Gibberellins synthesized by the entomopathogenic bacterium, Photorhabdus temperata M1021 as one of the factors of rice plant growth promotion
2014
Ullah, Ihsan | Khan, Abdur Rahim | Jung, Byung Kwon | Khan, Abdul Latif | Lee, In-Jung | Shin, Jae-Ho
In the present study, different types of gibberellins (GAs) in the culture filtrate (CF) of Photorhabdus temperata M1021 were quantified. The analysis of CF helped in profiling various bioactive GAs: GA ₁, GA ₃, GA ₄, and GA ₇. Several physiologically inactive GAs: GA ₉, GA ₁₂, and GA ₂₀ were detected as well. Siderophore production was also investigated by growing P. temperata M1021 on chrome azurol-S blue agar plates. Furthermore, the strain was inoculated into ‘ Waito -C’ (Oryza sativa L.) rice plants, which significantly (P < 0.05) increased plant growth attributes such as plant length, chlorophyll content, and fresh and dry biomass compared with those in controls. In a separate experiment, canola (Brassica napus L.) seeds treated with CF of M1021 were significantly (P < 0.05) accelerated germination rate as well as biomass production. Findings of the present study suggest that the strain M1021 contributes an important role in the plant growth by synthesizing a wide array of bioactive metabolites.
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