What Grapevines Do when Everybody Is Sleeping?

New study shows results of night-time water losses for grapevines. By Sigfredo Fuentes

What Grapevines Do when Everybody Is Sleeping?

Abstract:

Night-time water uptake (Sn) mainly corresponds to stem and organ rehydration and transpiration, the latter through stomata and cuticle.

Nocturnal transpiration is uncoupled from photosynthesis, therefore it contributes to reduce water use efficiency (WUE).

Night-time grapevine physiology was measured on field-grown grapevines (cv. Shiraz) under partial root-zone drying (PRD) and deficit irrigation (Exp 1), on potted vines (cv. Tempranillo) (Exp. 2) and on potted vines (cv. Cabernet Sauvignon) on a progressive drought treatment in the glasshouse (Exp. 3). Sap flow probes using the compensated heat pulse method (cHP) were installed in vines (Exp. 1 and 3).

Night-time gas exchange measurements were performed for Exp. 3. Other vine water status monitoring methods used were: midday stem water potential (Ψs) for all experiments, and abscisic acid (ABA) concentration monitored from leaf sap for Exp. 3.

Results showed that Sn was parabolically correlated to Ψs measured on the previous day for all treatments and cultivars. Two distinct zones where vines exhibit different night-time behaviour within the Ψs vs Sn parabolic relationships were identified for all experiments.

The differences between the two identified areas were related to the water status conditions of the vines:  i) non-water stress conditions (0 < Ψs < -1.0 MPa); ii) water stress conditions (-1.0 MPa < Ψs < -2.0 MPa).

Furthermore, levels of water stress were negatively correlated to concentrations of leaf sap ABA, which helped to explain the parabolic curve found for cv. Cabernet Sauvignon.

Link to full article, click NighttimeVines


Angel

Angel is a wine enthusiast and the owner of VineyardoftheFuture.com. With a keen interest in sustainable viticulture and the future of vineyard management, he shares his expertise and insights to inspire eco-conscious winegrowers. Angel is passionate about exploring the innovative use of technology, sustainable practices, and emerging trends that shape the vineyards of tomorrow.

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