Abstract
The induction of osmotic adjustment was studied in the grapevine varieties Silvaner, Riesling and Bacchus in the field andin the glasshouse. • After cyclic drought and irrigation periods the osmotic potential (Ψs ) of fully expanded Silvaner, not of Riesling leaves, declined corresponding to stress intensity by up to 4 bar. These osmotic changes were accompanied by a degradation of starch in both cultivars and an increase of fructose and glucose in Silvaner. A similar decrease of ΨS was observed also in the roots of stressed Silvaner and Riesling vines. • The apices, not the mature leaves, of field-grown Bacchus vines showed a diurnal cycle of ΨS with a minimum ΨS at 11 h. The ΨS of apices of potted Riesling and Silvaner vines increased and decreased inversely to changes of the vapor pressure deficit of the atmosphere and temperature; a moderate water stress in the soil intensified these reactions. • Cyclic drought and irrigation periods led to a decrease of the cell elasticity in mature leaves of Silvaner and Riesling. Nachweis einer osmotischen Anpassung an Trockenheit bei Reben (Vitis vinifera L.) Die Induktion einer osmotischen Anpassung wurde unter Freiland- und Gewächshausbedingungen bei Reben der Sorten Silvaner, Riesling und Bacchus untersucht. • Zyklische Trocken- und Bewässerungsphasen ließen bei ausgewachsenen Silvanerblättern, nicht jedoch bei Rieslingblättern, das osmotische Potential (ΨS ) entsprechend der Streßintensität um bis zu 4 bar absinken. Mit dieser osmotischen Veränderung gingen in den Blättern beider Sorten ein Abbau der Stärke und bei Silvaner Zunahmen an Glucose und Fructose einher. Eine ähnliche Abnahme des ΨS wurde auch in den Wurzeln gestreßter Silvaner- und Rieslingreben nachgewiesen. • Im Gegensatz zu den ausgewachsenen Blättern von Bacchus-Reben im Freiland war in den Sproßspitzen ein diurnaler Rhythmus des ΨS mit einem Minimum um 11 h zu erkennen. Die ΨS -Werte der Sproßspitzen von Topfpflanzen der Sorten Silvaner und Riesling nahmen mit ansteigenden Temperaturen und zunehmendem Dampfdruckdefizit der Luft ab und mit abnehmenden Temperaturen und sinkendem Dampfdruckdefizit der Luft zu; ein schwacher Wassermangelstreß im Boden verstärkte diese Reaktionen des ΨS · • Zyklische Trocken- und Bewässerungsphasen führten bei ausgewachsenen Blättern der Sorten Silvaner und Riesling zu einer Abnahme der Zellelastizität.
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Claims 10
Claim · model-written summary
Cyclic drought lowered osmotic potential in mature Silvaner leaves by up to 4 bar.
- Material
- Silvanere0
- Organ / stage
- leavese0
- Treatment
- cyclic drought and irrigation periodse0
- Outcome
- osmotic potential (Ψs )e0
- Direction
- declinede0
- Value
- up to 4 bare0
VitisNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After cyclic drought and irrigation periods the osmotic potential (Ψs ) of fully expanded Silvaner, not of Riesling leaves, declined corresponding to stress intensity by up to 4 bar”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Riesling mature leaves did not show the osmotic potential decline seen in Silvaner.
- Material
- Rieslinge0
- Organ / stage
- leavese0
- Treatment
- cyclic droughte1
- Outcome
- osmotic potential (Ψs )e0
- Direction
- note0
- Comparator
- Silvanere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the osmotic potential (Ψs ) of fully expanded Silvaner, not of Riesling leaves, declined corresponding to stress intensity”
e1“After cyclic drought and irrigation periods”
t0“Evidence for osmotic adjustment to drought in grapevines (Vitis vinifera L.)”
Claim · model-written summary
Starch degraded in both Silvaner and Riesling leaves during osmotic changes.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These osmotic changes were accompanied by a degradation of starch in both cultivars”
e1“Riesling leaves”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Fructose and glucose increased in Silvaner.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“an increase of fructose and glucose in Silvaner”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Osmotic potential decreased in stressed Silvaner and Riesling roots.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A similar decrease of ΨS was observed also in the roots of stressed Silvaner and Riesling vines”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Field-grown Bacchus apices showed a diurnal osmotic potential cycle with a minimum at 11 h.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The apices, not the mature leaves, of field-grown Bacchus vines showed a diurnal cycle of ΨS with a minimum ΨS at 11 h”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Mature leaves of field-grown Bacchus lacked the diurnal cycle seen in apices.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The apices, not the mature leaves, of field-grown Bacchus vines showed a diurnal cycle of ΨS”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Apex osmotic potential in potted Riesling and Silvaner varied inversely with atmospheric vapor pressure deficit and temperature.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ΨS of apices of potted Riesling and Silvaner vines increased and decreased inversely to changes of the vapor pressure deficit of the atmosphere and temperature”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Moderate soil water stress intensified the apex osmotic response.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a moderate water stress in the soil intensified these reactions”
t0“grapevines (Vitis vinifera L.)”
Claim · model-written summary
Cyclic drought and irrigation decreased cell elasticity in mature leaves of Silvaner and Riesling.
- Material
- Silvaner and Rieslinge0
- Organ / stage
- mature leavese0
- Treatment
- Cyclic drought and irrigation periodse0
- Outcome
- cell elasticitye0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cyclic drought and irrigation periods led to a decrease of the cell elasticity in mature leaves of Silvaner and Riesling”
t0“grapevines (Vitis vinifera L.)”
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See all 47 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.