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Medicago sativa  L. (alfalfa), a leguminous crop, is vital globally for forage, crop rotation, and soil fertility. Though, the microbiome of alfalfa grown in uncultivated land has not been studied yet. Here, we employed the high-throughput 16S rRNA and  nif H gene amplicon sequencing to unravel the rhizosphere microbiome and nodules endosymbionts of alfalfa grown in poor lawn and coastal sandy soils. The root nodule of alfalfa of coastal sands and poor lawn soil,  Sinorhizobia / Ensifer  accounted for 80.599% and 67.727% of the total microbiome, respectively. The class Actinobacteria (except  Frankiales ) and order  Rhizobiales ,  Sphingomonadales ,  Burkholderiales ,  Pseudomonas , and  Cytophagia  were found significantly enriched. Culturable studies displayed the dominance of  Bacillus  followed by  Arthrobacter, Microbacterium , and  Streptomyces . Hydroponics studies revealed the efficiency of cultured isolates for nodulation and plant growth attributes. Overall studies decipher the soil indigenous microbiome associated with root nodule and rhizosphere of Alfalfa grown in uncultivated coastal and sandy land.

Temporal dynamics and variation in the alfalfa root nodule and rhizosphere microbial communities of coastal sand and lawn soil