Assessing Grapevine Water Status by Integrating Vine Transpiration, Leaf Gas Exchanges, Chlorophyll Fluorescence and Sap Flow Measurements
نویسندگان
چکیده
A precise knowledge of the grapevine responses to increasing level water stress is utmost relevance for an effective application deficit irrigation strategies in viticulture. Against this background, a study was conducted on potted grapevines subjected two ten-day drought cycles assess their status by integrating information derived from different physiological indexes including whole-plant transpiration (measured gravimetrically and with sap flow sensors), leaf gas exchanges chlorophyll fluorescence. When soil availability not limited, vine rate determined mainly environmental factors ranged between 0.5 2 L day−1 m−2 surface. Transpiration affected only when became evident (midday stem potential < −1 MPa), vines showing strong limitation stomata functioning (stomatal conductance 0.05 mol s−1) and, consequently, low rates (<0.5 d−1). measured sensors were correlated those gravimetrically, daily patterns that highly intensity stress. Nevertheless, these underestimated actual rates, limiting reliability vineyard management. At end second cycle, showed very limited changes conditions (same photosynthetic stomatal at morning, midday afternoon), likely reflecting carryover effect first cycle incomplete recovery before beginning second. Evidence severe reached also given high value quantum yield nonregulated energy dissipation (Y(NO) higher than 0.4) found cycle. Taken together, obtained results integrate current development grapevine, highlighting specific could be used effectively correct management
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ژورنال
عنوان ژورنال: Agronomy
سال: 2023
ISSN: ['2156-3276', '0065-4663']
DOI: https://doi.org/10.3390/agronomy13020464