Journal
WATER
Volume 13, Issue 17, Pages -Publisher
MDPI
DOI: 10.3390/w13172336
Keywords
drought; Vitis vinifera; NSC; Merlot; dry matter allocation
Categories
Funding
- European Regional Development Fund
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Research on drought-affected grapevines showed that plants adjust their carbon allocation strategy during stress periods, favoring more biomass allocation to roots to protect NSC reserves. Additionally, the higher NSC content in leaf petioles of stressed vines may serve as part of osmotic adjustments.
Studying changes in partitioning of dry matter and nonstructural carbohydrates (NSC) content in both aboveground and underground perennial tissues in drought-affected grapevines could provide insights into plant response and carbon allocation strategies during stress periods. The analysis of soluble NSC and starch content in leaf petioles, due to their role in hydraulic segmentation, should also be considered. In the present research, these aspects have been investigated in Merlot grapevines grown in pots and subjected to progressive and increasing soil dehydration, and in well-irrigated vines. Drought conditions caused drastic reduction of shoot elongation and total plant leaf area development in favor of a greater biomass allocation and partitioning towards roots, where most of the NSC reserves were also conserved. Dry matter content of the perennial organs increased in stressed vines due to growth reduction, allocation of carbon reserves and possible anatomical modifications. Vines subjected to drought showed a higher NSC content in petioles, supporting the hypothesis that they are involved as compatible solutes in osmotic adjustments.
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