Researchers reveal the mechanism of continuous cropping that leads to the decline of soil disease suppression function
By: Date: 2021-04-17 Categories: foodtechnology Tags: ,
   Recently, the Innovation Team of Soil Pest Prevention and Control of the Institute of Plant Protection of the Chinese Academy of Agricultural Sciences cooperated with the Netherlands Institute of Ecology and found that continuous cropping would lead to the decline of the disease inhibitory function of the bacteria colonizing the mycelium of the pathogenic fungus, which is the cucumber fusarium wilt under continuous cropping conditions. The cause of aggravation provides a new explanation and new ideas for the treatment of fusarium wilt. The relevant results were published online in”Applied Soil Ecology (Applied Soil Ecology)”.
  According to Associate Researcher Guo Rongjun, the soil ecosystem is complex, and the tiny area where fungal hyphae contacts the soil is the frontier position for soil bacteria to antagonize fungi. The bacterial community that colonizes the hyphae depends on their composition and function. The genus varies. At present, there is a lack of research on the colonizing bacteria around the hyphae of plant pathogenic fungi under different farming systems at home and abroad. To clarify the relationship between the population composition and function of the colonizing bacteria around the hyphae of cucumber Fusarium wilt and the farming system is a new perspective. It is of great significance to reveal the decline mechanism of soil disease suppression function under continuous cropping conditions, to dig out new biological control factors and to find new prevention and control strategies.
   The study investigated the effects of continuous cropping and non-continuous cropping, inoculation with Fusarium wilt, and long-term continuous cropping after inoculation with Fusarium wilt on the colonizing bacteria around the hyphae of Fusarium wilt through the establishment of artificial sickbeds and greenhouse pot experiments. Using the Illumina sequencing method, it was found that cucumber growth time and continuous cropping were the main factors affecting the changes in the composition and abundance of colonizing bacteria around the hyphae of Fusarium wilt. Furthermore, two bacterial combinations of Rhizobium bacteria and Achromobacter bacteria were designed, and the cultivable bacteria were used to test the anti-disease function of different bacterial combinations, and it was found that the abundance of Rhizobium bacteria decreased and the abundance of Achromobacter bacteria increased. As a result, the inhibitory effect of bacteria on fusarium wilt decreased. The study revealed that continuous cropping and the introduction of Fusarium wilt are important reasons for the decline of the bacterial community in the soil. It is found that the rhizobia can be used as a new biological control factor to play a role in disease prevention and provide a new idea for the prevention and control of cucumber fusarium wilt. .
   The research was funded by the China Scholarship Council Scholarship Fund, Modern Agricultural Industrial Technology System and other projects. (Correspondent Ouyang Canbin)
   link to the paper:https://doi.org/10.1016/j.apsoil.2021.103977
Researchers reveal the mechanism of continuous cropping that leads to the decline of soil disease suppression functionimage
   Differences in composition of Fusarium wilt mycelial bacteria in continuous cropping soil and non-continuous cropping soil
Researchers reveal the mechanism of continuous cropping that leads to the decline of soil disease suppression functionimage(1)< br/>
  The relative abundance of Fusarium wilt fungus hyphae bacteria in different treatments