Exploiting plant growth-promoting Amycolatopsis sp. in chickpea and sorghum for improving growth and yield
Alekhya, Gottumukkala | Gopalakrishnan, Subramaniam
In an attempt to identify plant growth-promoting (PGP) actinomycetes other than Streptomyces sp., from rhizosphere soils of chickpea and sorghum, a total of 37 actinomycetes were isolated and evaluated for their PGP traits. Of which, one isolate BCA-696 was found to produce PGP traits including indole acetic acid (IAA), siderophore, cellulase, lipase, protease, chitinase, hydrocyanic acid and-1, 3glucanase. BCA-696 was found to tolerate wide range of pH, temperature, NaCl concentrations and fungicides. BCA-696 was identified as Amycolatopsis sp. in 16S rDNA analysis. On chickpea, under greenhouse and field conditions, BCA596 enhanced the root length, root volume, shoot weight, root weight, nodule number, pod number, seed weight, stover yield and grain yield over the un-inoculated control. BCA696 also enhanced PGP traits on sorghum, under field conditions, including the leaf area, stem weight, root weight, plant weight, grain yield and stover yield over the uninoculated control. The rhizosphere soils of both chickpea and sorghum were also found to enhance total N, available P and % organic C in BCA-696 treated plots over un-inoculated control plots. BCA-696 was found to colonize both chickpea and sorghum roots in scanning electron microscope analysis. This is the first report on the role of Amycolatopsis sp. in PGP on chickpea and sorghum.
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