Abstract
Responses of grapevine vegetative growth components to mild, medium and severe soil water deficits were used to identify simple and sensitive indicators for early diagnosis of water stress. Soil water deficit was characterised as the fraction of transpirable soil water (FTSW) remaining in a water-depleted rootzone. Growth components included the number of emerged leaves on first (Ist) and second (IInd) order lateral branches, the leaf area and internode length of each phytomer of Ist order lateral branches, and the frequency of IInd order lateral branching. These components were measured in a greenhouse on Shiraz (syn. Syrah) grapevines, over a 38-day period of stabilised soil water regimes. Leaf emergence rate, final leaf area and final internode length of lateral branches I were relatively insensitive to mild and medium water deficits. They only decreased in response to severe water deficits. The frequency of IInd order lateral branching showed a similar trend, but was inhibited at severe water deficits. The leaf emergence rate of lateral branches II was highly sensitive to FTSW, and decreased even in response to mild water deficits. Because measurement of leaf emergence rate is a time consuming process, further analysis of the data was undertaken to identify a simpler but similarly effective indicator of cumulative water deficit. Accordingly, we established that the final length of lateral branches I was sensitive to medium water deficits, while the final ratio of the number of leaves on lateral branches II to the number of leaves on lateral branches I, was sensitive to even mild water deficits. Both of these composite indicators (derived variables) were relatively easy to measure and showed potential as early indicators of water deficits. They were more sensitive to FTSW than was predawn leaf water potential. Moreover, the final ratio of the number of leaves on lateral branches II to the number of leaves on lateral branches I was even more sensitive to FTSW than was stomatal conductance.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 8
Claim · model-written summary
Leaf emergence rate, final leaf area, and final internode length of first-order lateral branches declined only under severe water deficits.
- Treatment
- severe water deficitse0
- Outcome
- Leaf emergence rate, final leaf area and final internode length of lateral branches Ie0
- Direction
- decreasede0
- Comparator
- mild and medium water deficitse0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“Leaf emergence rate, final leaf area and final internode length of lateral branches I were relatively insensitive to mild and medium water deficits. They only decreased in response to severe water deficits.”
Claim · model-written summary
Second-order lateral branching frequency was inhibited by severe water deficits.
- Treatment
- severe water deficitse0
- Outcome
- frequency of IInd order lateral branchinge0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“The frequency of IInd order lateral branching showed a similar trend, but was inhibited at severe water deficits.”
Claim · model-written summary
Leaf emergence rate of second-order lateral branches decreased even under mild water deficits.
- Treatment
- mild water deficitse0
- Outcome
- leaf emergence rate of lateral branches IIe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“The leaf emergence rate of lateral branches II was highly sensitive to FTSW, and decreased even in response to mild water deficits.”
Claim · model-written summary
Final length of first-order lateral branches was sensitive to medium water deficits.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“the final length of lateral branches I was sensitive to medium water deficits”
Claim · model-written summary
The final second-to-first-order lateral branch leaf-number ratio was sensitive even to mild water deficits.
- Treatment
- mild water deficitse0
- Outcome
- final ratio of the number of leaves on lateral branches II to the number of leaves on lateral branches Ie0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“the final ratio of the number of leaves on lateral branches II to the number of leaves on lateral branches I, was sensitive to even mild water deficits”
Claim · model-written summary
Both composite growth indicators were relatively easy to measure and showed potential as early water-deficit indicators.
- Outcome
- early indicators of water deficitse0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Schema note from the model: Method claim lacks a quantitative value or comparator.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“Both of these composite indicators (derived variables) were relatively easy to measure and showed potential as early indicators of water deficits.”
Claim · model-written summary
The two composite indicators were more sensitive to FTSW than predawn leaf water potential.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“They were more sensitive to FTSW than was predawn leaf water potential.”
Claim · model-written summary
The final second-to-first-order lateral branch leaf-number ratio was more sensitive to FTSW than stomatal conductance.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“grapevine (Vitis vinifera L.)”
e0“the final ratio of the number of leaves on lateral branches II to the number of leaves on lateral branches I was even more sensitive to FTSW than was stomatal conductance.”
The same questions in other papers
drought · growth · VitisResults differ
25 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- negative
- negative
28 papers more in this group
See all 32 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.