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

Functional Plant Biology : FPB
Zsolt ZsófiSándor Dulai

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 ...Continue Reading

References

Jul 10, 2002·Annals of Botany·M M ChavesC Pinheiro
Aug 3, 2004·Journal of Experimental Botany·Hamlyn G Jones
Apr 19, 2005·Journal of Plant Physiology·Daymi CamejoJuan José Alarcón
Apr 1, 1984·Plant Physiology·W J DowntonJ R Seemann
Sep 1, 1990·Photosynthesis Research·O van Kooten, J F Snel
Jan 1, 1987·The New Phytologist·W J S DowntonB R Loveys

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Citations

May 15, 2020·Journal of the Science of Food and Agriculture·Elena BrunoriFabio Mencarelli
Jun 1, 2011·Functional Plant Biology : FPB·Julie M TararaRussell P Smithyman

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