Isolation of a pink-pigmented facultative methylotrophic bacteria and its growth-promoting effect on pepper plants

摘要

Microorganisms offer a low-cost, eco-friendly alternative to chemical fertilizers. A pink-pigmented facultative methylotrophic bacterium Gen-B2 was isolated from sugarcane rhizosphere and its growth-promoting activity was detected using in vitro experiments. Based on morphological, biochemical and molecular characteristics, Gen-B2 was identified as Methylobacterium populi. Pepper seedling inoculation significantly benefitted shoot/root fresh/dry weight, plant height, chlorophyll content and average true leaf number. Determination of activities related to growth promotion indicated that Gen-B2 promoted plant growth through nitrogen fixation and indole acetic acid synthesis. The present study suggests that this bacterium has great potential to be used as a bioinoculant for sustainable cultivation.

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