אסיף מאגר המחקר החקלאי

ABA application during flowering and fruit set reduces berry number and improves cluster uniformity

Year:

2017

Source of publication :

Authors :

Volume :

68

Co-Authors:

Padmalatha, K., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Weksler, H., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Mugzach, A., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Acheampong, A.K., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Zheng, C., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Halaly-Basha, T., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Or, E., Institute of Plant Sciences, Department of Fruit Tree Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel

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Abstract:

The major drawback of the early ripening Vitis vinifera cv. Early Sweet is its cluster compactness and significant variability in berry size. Here, we tested the ability of abscisic acid (ABA) to reduce the number of berries per cluster and improve berry size uniformity. Data collected from a commercial vineyard over three successive growing seasons suggest that ABA application significantly reduces berry number per cluster in a concentration-dependent manner, improves uniformity of berry size within clusters, and has no significant effect on rachis length. The results also suggest that the thinning effect of ABA depends on the bloom status of the inflorescence, with limited or no effect when applied at preanthesis and with a significant effect when applied at full bloom and soon after anthers are detached. Accordingly, the effects of a semicommercial application of ABA on berry number and size was significantly affected by asynchronous blooming. Completion of bloom may serve as a clear phenological marker for optimal timing of ABA application for uniform and effective thinning. © 2017 by the American Society for Enology and Viticulture. All rights reserved.

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