Abstract
BackgroundAuxin production by bacteria is one of the most important direct mechanisms utilized by plant growth-promoting bacteria (PGPB) for the betterment of plants naturally because auxin is a plant friendly secondary metabolite synthesized naturally by bacteria, and hence improves the growth of associated plants. So, the current study focuses on bacterial synthesis of Indole-3-acetic acid (IAA) for plant growth improvement.MethodsIn the current study, the PGPB were selected on the basis of their auxin production potential and their growth promoting attributes were evaluated. Indole-3-acetic acid producing potential of two selected bacterial isolates was observed by varying different growth conditions i.e., media composition, carbon sources (glucose, sucrose and lactose) and different concentrations of precursor. Influence of various physiological factors (temperature and incubation time period) on IAA production potential was also evaluated.ResultsBoth the bacterial strains Bacillus cereus (So3II) and B. subtilis (Mt3b) showed variable potential for the production of bacterial IAA under different set of growth and environmental conditions. Hence, the IAA production potential of the bacterial isolates can be enhanced by affecting optimum growth conditions for bacterial isolates and can be used for the optimal production of bacterial IAA and its utilization for plant growth improvement can lead to better yield in an eco-friendly manner.
Highlights
Plant hormones are substantial for plant growth and development this was revealed in the era of Darwin who successfully study behavior, translocation and development of one of the most important phytohormone named Auxin
The auxin production potential of these bacterial isolates was checked and only two bacterial strains i.e., So3II and Mt3b were selected on the basis of their high auxin production potential, both in the presence and absence of precursor i.e., tryptophan
Both the isolated strains were identified as Bacillus
Summary
Plant hormones are substantial for plant growth and development this was revealed in the era of Darwin who successfully study behavior, translocation and development of one of the most important phytohormone named Auxin. There are seven types of phytohormones that directly and indirectly influence plant growth and development and very important in plant life. All these phytohormones are naturally produced by plants and procured from soil and microbiota (Park et al, 2017; Tanimoto, 2005). The current study focuses on bacterial synthesis of Indole-3-acetic acid (IAA) for plant growth improvement. Methods: In the current study, the PGPB were selected on the basis of their auxin production potential and their growth promoting attributes were evaluated. The IAA production potential of the bacterial isolates can be enhanced by affecting optimum growth conditions for bacterial isolates and can be used for the optimal production of bacterial IAA and its utilization for plant growth improvement can lead to better yield in an eco-friendly manner
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