期刊
HORTSCIENCE
卷 56, 期 9, 页码 1104-1111出版社
AMER SOC HORTICULTURAL SCIENCE
DOI: 10.21273/HORTSCI15945-21
关键词
apple replant disease; biotic stress response; reactive oxygen species; antioxidant enzyme activity; PR proteins
类别
资金
- National Natural Science Foundation of China [32072510]
- earmarked fund for National Modern Agro-industry Technology Research System of China [CARS-27]
- Qingchuang Science and Technology Support Project of Shandong Colleges and Universities [2019KJF 020]
- Natural Science Foundation Shandong Province [ZR2020MC131]
- Fruit Innovation Team in Shandong Province, China [SDAIT-06-07]
- [ts20190923]
The study found that in the early stage of infection, the apple root system remained normal with small brown areas, but experienced a rapid burst of ROS and increased activities of antioxidant enzymes and PR transcription. As the infection progressed, infected root tissues displayed dark brown necrosis, and activities of antioxidant enzymes and PR transcription decreased gradually after reaching their peak. Ultimately, the plant biomass decreased, leading to plant death.
Apple replant disease (ARD) causes enormous economic loss and threatens the survival of apple industry worldwide. Fusarium solani is one of the pathogens that has been proven to cause ARD. Samples were collected at different time periods to investigate the mechanism of defense responses of apple to F. solani infection by monitoring the biomass, reactive oxygen species (ROS), and antioxidant enzyme activities of the apple rootstock 'M.9T337'. In addition, the abundance of transcription of four pathogenesis-related (PR) proteins involved in antifungal defense was monitored. The results showed that the apple root system was normal and had small brown areas. However, there is a rapid burst of ROS during the early infection stage, and the activities of antioxidant enzymes and transcription of PRs increased during this period. With the extension in infection time, the infected root tissues displayed dark brown necrosis, and the activities of antioxidant enzymes and abundance of transcription of PRs decreased gradually after reaching their peak. Eventually, the plant biomass decreased, and the plant died. In conclusion, the levels of ROS and activities of antioxidant enzymes played an active role during the early stage of resistance of 'M.9T337' apples to infection by F. solani. Infection by F. solani can destroy the ROS scavenging system, causing oxidative damage and inhibiting the growth of apple rootstocks.
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