Effects of drought on light-energy dissipation mechanisms in high-light-acclimated, field-grown grapevines

Functional Plant Biology : FPB
Hipólito MedranoJaume Flexas

Abstract

The response of several light-energy dissipation mechanisms to water shortage was analysed in a 10-year study in field-grown, high-light-acclimated grapevines, and compared with those of greenhouse-grown, low-light-acclimated grapevines. Dissipation mechanisms, except leaf photochemistry, differ among cultivars and acclimate to the prevailing light conditions during growth. However, no additional acclimation to drought was observed. The dependence of the dissipation responses on stomatal conductance suggests that low CO2 availability in the chloroplasts during drought triggers variations in the energy dissipation pattern. In irrigated grapevines under high light, more than 50% of total absorbed energy is thermally dissipated. There is evidence that implicates the xanthophyll cycle as the main thermal dissipation processes. CO2 assimilation is the most important photochemical pathway of dissipation in irrigated plants, but is replaced by photorespiration when CO2 assimilation declines under mild drought. Under moderate to severe drought, both photosynthesis and photorespiration decline, and thermal dissipation increases to account for up to 90% of total dissipation. Involvement of other processes in light dissipation is minimal ...Continue Reading

Citations

Nov 13, 2007·Plant, Cell & Environment·Jaume FlexasHipólito Medrano
Aug 31, 2007·Plant, Cell & Environment·Jaume FlexasMiquel Ribas-Carbo
Jul 20, 2007·The New Phytologist·J FlexasH Medrano
Aug 1, 2004·Functional Plant Biology : FPB·Josefina BotaHipólito Medrano
Apr 1, 2005·Functional Plant Biology : FPB·Karen Peña-RojasIsabel Fleck
Jun 15, 2006·Plant Biology·H RennenbergA Gessler
May 22, 2004·Physiologia Plantarum·Luke HendricksonWah Soon Chow
Jul 10, 2007·Plant, Cell & Environment·Antonio Diaz-EspejoJosé Enrique Fernández

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