IBAM   22618
INSTITUTO DE BIOLOGIA AGRICOLA DE MENDOZA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Carbon allocation promoted by gibberellins and ABA in roots and berries of grapevine
Autor/es:
MORENO, D.; BERLI, F.; PICCOLI, P.; BOTTINI, R.
Lugar:
Mendoza, Argentina
Reunión:
Congreso; XXVIII Reunión Científica Anual de la Sociedad de Biología de Cuyo, II Reunión Científica Anual de la Dirección de Investigación, Ciencia y Técnica del Ministerio de Salud del Gobierno de Mendoza; 2010
Institución organizadora:
Sociedad de Biología de Cuyo y la Dirección de Investigación, Ciencia y Técnica del Ministerio de Salud del Gobierno de Mendoza
Resumen:
Carbon allocation within grapevines may affect berries growth and development, where wine’s quality is directly related to sugar content in berries. Gibberellins (GAs) and abscisic acid (ABA) control various processes across the plant life and both have been involved in assimilate production and transport in different species. Hence, this work studied the distribution of sucrose, fructose, glucose and starch in grapevine at the phenological stage of veraison after foliar application of GA3, ABA and paclobutrazol, an inhibitor of GAs biosynthesis. The results demonstrated that GA3 increased total grapevine mass, and carbon allocation was driven towards the whole grapevine as structural and soluble carbohydrates, enhancing the aerial part to root ratio. PBZ augmented grapevine’s mass, diminished aerial part to root ratio, and allocated more carbohydrates in roots (sucrose and starch). Both GA3 and ABA increased glucose and fructose in berries (up to 10-fold) and roots (up to three-fold). However GA3 increased the overall carbon fixation while ABA did not. Such results indicate that GAs are involved in stimulation of carbon fixation and transport while ABA as stress signal only enhances sugar transport; notwithstanding the two hormones promoted carbon allocation towards organs involved in plant’s survival, roots and berries.