Heat acclimation of grapevine leaf photosynthesis: Mezo- and macroclimatic aspects

Zsolt Zsófi, Gyula Váradi, Borbála Bálo, Marianna Marschall, Zoltán Nagy, Sándor Dulai

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21 Citations (Scopus)

Abstract

Heat sensitivity of grapevine (Vitis vinifera L. cv. Kékfrankos) photosynthesis was studied in two vineyards (Eger-Kolyukteto, flat; and Eger-Nagyeged hill, steep slope) with different mesoclimates and water supply conditions in two climatically different years. 2007 was drier and warmer, with higher vapour pressure deficit (VPD) than 2005. Pre-dawn water potential measurements indicated mild water deficit at the steep-sloped vineyard. In July 2005 mild water deficit enhanced the thermostability of grapevine photosynthesis, as reflected in the temperature dependence of optimal quantum yield (Fv/Fm) and in the critical temperature of initial fluorescence (F0Tc). Decreased Fv/Fm and actual quantum yield (ΔF/Fm′) was recorded at most temperatures in September at the water-stressed (steep slope) site. This time, F0Tcs were also lower due to early leaf senescence. In September 2007, heat sensitivity of Fv/Fm was similar to 2005, and ΔF/Fm 0 indicated higher thermostability at both sites, but keeping the consistent difference between the two vineyards. The critical points of steady-state fluorescence (FsTc) were higher by 3-6°C at both vineyards in 2007 than in 2005. Although, in September thermolabile F0 signals were measured at the water-stressed vineyard, the heat sensitivity was not decreased in light adapted state, assumingly as a result of enhanced xanthophyll cycle pigment pool size. The higher xanthophyll pigments pool size (V +A+ Z) in 2007 (compared to 2005) at the unstressed (flat) vineyard suggests that high temperature and VPD play a role in changing (V +A+ Z)/(chl a + b), and, thus, results in higher thermostability under high light conditions.

Original languageEnglish
Pages (from-to)310-322
Number of pages13
JournalFunctional Plant Biology
Volume36
Issue number4
DOIs
Publication statusPublished - Jan 1 2009

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Keywords

  • Climate
  • Grapevine
  • Heat sensitivity
  • Photosynthesis
  • Water deficit

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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