Metabolism of indole-3-acetic acid (IAA) and other auxins from Bradyrhizobium japonicum E109

TORRES, DANIELA; BENAVIDEZ, ILIANA; OBANDO, MELISSA; GUALPA, JOSE; CASSAN, FABRICIO

Workshop; II Workshop Latinoamericano sobre PGPR; 2014

In Argentina, B. japonicum E109 strain is the only one recommended by SENASA for the formulation of inoculants for soybean. In this strain, it has been confirmed the existence of numerous mechanisms for promoting plant growth, both in life and in symbiotic interaction with non-legumes. Such mechanisms include the ability to fix nitrogen and produce phytohormones, mainly auxins, gibberellins and cytokinins. In particular, the indole-3-acetic acid (IAA) plays a key role on the nodules in terms of development and ontogeny and together with cytokinins has been extensively studied too. Even though we know much about biosynthesis of auxins in these bacteria, very little is known about its ability to conjugate these molecules with sugars or amino acids, hydrolyze or catabolize those molecules, which together is defined as bacterial metabolism of auxins.