Net CO2 Assimilation Rate of Grapevine Leaves in Response to Trunk Girdling and Gibberellic Acid Application
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TLDR
Results indicate GA(3) affected net CO(2) assimilation rate only on girdled vines, a treatment which increased weight per unit leaf area.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.read more
Citations
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Journal ArticleDOI
Effect of fruit load and girdling on leaf photosynthesis in Mangifera indica L.
TL;DR: It is concluded that girdling and high fruit load affect photosynthesis permanently by decreasing and increasing, respectively, leaf nitrogen concentration and photosynthetic capacity.
Journal ArticleDOI
Net CO2 Assimilation and Carbohydrate Partitioning of Grapevine Leaves in Response to Trunk Girdling and Gibberellic Acid Application
Teryl R. Roper,Larry E. Williams +1 more
TL;DR: The data indicate that the reduction in A of girdled grapevines is not associated with the accumulation of leaf nonstructural carbohydrates following the girdling treatment.
Journal ArticleDOI
Girdling effects on fruit set and quantum yield efficiency of PSII in two Citrus cultivars.
TL;DR: It is concluded that the delay in fruitlet abscission and the increase in Phi(PSII)observed in girdled leafy flowering shoots are the mechanisms underlying the enhancement of fruit set after girdling.
Journal ArticleDOI
Water use of Thompson Seedless grapevines as affected by the application of gibberellic acid (GA3) and trunk girdling – practices to increase berry size
Larry E. Williams,J. E. Ayars +1 more
TL;DR: The results indicate that girdling the trunks of grapevines can affect water use when compared to non-girdled grapevine and the K c of this perennial horticultural crop does not decrease after harvest or later in the season if the vines are fully irrigated and insect pests are controlled.
Journal ArticleDOI
Midday measurements of leaf water potential and stomatal conductance are highly correlated with daily water use of Thompson Seedless grapevines
TL;DR: In this article, a study was conducted to determine the relationship between midday measurements of vine water status and daily water use of grapevines measured with a weighing lysimeter, and the results indicated that even modest water stress can greatly reduce grapevine water use and that short-term measures of grape water status taken at midday are a reflection of daily grapevine usage.
References
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Journal ArticleDOI
Effect of Obstructed Translocation on Leaf Abscisic Acid, and Associated Stomatal Closure and Photosynthesis Decline
TL;DR: It is suggested that the mechanism of increased leaf ABA levels following translocation-obstruction may be due to an interference with normal translocation of ABA out of leaves.
Journal ArticleDOI
Effects of Gibberellin on Photosynthesis in Red Clover ( Trifolium pretense L.)
K. J. Treharne,J. L. Stoddart +1 more
TL;DR: Support is given to the argument that photosynthetic activity of leaves is related to, and can be limited by, the biochemistry of the system, even in conditions of light saturation.
Journal ArticleDOI
Effect of Growth Regulators on CO2 Assimilation in Leaves, and its Correlation with the Bud Break Response in Photosynthesis
R. G. S. Bidwell,Wendy B. Turner +1 more
TL;DR: The reaction caused by IAA is very similar to that caused by the breaking of dormancy of a bud, which indicates that the bud break response in CO(2) assimilation in leaves is caused by auxin synthesized in a bud as it begins to grow, and exported into adjacent leaves.
Journal ArticleDOI
Relation of Seededness and Ringing to Gibberellin-like Activity in Berries of Vitis vinifera.
Robert J. Weaver,Robert Pool +1 more
TL;DR: Since both ringinlg and treatment wvith gibberellins result in enlarged fruiit, it is likely that riniging may affect the size of fruit resuilts from the ilncreased suppl)l of elaborated food miiaterial trappe(l above the rinLg.
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