Abstract
Utilization of plant growth promoting Rhizobacteria (PGPR) as suitable substitute to chemical fertilizers and also in command to promote the plant growth. Five potential strains were studied for multifarious PGP traits viz. Indole-3-acetic acid (IAA), phosphate (P) solubilization, siderophore production, ammonia production, production of 1-Aminocyclopropane-1-carboxylate deaminase (ACC), phytohormone production, exhibiting antifungal activity etc. All five strains were resulted to have multifarious PGP traits. 2 Consortium were prepared using these PGP traits and effects were tested on Mungbean. The selected isolates showed significant plant growth promotion with respect to increase in root length and number of secondary roots as compared to control. The relative gene expression analysis of three genes ARF (Auxin response factors), ERF (Ethylene-responsive factor 1), GAI (Gibberellic-Acid Insensitive), at a transcriptional level compared to control consortia 2 was better and also increased 5-7 folds in the juvenile root tissues of mungbean using qRT-PCR technique on 15th, 30th and 45th days of interval.
Highlights
Rhizosphere is multifaceted and hostile environment for plant–microbe interactions for exploiting vital major and minor nutrients from wading pool of nutrients
Five potential strains were studied for multifarious PGP traits viz. Indole-3-acetic acid (IAA), phosphate (P) solubilization, siderophore production, ammonia production, production of 1-Aminocyclopropane-1-carboxylate deaminase (ACC), phytohormone production, exhibiting antifungal activity etc
It was observed that range of IAA produced by these rhizobacteria between 42.10 – 83.46 μg/ml in trp- medium and 71.27 -127.84 μg/ml in the trp+ medium on 3rd day of incubation
Summary
Rhizosphere is multifaceted and hostile environment for plant–microbe interactions for exploiting vital major and minor nutrients from wading pool of nutrients. Several studies were conducted to show the effectiveness of coinoculation of Rhizobium with PGPRs on legumes (Abbasi et al 2010). A variety of PGPRs including Bacillus and Pseudomonas species are commonly associated in the rhizosphere of legume as well as non leguminous crops (Muresu et al 2008). The co-inoculation of some Bacillus strains with effective Bradyrhizobium enhanced nodulation and growth of green gram (Vigna radiata L.) (Korir et al 2017). Few studies have confirmed that the inoculation of seed with mixed cultures have tremendous positive effects on plant growth compared to the single strain inoculation. Few studies have confirmed that the inoculation of seed with mixed cultures have tremendous positive effects on plant growth compared to the single strain inoculation. (Xavier and Germida, 2002)
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