Articles
Water potential, fluorescence, and photosynthetic parameters in Vitis vinifera ‘Alvarinho’ under different irrigation treatments
Article number
1409_61
Pages
483 – 492
Language
English
Abstract
In temperate climates, water deficit conditions are necessary to produce high-quality wine.
However, excessive water deficit stress can lead to significant productivity and quality losses.
Plant physiological responses to drought stress can be monitored through leaf water potential, photosynthesis, stomatal behaviour, and other parameters like fluorescence signals and indices obtained using a portable sensor (Multiplex®). This study aimed to evaluate stem water potential and leaf gas exchange parameters under increasing drought in field conditions and assess the feasibility of using chlorophyll fluorescence parameters to determine water status in vineyards.
The research was conducted during grape maturation in 2022, under three irrigation treatments: full irrigation, deficit irrigation, and rainfed.
Stem water potential (ψstem), stomatal conductance (gsw), net photosynthesis (AN), transpiration (E), leaf water use efficiency (WUEL), and Multiplex fluorescence signals were measured in the morning, midday, and afternoon to understand canopy physiology and its diurnal dynamics.
Both deficit irrigation and rainfed conditions improved WUEL by reducing water usage, though validation with production quality data and rootstock effects on ‘Alvarinho’ drought tolerance is needed.
The near-anysohydric nature of ‘Alvarinho’ supports moderate water deficits, but careful management is essential to avoid affecting photosynthesis.
UV-induced chlorophyll fluorescence is a valuable, non-invasive tool for monitoring plant water status under stress.
However, excessive water deficit stress can lead to significant productivity and quality losses.
Plant physiological responses to drought stress can be monitored through leaf water potential, photosynthesis, stomatal behaviour, and other parameters like fluorescence signals and indices obtained using a portable sensor (Multiplex®). This study aimed to evaluate stem water potential and leaf gas exchange parameters under increasing drought in field conditions and assess the feasibility of using chlorophyll fluorescence parameters to determine water status in vineyards.
The research was conducted during grape maturation in 2022, under three irrigation treatments: full irrigation, deficit irrigation, and rainfed.
Stem water potential (ψstem), stomatal conductance (gsw), net photosynthesis (AN), transpiration (E), leaf water use efficiency (WUEL), and Multiplex fluorescence signals were measured in the morning, midday, and afternoon to understand canopy physiology and its diurnal dynamics.
Both deficit irrigation and rainfed conditions improved WUEL by reducing water usage, though validation with production quality data and rootstock effects on ‘Alvarinho’ drought tolerance is needed.
The near-anysohydric nature of ‘Alvarinho’ supports moderate water deficits, but careful management is essential to avoid affecting photosynthesis.
UV-induced chlorophyll fluorescence is a valuable, non-invasive tool for monitoring plant water status under stress.
Authors
S. Mendes, F. Portela, S. Silva, C. Araújo-Paredes, I. Valin
Keywords
anisohydric, isohydric, leaf net assimilation, leaf water use efficiency, Multiplex®, stem water potential, stomatal conductance, transpiration
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