Limitations to leaf photosynthesis in field-grown grapevine under drought - metabolic and modelling approaches

Functional Plant Biology : FPB
J P MarocoM Manuela Chaves

Abstract

The effects of a slowly-imposed drought stress on gas-exchange, chlorophyll a fluorescence, biochemical and physiological parameters of Vitis vinifera L. leaves (cv. Aragonez, syn. Tempranillo) growing in a commercial vineyard (South Portugal) were evaluated. Relative to well-watered plants (predawn water potential, ΨPD = -0.13 ± 0.01 MPa), drought-stressed plants (ΨPD = -0.97 ± 0.01 MPa) had lower photosynthetic rates (ca 70%), stomatal conductance, and PSII activity (associated with a higher reduction of the quinone A pool and lower efficiency of PSII open centres). Stomatal limitation to photosynthesis was increased in drought-stressed plants relative to well-watered plants by ca 44%. Modelled responses of net photosynthesis to internal CO2 indicated that drought-stressed plants had significant reductions in maximum Rubisco carboxylation activity (ca 32%), ribulose-1,5-bisphosphate regeneration (ca 27%), and triose phosphate (triose-P) utilization rates (ca 37%) relative to well-watered plants. There was good agreement between the effects of drought on modelled biochemical parameters, and in vitro activities of key enzymes of carbon metabolism, namely Rubisco, glyceraldehyde-3-phosphate dehydrogenase, ribulose-5-phosphate ki...Continue Reading

Citations

May 30, 2008·Journal of Experimental Botany·G LebonC Clément
Feb 26, 2019·Planta·A SongyF Fontaine
Dec 22, 2010·Journal of Experimental Botany·C Pinheiro, M M Chaves
Jun 1, 2016·Frontiers in Plant Science·Stefania ToscanoDaniela Romano
Jun 12, 2013·Photosynthesis Research·Jeroni GalmésJaume Flexas
Aug 1, 2004·Functional Plant Biology : FPB·Josefina BotaHipólito Medrano
Oct 1, 2004·Functional Plant Biology : FPB·Luke HendricksonRobert T Furbank
Aug 10, 2018·The Plant Journal : for Cell and Molecular Biology·Jaume Flexas, Jorge Gago
Apr 1, 2012·Functional Plant Biology : FPB·Joaquim M CostaMaria M Chaves
Jul 19, 2013·Photosynthesis Research·Marek ZivcakSuleyman I Allakhverdiev
Sep 2, 2021·The Plant Journal : for Cell and Molecular Biology·Dongqian ShanJin Kong

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