Soil nutrient levels are associated with suppression of banana Fusarium wilt disease
image: Soil nutrient levels are associated with suppression of banana Fusarium wilt disease. In this image, the forest plots and heatmap illustrate chemical properties of soils suppressive or conducive to Fusarium wilt (a). The violin plot illustrates the abundance levels of microbial functional genes related to disease suppression (b). The heatmap presenting the abundance levels of microbial functional genes related to soil nutrient cycling (c). Phosphorus improvement lead to enhanced soil suppressiveness to banana Fusarium wilt disease, especially in the rhizosphere, and this may be related to nutrient related genes.
Credit: Yifan Cao, Yannan Ou, Nana Lv, Chengyuan Tao, Hongjun Liu, Rong Li, Zongzhuan Shen, Qirong Shen
Fusarium wilt poses a significant threat to global agriculture, particularly affecting the banana industry, where it is commonly known as banana Panama disease. As a result, enhancing soil-related resistance has emerged as a crucial, environmentally friendly disease management strategy, reducing the need for chemical interventions. But what factors influence soil disease suppressiveness? A recent study, published in Soil Ecology Letters, has uncovered a pivotal connection between soil nutrient status and disease suppression.
Researchers have discovered that an increase in soil available phosphorus, followed by elevations in soil nitrogen and carbon, is pivotal in suppressing the disease. This conclusion was drawn from a comparison of orchards located in pairs, where one orchard was conducive to Fusarium wilt and the other suppressive. To delve deeper into the soil microbiome and its role in this process, the study employed amplicon and metagenomic sequencing techniques. A notable enhancement in the disease-suppressing functions of the soil microbiome was detected in the rhizosphere of suppressive sites. And this enhancement was strongly associated with particular nutrient-linked functions, indicating a symbiotic relationship in maintaining soil nutrient levels and suppressing pathogens. Among the microorganisms identified to be influenced by soil nutrients and aiding in disease suppression, Blastocatella and Bacillus stood out, which are known to produce antimicrobial compounds that shield plants from pathogenic infections.
Dr. Shen commented, "Hainan Island holds significant importance in China's banana industry. Fortunately, we came across orchards located in pairs that exhibited contrasting characteristics towards Fusarium wilt. This natural and gradual formation of traits made it an exemplary case study for our research."
This research underscores the significance of soil nutrient management and microbiome manipulation as effective means to combat soil-borne diseases. By maintaining soil health through balanced nutrition and fostering a diverse, beneficial soil microbiome, farmers can potentially decrease their reliance on chemical pesticides. This promotes agricultural practices that are more sustainable and environmentally friendly.