Polyamine catabolism involved in response to salt stress in soybean hypocotyls

MARIA PAULA CAMPESTRE; SANTIAGO JAVIER MAIALE; CESAR DANIEL BORDENAVE; ANDRES ALBERTO RODRIGUEZ; OSCAR ADOLFO RUIZ

Valencia, España

Congreso; The Third meeting of FA0605 "Plant Abiotic Stress: from signalling to crop improvement".; 2010

Soybean (Glycine max (L.) Merr) is the main crop in Argentine, reaching 19000000 hectares with an estimated production of 55 million tonnes in 2010. In Argentina, between 2 and 5 million hectares are affected by salts in agricultural areas the Pampas region. Plants response to salinity stress modified levels of metabolites, including polyamines. Polyamines are ubiquitous compound involucrate in grown and development. The most common polyamines are Putrescine (Put), Cadaverine (Cad), Spermidine (Spd) and Spermine (Spm). Polyamine catabolism involves to polyamine oxidase (PAO) and diamine oxidase (DAO). Soybean polyamines are deaminated by DAO, generating H2O2, NH3 and the corresponding aminealdehyde in apoplastic compartment (Gamarnik y Frydman 1991). The accumulation of polyamines is a general response in plant under salt stress (Maiale et al. 2004). In turn, salinity increase DAO activity in soybean root (Xing et al. 2007), and this enzyme is involve in elongation of soybean hypocotyls in non-salinized plants  (Delis et al. 2006).In this works, we evaluated the involvement of DAO in soybean hypocotyls elongation under salt stress.