Legume Signals to Rhizobial Symbionts: A New Approach for Defining Rhizosphere Colonization

摘要: Classic observations describe distinctive relationships that have evolved between roots and their associated microbes:1 (1) The rhizosphere, an imprecisely defined zone near, on, within the root, contains much higher numbers of total bacteria than root-free soil; (2) healthy plant growing in soil normally are colonized by a limited number bacterial species, which include few pathogens. Detailed field studies with mangel2 soybean3 showed physiological traits heterotrophic isolated from rhizosphere differ markedly those terms amino acid nutrition, carbon metabolism, extracellular enzymatic activities, resistance to antimicrobial compounds. Despite such indications striking, potentially beneficial microbial communities develop around roots, our knowledge genetic microbes confer competence4 is limited. A better understanding factors controlling could help establish superior strains microsymbionts, as Rhizobium Bradyrhizobiwn, might suppress growth pathogens, make it possible populations genetically altered degrade crop pesticides or fulfill other agriculturally useful roles.