Desert bacterium helps pepper plants beat bad soil pH
Chen Y, Wang X, Si Y, Zhang F, Ding K
Soil Health
If your garden soil is stubbornly too acidic or too alkaline and your peppers always look pale and stunted, this points to a living alternative to synthetic iron fertilizers that also builds up the soil around the roots.
Scientists found a tough bacterium living in salty, alkaline desert soil in China that can survive extreme salt and pH conditions most microbes can't handle. When added to pepper plants growing in either very acidic or very alkaline soil, it released iron and other nutrients trapped in the soil, helped the plants grow noticeably bigger, and even nudged overly acidic soil back toward a healthier neutral pH. It worked better than standard iron fertilizers and left the soil's microbial community more diverse and active.
Key Findings
Streptomyces luteus TRM 45540 tolerates 3-9% NaCl and pH 9-12, and increased pepper fresh weight by over 44% in acidic soil compared to untreated controls.
In alkaline soil, root and stem lengths increased 26-91% compared to conventional iron fertilizer treatments (EDDHA-Fe6, ferrous sulfate).
The strain raised soluble iron to 42 mg/kg in acidic soil without any added iron, boosted total nitrogen to 6.5 g/kg, improved phosphorus/potassium availability, and neutralized acidic soil pH while enriching beneficial nitrogen-fixing and siderophore-producing microbes.
chevron_right Technical Summary
A salt-and-alkali-loving soil bacterium found in a Chinese desert can help pepper plants thrive in both overly acidic and overly alkaline soil by unlocking iron and other nutrients the plants couldn't otherwise reach. It outperformed conventional iron fertilizers and boosted the overall health of the soil's microbial community.
Abstract Preview
Original paper
Salt/alkali‑tolerant Streptomyces luteus TRM 45540 improves pepper growth and soil quality in acidic and alkaline soils.
This study evaluated the potential of the salt-alkali-tolerant actinobacterium Streptomyces luteus TRM 45540, isolated from Lop Nur saline-alkali soil in Xinjiang, to alleviate pH-related iron defi...
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