Abstract
The responses of growth, components of leaf water potential, and mechanical properties of leaves to ontogeny and soil water deficits were investigated in wine grape Vitis vinifera L. Vines were cultured in soil in controlled environments, and water deficits were imposed by withholding water. Osmotic adjustment of several hundred kilo‐pascals maintained turgor at or above that of controls, but growth was completely inhibited. The bulk modulus of elasticity increased almost twofold, from 8.1 MPa for a rapidly expanding leaf to 14.7 MPa for a similar leaf in which growth had ceased after withholding water for several days, and continued to increase to 20.3 MPa 2 d after growth had ceased. Stress‐strain relationships of isolated leaf strips were determined with the Instron analyzer. Total extension (elastic and plastic components) under 20‐ or 30‐g loads was linearly related to the rate of leaf expansion determined prior to sampling. Total extension of well‐watered leaves exhibited a diurnal pattern, with a minimum extensibility near midnight and high extensibility in the light. Plastic extensibility was estimated as the difference in extension in successive load cycles. Plastic extension was linearly related to the rate of leaf expansion. The results indicate that the extensibility (as determined by Instron analysis) of grape leaf tissue decreases concomitant with the rate of expansion as leaves age. Similarly, plastic and elastic extensibility decrease when growing leaves are exposed to water deficits. The results are consistent with the hypothesis that decreased cell‐wall extensibility contributes to the inhibition of leaf expansion caused by water deficits.
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Claims 8
Claim · model-written summary
Osmotic adjustment under water deficit kept turgor at or above that of controls.
- Taxon
- Vitis vinifera
Vitis viniferae0 - Treatment
- water deficitse1
- Outcome
- turgore2
- Direction
- at or abovee2
- Comparator
- controlse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e1“water deficits were imposed by withholding water”
e2“Osmotic adjustment of several hundred kilo‐pascals maintained turgor at or above that of controls, but growth was completely inhibited”
Claim · model-written summary
Osmotic adjustment reached several hundred kilo-pascals in water-deficit grape leaves.
- Taxon
- Vitis viniferaVitis viniferae0
- Outcome
- Osmotic adjustmente2
- Value
- several hundred kilo‐pascalse2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e2“Osmotic adjustment of several hundred kilo‐pascals maintained turgor at or above that of controls, but growth was completely inhibited”
Claim · model-written summary
Growth of water-deficit grape leaves was completely inhibited.
- Taxon
- Vitis viniferaVitis viniferae0
- Treatment
- water deficitse1
- Outcome
- growthe2
- Direction
- completely inhibitede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e1“water deficits were imposed by withholding water”
e2“Osmotic adjustment of several hundred kilo‐pascals maintained turgor at or above that of controls, but growth was completely inhibited”
Claim · model-written summary
Total extension of leaf strips was linearly related to the rate of leaf expansion.
- Taxon
- Vitis viniferaVitis viniferae0
- Organ / stage
- leafe4
- Outcome
- Total extensione4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e4“Total extension (elastic and plastic components) under 20‐ or 30‐g loads was linearly related to the rate of leaf expansion determined prior to sampling”
Claim · model-written summary
Plastic extension was linearly related to the rate of leaf expansion.
- Taxon
- Vitis viniferaVitis viniferae0
- Organ / stage
- leafe5
- Outcome
- Plastic extensione5
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e5“Plastic extension was linearly related to the rate of leaf expansion”
Claim · model-written summary
Total extension of well-watered leaves followed a diurnal pattern, minimal near midnight and high in the light.
- Taxon
- Vitis viniferaVitis viniferae0
- Organ / stage
- well‐watered leavese6
- Outcome
- Total extensione6
- Qualifier
- minimum extensibility near midnight and high extensibility in the lighte6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e6“Total extension of well‐watered leaves exhibited a diurnal pattern, with a minimum extensibility near midnight and high extensibility in the light”
Claim · model-written summary
Extensibility of grape leaf tissue decreased with the rate of expansion as leaves aged.
- Taxon
- Vitis viniferaVitis viniferae0
- Organ / stage
- grape leaf tissuee7
- Outcome
- extensibilitye7
- Direction
- decreasese7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e7“The results indicate that the extensibility (as determined by Instron analysis) of grape leaf tissue decreases concomitant with the rate of expansion as leaves age”
Claim · model-written summary
Water deficits decreased plastic and elastic extensibility of growing leaves.
- Taxon
- Vitis viniferaVitis viniferae0
- Organ / stage
- growing leavese1
- Treatment
- water deficitse1
- Outcome
- plastic and elastic extensibilitye1
- Direction
- decreasee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“wine grape Vitis vinifera L.”
e1“Similarly, plastic and elastic extensibility decrease when growing leaves are exposed to water deficits”
The same questions in other papers
drought · physiology: water · Vitis vinifera (wine grape)Positive and negative results
3 papers in the same direction as this paper · 6 in the opposite direction
- negative
- negative
- negative
6 papers more in this group
See all 10 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.