Abstract
To elucidate the effects of developmental xylem discontinuity in grape (Vitis vinifera L.) berries, greenhouse-grown Pinot noir vines bearing pre- or post-veraison clusters were subjected to water stress or peduncle girdling/ detaching. Berry growth rate (change in diameter per day) and deformability were measured as indicators of berry water status. Berry diameter increased slightly in pre-veraison clusters on well watered vines; diameters of berries on unwatered vines decreased significantly. Pre-veraison berry deformability was four times greater in unwatered versus watered vines on the final day of the experiment. Bagging pre-veraison clusters to slow transpiration had little effect on berry growth rate or deformability. Post-veraison berry growth rate and deformability were not affected significantly by vine water stress. Heat girdling cluster peduncles decreased pre-veraison berry growth rates by 75%, but had a negligible effect on berry deformability. Diameter loss in post-veraison berries was increased by 40% after girdling; berry deformability increased by 44%. The rate of berry diameter loss on a detached cluster was almost three times higher, and berry deformability 26% higher, than the same measurements taken from a girdled cluster. A xylem discontinuity in the berry near veraison is consistent with these findings.
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Claims 11
Claim · model-written summary
Preveraison berry diameter rose slightly in well watered vines.
Verbatim
e0“Berry diameter increased slightly in pre-veraison clusters on well watered vines”
t0“Grape Berry”
Claim · model-written summary
Preveraison berry diameter declined significantly in unwatered vines.
Not reportedComparator
Verbatim
e0“diameters of berries on unwatered vines decreased significantly”
t0“Grape Berry”
Claim · model-written summary
Preveraison berry deformability was four times higher in unwatered than watered vines on the final day.
Verbatim
e0“Pre-veraison berry deformability was four times greater in unwatered versus watered vines on the final day of the experiment”
t0“Grape Berry”
Claim · model-written summary
Bagging preveraison clusters had little effect on berry growth rate or deformability.
- Taxon
- grapet0
- Treatment
- Bagging pre-veraison clusterse0
- Outcome
- berry growth rate or deformabilitye0
- Direction
- little effecte0
Not reportedComparator
Verbatim
e0“Bagging pre-veraison clusters to slow transpiration had little effect on berry growth rate or deformability”
t0“Grape Berry”
Claim · model-written summary
Postveraison berry growth rate and deformability were not significantly affected by vine water stress.
- Taxon
- grapet0
- Treatment
- vine water stresse0
- Outcome
- berry growth rate and deformabilitye0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“Post-veraison berry growth rate and deformability were not affected significantly by vine water stress”
t0“Grape Berry”
Claim · model-written summary
Peduncle heat girdling decreased preveraison berry growth rate by 75%.
- Taxon
- grapet0
- Treatment
- Heat girdling cluster pedunclese0
- Outcome
- pre-veraison berry growth ratese0
- Direction
- decreasede0
- Value
- 75%e0
Not reportedComparator
Verbatim
e0“Heat girdling cluster peduncles decreased pre-veraison berry growth rates by 75%”
t0“Grape Berry”
Claim · model-written summary
Peduncle heat girdling had negligible effect on berry deformability.
Not reportedTreatmentComparator
Verbatim
e0“but had a negligible effect on berry deformability”
t0“Grape Berry”
Claim · model-written summary
Girdling increased postveraison berry diameter loss by 40%.
Not reportedComparator
Verbatim
e0“Diameter loss in post-veraison berries was increased by 40% after girdling”
t0“Grape Berry”
Claim · model-written summary
Girdling increased postveraison berry deformability by 44%.
Not reportedTreatmentComparator
Verbatim
e0“berry deformability increased by 44%”
t0“Grape Berry”
Claim · model-written summary
Detached clusters lost berry diameter almost three times faster than girdled clusters.
Verbatim
e0“The rate of berry diameter loss on a detached cluster was almost three times higher, and berry deformability 26% higher, than the same measurements taken from a girdled cluster”
t0“Grape Berry”
Claim · model-written summary
Detached cluster berry deformability was 26% higher than in girdled clusters.
Not reportedTreatment
Verbatim
e0“berry deformability 26% higher, than the same measurements taken from a girdled cluster”
t0“Grape Berry”
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