thylakoid membrane lipid composition, nitrogen content and leaf mass per area were also analyzed. Our results showed that photosynthesis in tropical tree species acclimated to higher growth temperatures, but that this was weakest in the species originating from the coolest climate. The temperature optimum of J acclimated significantly in three species and variation in J was linked to changes in the thylakoid membrane lipid composition. For V-cmax, there was only evidence of significant acclimation of optimal temperature in the lowest elevation species. Respiration acclimated to maintain homeostasis at growth temperature in all four species. Our results suggest that the lowest elevation species is better physiologically adapted to acclimate to high growth temperatures than the highest elevation species, indicating a potential shift in competitive balance and tree community composition to the disadvantage of montane tree species in a warmer world.

Ämnesord och genrebeteckningar

NATURVETENSKAP Biologi hsv//swe
NATURAL SCIENCES Biological Sciences hsv//eng
climate change
Jmax
Vcmax
warming
thermal-acclimation
growth temperature
leaf respiration
elevated-temperatures
thylakoid membranes
biochemical-model
lipid-composition
polar lipids
plant
responses
Forestry

Biuppslag (personer, institutioner, konferenser, titlar ...)

Andersson, Mats X.,1977Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xamatb (författare)
Ntirugulirwa, BonaventureGothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xntibo (författare)
Tarvainen, Lasse,1977Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xtarla (författare)
Wallin, Göran,1955Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xwallg (författare)
Uddling, Johan,1972Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences(Swepub:gu)xuddjo (författare)
Göteborgs universitetInstitutionen för biologi och miljövetenskap (creator_code:org_t)

Sammanhörande titlar

Ingår i:Tree Physiology: Oxford University Press (OUP)42:6, s. 1188-12020829-318X1758-4469

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Av författaren/redakt...: Wittemann, Maria; Andersson, Mats ...; Ntirugulirwa, Bo ...; Tarvainen, Lasse ...; Wallin, Göran, 1 ...; Uddling, Johan, ...

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NATURVETENSKAP: NATURVETENSKAP; och Biologi

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Av lärosätet: Göteborgs universitet

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