Tesis Doctorado
Brassinosteroids as a tool for color improvement in red table grapes (Vitis vinifera L.)
Fecha
2019Autor
Pérez Donoso, Alonso Gastón
Alcalde Furber, José Antonio
PONTIFICIA UNIVERSIDAD CATOLICA DE CHILE
Institución
Resumen
The ripening of berries is a complex process which is strongly influenced by environmental factors and controlled endogenously. Within which endogenous control, various hormones participate, however, little is known about the role of the brassinosteroids. This work evaluated the effect of application of various analogs of brassinosteroids on ripening in table grapes cv. ‘Redglobe’ and ‘Crimson Seedless’. The results reveal that brassinosteroids are able to accelerate the ripeness of berries, increasing the content of soluble solids and anthocyanins. The increase in anthocyanins occurred preferentially towards di-hydroxylated anthocyanins (cyanidin-3-glucoside and peonidin-3-glucoside), which are responsible for red and pink color of berries. Additionally, a significant increase in the external color of berries (expressed as Color Index for Red Grape color; CIRG) was observed. Finally, this work was the first report of the use of brassinosteroids in table grapes in a productive context, showing the potential of growth regulators, analogous to brassinosteroids, as a tool for color improvement in table grapes.