Extension of a Farquhar model for limitations of leaf photosynthesis induced by light environment, phenology and leaf age in grapevines (Vitis vinifera L. cvv. White Riesling and Zinfandel)

Functional Plant Biology : FPB
Hans R Schultz

Abstract

Measurements of gas exchange and stomatal conductance were made on potted and field-grown grapevines (Vitis vinifera L.) on leaves from different light environments (sun and shade) at different phenological stages during the season to parameterise the Farquhar model. The model parameters for Rubisco activity (Vcmax), maximum electron transport rate (Jmax), and triose-phosphate utilisation (TPU) were estimated on the basis of a large data set (n = 105) of CO2 assimilation (A) versus internal CO2 pressure (Ci) curves. Leaf age was described with the leaf plastochron index (LPI). Stomatal coupling to photosynthesis was modelled with the Ball-Woodrow-Berry empirical model of stomatal conductance. Mature shade leaves had 35-40% lower values of Vcmax, Jmax and TPU than sun leaves. The difference between leaf types decreased at the end of the season. The ratio Jmax / Vcmax and values of day respiration (Rd) and CO2 compensation point in the absence of mitochondrial respiration (Γ*) varied little during the season and were independent of LPI. Validation of the model with independent diurnal data sets of measurements of gas exchange and stomatal conductance at ambient CO2 concentrations for three days between June and October, covering ...Continue Reading

Citations

May 22, 2004·Physiologia Plantarum·Luke HendricksonWah Soon Chow
Aug 1, 2005·Functional Plant Biology : FPB·Qiong GaoYongmei Huang
May 30, 2008·Journal of Experimental Botany·G LebonC Clément
Aug 22, 2015·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Gwendal LatoucheZoran G Cerovic
Jul 1, 2020·Functional Plant Biology : FPB·Xinglin TangXinliang Liu

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