CONSTITUTIVE EXPRESSION OF ACC DEAMINASE IN MESORHIZOBIUM LOTI PROMOTES NODULATION

CONFORTE, VALERIA; ECHEVERRÍA, MARIELA; UGALDE, RODOLFO; MENÉNDEZ, ANA; LEPEK, VIVIANA

BIOCELL

Facultad de Ciencias Médicas,

Lugar: Mendoza; Año: 2007 vol. 31 p. 137 - 137

0327-9545

Ethylene inhibits the establishment of symbiosis between rhizobios and legumes. Several rhizobia species express the enzyme ACC deaminase, which degrades ACC (precursor of ethylene) leading to the reduction of the amount of ethylene evolved by the plant. M. loti has a gene that encodes ACC deaminase but it is under the activity of a NifA-rpoN-dependent promoter thus, it is only expressed in the bacteroid form, inside nodule. We wanted to know if the presence of ACC deaminase actiity in the first steps of the M. loti-Lotus interaction could promote the efficiency of the nodulation process.