Host genes involved in nodulation preference in the

AGUILAR O, BEKER MP, BATTAGLIA M, ZANETTI ME, BLANCO FA, NICOLETTI K, SORIA

Zaragoza

Congreso; XIII Congreso Luso Español de Fij de Nitrogeno SEFIN; 2010

SEFIN Sociedad Española Fijaciòn de Nitrògeno

Summary Common beans (Phaseolus vulgaris) and rhizobia coevolved in the two main centres of host domestication. In order to characterize the symbiosis, the physiology of nodulation was examined in combinations of host x lineages of Rhizobium etli. Analysis of nodulation factors produced by strains of R. etli from both centres of diversification and competitiveness by nolL mutant, suggested that factors other than Nod factors (NFs) might be involved in strain preference. A host gene coding for a subunit of the NF-Y transcriptional factor was identified in the Mesomerican beans and found to be activated in response to inoculation with its cognate rhizobia