Abstract
Net CO(2) assimilation rate (A), stomatal conductance (g(s)), and weight per unit leaf area (W) were determined on Thompson Seedless grapevines grown in the field. Treatments included fruit set applications of gibberellic acid (40 milligrams gibberellic acid (GA(3)) per liter) to vines, shoots and clusters, alone and in combination with trunk girdling. Leaf A and g(s) were measured prior to and 3, 6, and 13 days after fruit set. Weight per unit leaf area was determined on leaves collected subsequent to gas exchange measurements. Leaf A of girdled vines was reduced approximately 30% when compared to the control 13 days after treatment. The reduction in A due to girdling was not as great when vines were sprayed with GA(3). GA(3) sprays alone had no significant effect on A. Stomatal conductance was reduced by girdling 13 days after treatment. Weight per unit leaf area was 17% greater for trunk girdled vines when compared to the controls. Results indicate GA(3) affected net CO(2) assimilation rate only on girdled vines, a treatment which increased weight per unit leaf area.
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Claims 5
Claim · model-written summary
Leaf CO2 assimilation of girdled vines was reduced about 30% relative to control vines 13 days after treatment.
- Material
- Thompson Seedlesse0
- Treatment
- girdlede1
- Outcome
- Leaf Ae1
- Direction
- reducede1
- Value
- approximately 30%e1
- Comparator
- the controle1
- Setting
- in the fielde0
VitisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine Leaves”
e0“Thompson Seedless grapevines grown in the field”
e1“Leaf A of girdled vines was reduced approximately 30% when compared to the control 13 days after treatment”
Claim · model-written summary
GA3 sprays made the girdling-induced reduction in CO2 assimilation less pronounced.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine Leaves”
e2“The reduction in A due to girdling was not as great when vines were sprayed with GA(3)”
Claim · model-written summary
GA3 sprays alone had no significant effect on CO2 assimilation.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine Leaves”
e3“GA(3) sprays alone had no significant effect on A”
Claim · model-written summary
Stomatal conductance was reduced by girdling 13 days after treatment.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine Leaves”
e4“Stomatal conductance was reduced by girdling 13 days after treatment”
Claim · model-written summary
Weight per unit leaf area was 17% greater for trunk girdled vines than for controls.
- Treatment
- trunk girdled vinese5
- Outcome
- Weight per unit leaf areae5
- Direction
- greatere5
- Value
- 17%e5
- Comparator
- the controlse5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Grapevine Leaves”
e5“Weight per unit leaf area was 17% greater for trunk girdled vines when compared to the controls”
The same questions in other papers
pruning · physiology: gas exchange · VitisResults differ
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
1 paper more in this group
See all 5 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.