Sulfur-Oxidizing Bacteria From Coal Mine Enhance Sulfur Nutrition in Pigeonpea (Cajanus cajan L.)

• DOI: 10.3389/fenvs.2022.932402
• Publication Date: 2022-07-11T04:33:11Z
• Authors: Deepti Malviya; Ajit Varma; Udai B. Singh; Shailendra Singh; Harsh V. Singh; Anil K. Saxena
• Keywords: Stenotrophomonas maltophilia; Stenotrophomonas; Cajanus

The present investigation was carried out to isolate, identify, and characterize sulfur-oxidizing bacteria (SOB) from coal mines evaluate the efficient strains for their ability influence plant growth S uptake in pigeonpea. Thirteen bacterial isolates belonging Stenotrophomonas maltophilia (2), pavanii Rhizobium pusense (5), Bacillus velezensis Paenibacillus massiliensis (2) were obtained. Among these, seven that could reduce pH of thiosulfate broth further characterized sulfur oxidation, growth-promoting (PGP) attributes, planta studies. characterized, maximum sulfate ion recorded . DRC-18-7A (311.43 mg L −1 ) closely followed by DRC-18-7B (273.44 DRC-18-10 (265.75 after 21 days inoculation. PGP attributes quantified, P solubilization case (24.39 μg ml ), while highest siderophore production IAA (14.25%) R DRC-18-25 (15.21 respectively. outperformed others enhancing seed germination (%) vigour indices. Results clearly indicated microbial inoculants colonized roots developed biofilm on root surface. It observed plants treated with induce an early formation secondary tertiary pigeonpea compared untreated control which confirmed assessing architecture using scanner. Inoculation these two significantly enhanced parameters, activity reactive oxygen scavenging (ROS) enzymes, accumulation flavonoids, carotenoids, proline both under sterilized non-sterilized medium (sand soil 1:3 ratio). application increased nitrogen, phosphorus, potassium, shoots. Further, transcript level phosphate, transporter genes increases upon inoculation leading translocation P, K, results indicate be recommended as improve its nutrition.