ABSTRACT
Role of salicylic and jasmonic acid in grapevine buds dormancy release induced by different dormancy-breaking agents

María Armida Orrantia-Araujo1, Miguel Ángel Martínez-Téllez2, Marisela Rivera-Domínguez1, Consuelo Guadalupe Corrales-Maldonado1, Emmanuel Aispuro-Hernández2, and Irasema Vargas-Arispuro1*
 
Grapevine plants (Vitis vinifera L.) enter a dormant state during winter, and both exogenous and endogenous factors regulate their release. This study analyzed the effects of 4% hydrogen cyanamide (HC) and 10% garlic extract (GE) on the levels and signaling pathways of salicylic acid (SA) and jasmonic acid (JA) under forced dormancy-breaking conditions to break dormant buds of ‘Flame seedless’ grapevines. The buds treated with GE showed the highest bud break percentage at 64%, while the HC-treated and control buds showed 53% and 54%, respectively. The GE-treated buds exhibited the highest levels of SA at 10.3 g g-1 FW, while the HC-treated buds had the highest levels of JA at 44 mg g-1 FW. Increased expression of the signaling genes for both hormones confirmed their signaling pathways. Consequently, endogenous SA and JA play critical roles during the release of grapevine bud dormancy, and the dormancy-breaking agents can modulate their levels and signal differentially.
Keywords: Defense hormones, garlic extract, hydrogen cyanamide.
1Centro de Investigación en Alimentación y Desarrollo, A. C., Coordinación de Ciencias de los Alimentos, C.P. 83304. Hermosillo Sonora, México.
2Centro de Investigación en Alimentación y Desarrollo, A. C., Coordinación de Ciencias de los Alimentos de Origen Vegetal, C.P. 83304. Hermosillo, Sonora, México.
*Corresponding author (iris@ciad.mx)