The interplay between the formation of Chinese cordyceps and the characteristics of soil properties and microbial network

Summary

This research examined how soil properties and bacteria change during the growth of Chinese cordyceps, a valuable medicinal fungus found on the Qinghai-Tibet Plateau. Scientists discovered that the most critical stage occurs when the fungus infects and consumes the host larvae, during which soil becomes less acidic, loses nutrients, and experiences significant changes in bacterial communities. The findings show that specific bacteria like Pseudomonas and Dyella help the cordyceps grow by breaking down chitin from the larvae’s exoskeleton. Understanding these interactions can help improve artificial production of this expensive medicinal fungus.

Background

Chinese cordyceps (Ophiocordyceps sinensis) is a parasitic fungus endemic to the Qinghai-Tibet Plateau with significant medicinal and economic value. Understanding the interactions between soil properties and microbial communities is crucial for optimizing artificial cultivation, as few studies have explored dynamic changes in soil properties and microbial communities at different stages of cordyceps formation.

Objective

This study investigated changes in soil physicochemical properties, enzyme activities, and microbial diversity during the formation of Chinese cordyceps across different developmental stages, including sterilized soil, host larvae-rearing soil, mummified host larvae-rearing soil, and pellicle soil stages.

Results

The mummified host larvae-rearing stage exhibited the most pronounced fluctuations in soil parameters including pH, organic matter, phosphorus, and potassium levels. Microbial diversity peaked at this stage with highest bacterial richness and abundance of Dyella and Pseudomonas. Microbial network analysis revealed maximum complexity but lowest stability during the mummified stage, with enhanced chitinolytic function supporting cordyceps development.

Conclusion

Soil physicochemical properties, enzyme activities, and microbial communities undergo significant dynamic changes during cordyceps formation, with the mummified host larvae-rearing stage as the critical period. These findings provide foundational understanding for optimizing artificial cordyceps production and achieving higher yield and quality.
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