Changes elicited by Rhizobium inoculation in expression of genes influenced by phytohormones levels.

HIRSCH, A.M., LUM, M.R. GIORDANO, W., FUJISHIGE, N.A. AND WOO, H.H.

Biology of Plant-Microbe Interactions

International Society for Molecular Plant-Microbe Interactions

Lugar: St. Paul, Minnesota, USA; Año: 2004; p. 383 - 388

In response to rhizobial inoculation, numerous changes occur in legume root cells, particu­larly with respect to the endogenous levels of different phytohormones. Earlier, we reported that several ENOD genes are up-regulated by both Nod factor and cytokinin. Recently, we described the isolation of a gene that encodes a protein with a RING-H2 finger motif (MsRH2-1) and are now examining expansin gene expression in Sinorhizobium meliloti-inoculated white sweet clo­ver (Melilotus alba) roots. Proteins with RING-H2 finger domains are reported to be involved in substrate degradation pathways via ubiquination. Expansins are a highly conserved group of cell wall-localized proteins that appear to mediate changes in cell wall plasticity during cell expansion or differentiation. We have also revisited the question as to whether endogenous flavonoids serve as mediators of nodule development.