Aeschynomene indica -Nodulating Rhizobia Lacking Nod Factor Synthesis Genes: Diversity and Evolution in Shandong Peninsula, China

Abstract

Aeschynomene indica rhizobia (AIRs) can form both root and stem nodules via Nod factor-independent processes, which distinguishes them from other rhizobia. This study systematically uncovered the diversity and community composition of A. indica rhizobia distributed in eastern China. Our results reclassified all the A. indica rhizobia across the world and represent a useful contribution to evaluating the diversity and distribution of the symbiont. The presence of novel genospecies specifically distributed in China enriched the A. indica rhizobia resources and provided insight into the geographic distribution of rhizobia. The phylogenetic relationship between nifH and pufLM of A. indica rhizobia across the world provides insight into the evolution of their nitrogen fixation and photosynthetic abilities.