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You are here: Home > Journals > FP > FP08200
RESEARCH ARTICLE
Contents Vol 36(4)

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

Zsolt Zsófi A E , Gyula Váradi B , Borbála Bálo A , Marianna Marschall C , Zoltán Nagy D and Sándor Dulai C
+ Author Affiliations
- Author Affiliations

A Research Institute of Károly Róbert College for Viticulture and Enology, Eger 3301-Eger Kőlyuktető PO Box 83, Hungary.

B Research Institute of Corvinus University for Viticulture and Enology, 6000-Kecskemét Úrihegy 5/A, Hungary.

C Eszterházy Károly College, Eger, Department of Plant Physiology, 3300-Eger Leányka Street 6, Hungary.

D Szent István University, Department of Botany and Plant Physiology, 2100-Gödöllő Páter Károly Street 1, Hungary.

E Corresponding author. Email: zszs@szbki-eger.hu

Functional Plant Biology 36(4) 310-322 https://doi.org/10.1071/FP08200
Submitted: 17 July 2008  Accepted: 29 January 2009   Published: 1 April 2009

Abstract

Heat sensitivity of grapevine (Vitis vinifera L. cv. Kékfrankos) photosynthesis was studied in two vineyards (Eger-Kőlyuktető, 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′ 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.

Additional keywords: climate, grapevine, heat sensitivity, photosynthesis, water deficit.


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