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Reference: An increase in xylem embolism resistance of grapevine leaves during the growing season is coordinated with stomatal regulation, turgor loss point, and intervessel pit membranes
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Although xylem embolism resistance is traditionally considered as static, we hypothesized that in grapevine (Vitis vinifera) leaf xylem becomes more embolism resistant along the growing season.
We evaluated xylem architecture, turgor loss point (ΨTLP), and water potentials leading to 25% of maximal stomatal conductance (gs25) or 50% embolism in the leaf xylem (P50) in three irrigation treatments and at three time points during the growing season, while separating the effects of leaf age and time of season.
Hydraulic traits acclimated over the growing season in a coordinated manner. Without irrigation, ΨTLP, gs25, and P50 decreased between late May and late August by 0.95, 0.77, and 0.71 MPa, respectively. A seasonal shift in P50 occurred even in mature leaves, while irrigation had only a mild effect (<0.2 MPa) on P50. Vessel size and pit membrane thickness were also seasonally dynamic, providing a plausible explanation for the shift in P50.
Our findings provide clear evidence that grapevines can modify their hydraulic traits along a growing season to allow lower xylem water potential, without compromising gas exchange, leaf turgor, or xylem integrity. Seasonal changes should be considered when modeling ecosystem vulnerability to drought or comparing data sets acquired at different phenological stages.

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Publication Details

Published: 2020
Publication: New Phytologist
Issue: 2020 Online October 2020
Author: Sorek Y 2020

Brain food

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