The study of calcium peroxide mitigating apple replant disease (ARD)

Le résumé fourni par la source

This study aims to investigate the efficacy of calcium peroxide (CaO₂) at varying concentrations in controlling apple replant disease (ARD) and elucidate its regulatory mechanisms on the soil microenvironment and the growth of M. hupehensis Rehd. seedlings. Through plate antibacterial tests, measurements of mycelial substance metabolism and antioxidant enzyme activity, as well as electron microscopy observations, we evaluated the inhibitory effect of calcium peroxide on F. proliferatum , the main pathogenic fungus causing ARD. Systematic analysis of relevant indicators of replant soil and replant seedlings was conducted using methods such as plate coating counting, fluorescence quantitative analysis, and high-throughput sequencing. The results demonstrate that CaO₂ treatment significantly inhibits the growth of F. proliferatum mycelium, reduces the abundance of harmful fungi such as Fusarium species in soil, and effectively degrades accumulated phenolic compounds. Additionally, CaO₂ treatment significantly enhanced the antioxidant capacity of M. hupehensis Rehd. seedlings, increased superoxide dismutase (SOD) and peroxidase (POD) activity, and promoted the accumulation of both shoot and root biomass. In summary, the appropriate application of calcium peroxide can effectively mitigate the occurrence of ARD, with its mechanism involving improvements in soil microecology and regulation of plant physiological metabolism. This study provides new theoretical support for the use of oxidizing agents to prevent and control fruit tree replant problems, and offers a feasible technical strategy for sustainable soil utilization and ecological restoration during the renewal process of old orchards.

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