Irrigated Shiraz vines (Vitis vinifera) upregulate gas exchange and maintain berry growth in response to short spells of high maximum temperature in the field

Functional Plant Biology : FPB
Chris J SoarVictor O Sadras

Abstract

We tested the hypotheses that (i) a short period of high maximum temperature disrupts gas exchange and arrests berry growth and sugar accumulation in irrigated Shiraz vines (Vitis vinifera L.), and (ii) the magnitude of these effects depend on the phenological window when stress occur. Using a system combining passive heating (greenhouse effect) and active cooling (fans) to control daytime temperature, we compared vines heated to a nominal maximum of 40°C for three consecutive days and untreated controls. Maximum air temperature in heated treatments was 7.3°C (2006-07) and 6.5°C (2007-08) above ambient. Heat episodes were aligned with the beginning of a weekly irrigation cycle and applied in one of four phenological windows, namely post-fruit set, pre-veraison, veraison and pre-harvest. Heating systems did not affect relative humidity, hence vapour pressure deficit (VPD) was increased in the heated treatments and tracked the daily cycle of temperature. Heat did not affect the dynamics of berry growth and sugar accumulation, except for a 16% reduction in berry size and sugar content in vines heated shortly after fruit set in 2006-07. Vines upregulated stomatal conductance and gas exchange in response to heat. Stomatal conductanc...Continue Reading

References

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Oct 13, 2005·The New Phytologist·Thomas N Buckley
Aug 8, 2008·Plant, Cell & Environment·Tim J Brodribb, Gregory J Jordan
Aug 21, 2008·Journal of Integrative Plant Biology·Hong-Tao LiuWei-Dong Huang
Dec 1, 2006·Functional Plant Biology : FPB·John B Passioura

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Citations

Oct 17, 2019·Functional Plant Biology : FPB·Alexander D LevinMark A Matthews
Nov 6, 2018·Journal of Experimental Botany·Julia C GouotCelia Barril
Dec 11, 2020·Journal of Experimental Botany·Megan K Bartlett, Gabriela Sinclair
Dec 17, 2020·Plants·Xenophon VeniosGeorgios Banilas
May 18, 2021·Journal of the Science of Food and Agriculture·Mariona Martínez-SubiràIgnacio Romagosa

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