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- W1834808812 abstract "Field measurements of photosynthesis of Vitis vinifera cv. Semillon leaves in relation to a hot climate, and responses to photon flux densities (PFDs) and internal CO2 concentrations (ci) at leaf temperatures from 20 to 40 °C were undertaken. Average rates of photosynthesis measured in situ decreased with increasing temperature and were 60% inhibited at 45 °C compared with 25 °C. This reduction in photosynthesis was attributed to 15–30% stomatal closure. Light response curves at different temperatures revealed light-saturated photosynthesis optimal at 30 °C but also PFDs saturating photosynthesis increased from 550 to 1200 µmol (photons) m−2 s−1 as temperatures increased. Photosynthesis under saturating CO2 concentrations was optimal at 36 °C while maximum rates of ribulose 1,5-bisphosphate (RuBP) carboxylation (Vcmax) and potential maximum electron transport rates (Jmax) were also optimal at 39 and 36 °C, respectively. Furthermore, the high temperature-induced reduction in photosynthesis at ambient CO2 was largely eliminated. The chloroplast CO2 concentration at the transition from RuBP regeneration to RuBP carboxylation-limited assimilation increased steeply with an increase in leaf temperature. Semillon assimilation in situ was limited by RuBP regeneration below 30 °C and above limited by RuBP carboxylation, suggesting high temperatures are detrimental to carbon fixation in this species." @default.
- W1834808812 created "2016-06-24" @default.
- W1834808812 creator A5006636011 @default.
- W1834808812 creator A5037540437 @default.
- W1834808812 date "2011-12-30" @default.
- W1834808812 modified "2023-10-01" @default.
- W1834808812 title "Modelling photosynthetic responses to temperature of grapevine (Vitis vinifera cv. Semillon) leaves on vines grown in a hot climate" @default.
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- W1834808812 doi "https://doi.org/10.1111/j.1365-3040.2011.02471.x" @default.
- W1834808812 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22150771" @default.
- W1834808812 hasPublicationYear "2011" @default.
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