Abstract
Expression ofnodgenes during symbiosis: The expression of inducible nod genes of Rhizobium requires three components: (i) an inducible nod gene promoter, (ii) a functional nodD gene, whose product acts as a positive regulator when activated, and (iii) flavonoid compounds of the plant, which activate the nodD gene product. The chemical nature of the flavonoid inducers, either present in roots or seeds or exuded from theirs have been determined for host plants of several species of Rhizobium and Bradyrhizobium. In general, there are numerous inducers, which differ between plant species, and can contribute to host specificity (13,17). Also, there appear to be differences between different organs of the same plant species, as the seeds of alfalfa exude different inducers to the roots (10,11).
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