Abstract
The present investigation was undertaken to isolate, screen and evaluate a selected promising PGPR Brevibacillus brevis on cotton crop. Out of 156 bacterial isolates one of the most promising isolate was analyzed for the various PGP traits. A seed germination analysis was conducted with cotton seeds to evaluate the potential of the isolate to promote plant growth. The bacterial isolate was checked for its growth and survival at high temperatures. The isolate was also analyzed for the PGP traits exhibited after the heat treatment. To identify the isolate morphological, biochemical and molecular characterization was performed. The isolate was found positive for many of the PGP attributes like IAA, ARA, anti-fungal activity and ammonia production. Effect of seed bacterization on various plant growth parameters was used as an indicator. The isolate showed significant growth and exhibited various PGP traits at high temperature making it suitable as an inoculant for cotton crop. Isolate was identified as Brevibacillus brevis [SVC(II)14] based on phenotypic as well as genotypic attributes and after conducting this research we propose that the B. brevis which is reported for the first time for its PGP potential in cotton, exerts its beneficial effects on cotton crop through combined modes of actions.
Highlights
Agriculture is the major sector for economic development of third world countries
One promising method to reduce the use of chemical fertilizers is the application of plant growth-promoting rhizobacteria (PGPR) as microbial inoculants in agriculture
Iqbal et al (2016) while carrying out the research under saline field conditions found that the Indole acetic acid (IAA) producing rhizobacteria significantly enhanced the growth, physiology and yield of Maize plants
Summary
Agriculture is the major sector for economic development of third world countries. To improve crop yield in an integrated plant nutrient management system the use of different biological approaches is becoming popular as an important additive to chemical fertilizers. One promising method to reduce the use of chemical fertilizers is the application of plant growth-promoting rhizobacteria (PGPR) as microbial inoculants in agriculture. PGPR has a potential role in developing sustainable crop production systems (Zahid et al 2015). PGPR inhabit plant roots and exert a positive effect ranging from direct influence mechanisms to an indirect effect. PGPR can support the health of plants by improving soil fertility, nutrient availability and its uptake
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