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Photosynthetic  Bradyrhizobium  strain ORS285 forms nitrogen-fixing nodules on the roots and stems of tropical aquatic legumes of the  Aeschynomene  genus. Depending on the  Aeschynomene  species, this symbiotic interaction does or does not rely on the synthesis of Nod-factors (NFs). However, whether during the interaction of  Bradyrhizobium  ORS285 with NF-independent  Aeschynomene  species the  nod  genes are expressed and if the general regulator NodD plays a symbiotic role is unknown. Expression studies showed that in contrast to the interaction with the NF-dependent  Aeschynomene  species,  A .  afraspera , the  Bradyrhizobium  ORS285  nod  genes are not induced upon contact with the NF-independent host plant  A .  indica . Mutational analysis of the two  nodD  genes present in ORS285, showed that deletion of  nod D1 and  nod D2 did not affect the symbiotic interaction between  Bradyrhizobium  ORS285 and  A .  indica  whereas the deletions had an effect on the symbiotic interaction with  A .  afraspera  plants. In addition, when the expression of  nod  genes was artificially induced by adding naringenin to the plant growth medium, the nodulation of  A .  indica  by  Bradyrhizobium  ORS285 is delayed and resulted in lower nodule numbers.

NodD1 and NodD2 Are Not Required for the Symbiotic Interaction of Bradyrhizobium ORS285 with Nod-Factor-Independent Aeschynomene Legumes