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Changes in glutathione and glutathione disulfide content in dormant grapevine buds treated with garlic compound mix to break dormancy

Orrantia-Araujo, M.A., Martínez-Téllez, M.A., Corrales-Maldonado, C., Rivera-Domínguez, M., Vargas-Arispuro, I.
Scientia horticulturae 2019 v.246 pp. 407-410
Vitis vinifera, buds, cell growth, chilling requirement, cold, cultivars, dormancy breaking, garlic, glutathione, hydrogen cyanamide, mixing, plant growth, sulfur, table grapes, vines, winter
The consecutive annual use of a mixture of naturally occurring garlic compounds (GCs) as a dormancy-breaking treatment in table grape (Vitis vinifera L.) cultivars that did not yet meet their chilling requirement has led to an improvement in the productivity of the vines. This study tested the hypothesis that the sulfur molecules contained in the garlic compound mixture stimule an increase in glutathione content. Therefore, the reduced glutathione (GSH) and oxidized glutathione (GSSG) content in dormant buds of grapevine cv. Flame seedless from two consecutive winter seasons (2013/2014 and 2014/2015) were quantified following GCs and hydrogen cyanamide treatments. The GSH content was increased by both treatments, with similar patterns and timing but to different extents. Specifically, the buds of the 2013/2014 season, which accumulated less cold naturally, presented significant changes in GSH content, and consequently, a higher GSH:GSSG ratio was measured in the buds treated with GCs. Lower values of GSSG than GSH were quantified in the buds from both winters following GC treatment. The results suggest that the sulfur compounds contained in GCs have an important influence on the accumulation of the reduced form of glutathione (GSH), thus, maintaining a high GSH:GSSG ratio, which has been associated with plant growth and more specifically rapid cell growth.