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Close correlation between sugarcane ratoon decline and rhizosphere ecological factors
Xiaoming Wang1, Jinghuan Zhu1, Junjun Ma2
1Key Laboratory for the Green and Efficient Production Technology of Sugarcane, Guangxi Science & Technology Normal University, Laibin, China.
Scientific Reports
|November 15, 2024
Summary
Sugarcane ratoon decline is linked to changes in rhizosphere ecological factors. Older ratoons show poorer growth, potentially due to deteriorating soil nutrients and altered microbial communities, especially endophytic fungi.
Area of Science:
- Agricultural Science
- Soil Science
- Microbiology
Background:
- Rhizosphere ecological factors are vital for sugarcane ratoon health and soil feedback.
- Systematic studies on these dynamics, particularly concerning sugarcane ratoon decline, are limited.
Purpose of the Study:
- To investigate the relationship between sugarcane ratoon decline and key rhizosphere ecological factors.
- To understand how soil properties and microbial communities change with sugarcane ratoon age and impact growth.
Main Methods:
- Comparative analysis of soil ecological factors (potassium, nitrogen fixation, peroxidase activity) and microbial community structure (rhizosphere and endophytic) across different sugarcane ratoon ages.
- Statistical analyses including correlation, intergroup disparity tests, and generalized additive models.
- Jaccard distance analysis for endophytic microbial community structure.
Main Results:
- First-year ratoons showed significantly better growth correlated with higher soil available potassium, nitrogen fixation, and peroxidase activity compared to third-year ratoons.
- Distinct differences in rhizosphere and endophytic microbial community structures were observed based on ratoon age.
- Positive correlations were found between sugarcane growth and alpha diversity of rhizosphere/endophytic bacteria, while endophytic fungi diversity showed a negative correlation.
Conclusions:
- Deterioration of non-microbial rhizosphere factors with increasing ratoon age contributes to sugarcane ratoon decline.
- The fungal community significantly impacts soil enzyme activity, and microbial communities indirectly influence yield via soil enzymes.
- Endophytic fungi, particularly Ascomycota, may play a critical role in sugarcane diseases and ratoon health.
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