Browsing by Author "Vergara Valderrama, Alexis Esteban"

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    Brassinosteroids as a tool for color improvement in red table grapes (Vitis vinifera L.).
    (2019) Vergara Valderrama, Alexis Esteban; Pérez Donoso, Alonso Gastón; Pontificia Universidad Católica de Chile. Facultad de Agronomía e Ingeniería Forestal
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    Exogenous Applications of Brassinosteroids Improve Color of Red Table Grape (Vitis vinifera L. Cv. “Redglobe”) Berries
    (2018) Vergara Valderrama, Alexis Esteban; Alcalde Furber, José Antonio; Pérez Donoso, Alonso Gastón; Díaz, Katy; Carvajal, Rodrigo; Espinoza Catalán, Luis Javier
    Color and other quality parameters of “Redglobe” grape (Vitis vinifera L.) berries were evaluated after treatment with brassinosteroid (BR) analogs. Three BRs analogs (24-epibrassinolide, Triol, or Lactone) were applied at three concentrations (0.0, 0.4, or 0.8 mg⋅L-1), at the onset of veraison. A commercial formulation (B-2000®) was also applied, at a recommended rate of 0.06 mg⋅L-1. The tested BR analogs were effective improving berry color (evaluated as color index for red grapes, CIRG), increasing the levels of soluble solids and anthocyanins, and changing the types of anthocyanins present without altering other quality and yield parameters. The effects of BR analogs on color enhancement could be explained by an increase in soluble solids content and/or anthocyanin content. Treatment with 24-epibrassinolide (at 0.4 mg⋅L-1) or the commercial formulation tended to favor the production of dihydroxylated anthocyanins, which are responsible for the red and pink colors of grape berries. Results indicate that the use of BRs constitutes a potential tool in the production of table grapes. This is the first report of this enhancement effect in a productive context.