Article ID Journal Published Year Pages File Type
4567368 Scientia Horticulturae 2013 7 Pages PDF
Abstract

The response of dormancy release of “Anna” apple buds, carbohydrate metabolism and hydrolytic enzymes activities to 13-year-old trees foliar application with onion extract was investigated. Selected trees were sprayed with four extract rates (50, 100, 150 and 200 ml l−1) and tap water as a control. Our results showed that breaking bud dormancy increased as the extract concentration increased. Increases in reducing sugars and hydrolytic enzymes (α-amylase and invertase) activities, and reductions in non-soluble carbohydrates and non-reducing sugars were correlated with the increase in the percentage of floral bud break and the reduction in flowering duration as a result in the extract application. The variance in the timing of soluble sugars accumulation/exhaustion processes in the extract treated-trees and the control may be accounted for the variance in flowering duration and floral bud break timing. The best results were obtained with the extract concentration of 200 ml l−1, which could be recommended for early and high floral bud break percentage by regulating the metabolism of carbohydrates and the activities of hydrolytic enzymes in apple floral buds.

► “Anna” apple bud break% maximized with onion extracts foliar application. ► Onion extracts hastened bud break and shortened flowering duration. ► Carbohydrate metabolism improved in buds by onion extract. ► Onion extract play an important role in bud release from dormancy.

Related Topics
Life Sciences Agricultural and Biological Sciences Horticulture
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