42 research outputs found
Influence of soil water content and atmospheric conditions on leaf water potential in cv. "Touriga Nacional" deep-rooted vineyards
Abstract In this study, the influence of soil and atmosphere
conditions on noon and basal leaf water potential of
vines ‘‘Touriga Nacional’’ in the Da˜o region submitted to
different irrigation treatments is analysed. Both indicators
showed to be dependent on environmental conditions at the
time of measurement. Leaf water potential at noon of fully
watered plants was linearly related with atmospheric conditions,
with values registered when vapour pressure deficit
(VPD) was higher than approximately 3 kPa being no
different from the values registered in stressed plants.
Therefore, this indicator cannot be reliably used to distinguish
different plant water stress levels when atmospheric
conditions induce high evaporative demands. The basal
leaf water potential (wb) was also influenced by VPD at the
time of measurement for all soil water conditions. In well
irrigated plants, it was even possible to establish a baseline
that can therefore be used to identify nonwater stressed
conditions (wb (MPa) = -0.062–0.0972 VPD (kPa),
r2 = 0.78). A good correlation was found between soil
humidity and wb. However, more than the average value of
the whole thickness of soil monitored, the wb values were dependent on the distribution of soil humidity, with the
plants responding to the presence of wet layers
Relações hídricas, rendimento e compostos fenólicos de uvas Cabernet Sauvignon em três tipos de solo
Water relations of field-grown grapevines in the São Francisco Valley, Brazil, under different rootstocks and irrigation strategies
Physiological responses and production of 'Syrah' vines as a function of training systems
Plant architecture and its interaction with agricultural practices and environmental constraints is determinant for grapevine canopy structure, which is related to carbon assimilation, bud fertility and fruit quality. In this context, this study evaluated the performance of field-grown 'Syrah' grapevines conducted by two management systems: Vertical Shoot Position (VSP) or a modified Geneva Double Curtain (GDC), in Pirapora, state of Minas Gerais, Brazil, during the winters of 2007 and 2008. The evaluations of leaf area, water relations and net CO2 assimilation were made at the end of the ripening period. Yield per vine and per hectare were estimated and mean berry weight and diameter, total soluble solids, pH and titratable acidity were evaluated during berry ripening. The grapevines trained in VSP had higher water status as compared to GDC, shown by differences in pre-dawn leaf water potential (ψpd) and stem water potential (ψstem). However, the CO2 assimilation was similar in both training systems. Fruit exposure was higher in VSP than in GDC, which contributed to increasing berry temperature. At harvest, the berries in GDC reached values near to 23 ºBrix whereas berries in VSP showed values near 21 ºBrix
Physiological and agronomical responses of Syrah grapevine under protected cultivation
Five omic technologies are concordant in differentiating the biochemical characteristics of the berries of five grapevine (Vitis vinifera L.) cultivars
Stem water potential is a sensitive indicator of grapevine water status
International audienc
The assessment of vine water and nitrogen uptake by means of physiological indicators influence on vine development and berry potential (Vitis vinifera L. cv Merlot, 2000, Bordeaux)
International audienc
The use of physiological indicators to assess wine water uptake and to manage vineyard irrigation
International audienc
L'intérêt du dosage de l'azote total et de l'azote assimilable dans le moût comme indicateur de la nutrition azotée de la vigne
National audienc