Hormone influence on the expression of strawberry expansin genes

DOTTO MARCELA; MARTINEZ GUSTAVO; CIVELLO PEDRO

Pinamar, Argentina

Congreso; XLI Reunión Anual de SAIB (Sociedad Argentina de Investigación en Bioquímica y Biología Molecular); 2005

SAIB

Since strawberry is a non climateric fruit ethylene is not a major hormone in the control of the ripening process. It is thought that the decline in auxin production towards the end of the growing stages marks the onset of ripening in strawberry. Other hormones such as ABA and giberellins have been detected in straberry fruits and they may have an influence in straberry ripening. Expansins are cell wall proteins which are able to increase cell wall elongation rate and have been related to the process of fruit softening. Hormonal regulation of these proteins in starweberry had not been studied until now, except for FaEXP2 whose expression level was not influenced by ethylene or auxin treatment of the fruits. In order to characterize the possible hormone influence in the expression of expansin genes, we analyzed the efect of ethylene, NAA, GA3, ABA and deachened fruits (achenes are the source of endogenous auxin) in the expression of other strawberry expansin genes