Abstract
The Douro Region located in Northeast Portugal, within the Douro river basin, is surrounded by craggy mountains that confer it characteristic Mediterranean like climate with important inter-annual variability, were grapevines are exposed to severe water stress during the summer period, which in some years strongly affects their vintage behaviour. In order to mitigate these effects a study was conducted in a commercial vineyard with cv Touriga Nacional growing under three water regimes: non-irrigated (NI) and two irrigation strategies (WR1-30% ETc and WR2-60% ETc), in three selected years (2005, 2007 and 2009) which according the classification proposed by Winkler and co-authors put this place in the zones V, III and IV, respectively. The results showed that non-irrigated grapevines experienced severe water stress and consequently lower photosynthetic rates, due to stomatal and mesophylic limitations. By contrast, moderate levels of irrigation had a positive impact on leaf gas exchange rates, and on yield and berry quality.
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Claims 4
Claim · model-written summary
Non-irrigated Touriga Nacional grapevines experienced severe water stress.
- Material
- Touriga Nacionale1
- Treatment
- non-irrigatede0
- Outcome
- water stresse0
- Direction
- severee0
- Setting
- The Douro Regione2
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-irrigated grapevines experienced severe water stress”
e1“cv Touriga Nacional growing under three water regimes”
e2“The Douro Region located in Northeast Portugal”
Claim · model-written summary
Non-irrigated grapevines had lower photosynthetic rates, attributed to stomatal and mesophyll limitations.
- Material
- Touriga Nacionale1
- Treatment
- non-irrigatede0
- Outcome
- photosynthetic ratese0
- Direction
- lowere0
- Qualifier
- stomatal and mesophylic limitationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“non-irrigated grapevines experienced severe water stress and consequently lower photosynthetic rates, due to stomatal and mesophylic limitations”
e1“cv Touriga Nacional”
Claim · model-written summary
Moderate irrigation improved leaf gas exchange rates in Touriga Nacional grapevines.
- Material
- Touriga Nacionale1
- Treatment
- moderate levels of irrigatione0
- Outcome
- leaf gas exchange ratese0
- Direction
- positive impacte0
- Comparator
- non-irrigated (NI)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate levels of irrigation had a positive impact on leaf gas exchange rates, and on yield and berry quality”
e1“cv Touriga Nacional”
e2“non-irrigated (NI) and two irrigation strategies”
t0“grapevine”
Claim · model-written summary
Moderate irrigation improved Touriga Nacional grapevine yield and berry quality.
- Material
- Touriga Nacionale1
- Treatment
- moderate levels of irrigatione0
- Outcome
- yield and berry qualitye0
- Direction
- positive impacte0
- Comparator
- non-irrigated (NI)e2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“moderate levels of irrigation had a positive impact on leaf gas exchange rates, and on yield and berry quality”
e1“cv Touriga Nacional”
e2“non-irrigated (NI) and two irrigation strategies”
t0“grapevine”
The same questions in other papers
irrigation · physiology: gas exchange · VitisResults differ
7 papers in the same direction as this paper · 3 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- negative
8 papers more in this group
See all 12 papers →irrigation · quality: general · VitisPositive and negative results
4 papers in the same direction as this paper · 15 in the opposite direction · 3 reporting no difference from an alternative
- negative
- no effect
- no effect
19 papers more in this group
See all 23 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.