Mycorrhiza Regulates Signal Substance Levels and Pathogen Defense Gene Expression to Resist Citrus Canker

  • Miao-Miao XIE Yangtze University, College of Horticulture and Gardening, Jingzhou, Hubei 434025
  • Yi-Can ZHANG Yangtze University, College of Horticulture and Gardening, Jingzhou, Hubei 434025
  • Li-Ping LIU Yangtze University, College of Horticulture and Gardening, Jingzhou, Hubei 434025
  • Ying-Ning ZOU Yangtze University, College of Horticulture and Gardening, Jingzhou, Hubei 434025
  • Qiang-Sheng WU Yangtze University, College of Horticulture and Gardening, Jingzhou, Hubei 434025; University of Hradec Kralove, Faculty of Science, Department of Chemistry, Hradec Kralove 50003
  • Kamil KUČA University of Hradec Kralove, Faculty of Science, Department of Chemistry, Hradec Kralove 50003
Keywords: arbuscular mycorrhizal fungi; canker; pathogenesis related gene; salicylic acid


Citrus canker is a quarantined disease, severely harming citrus plants. Soil beneficial arbuscular mycorrhizal fungi (AMF) can provide a biological control pathway to resist pathogens. This work was to test changes of signal substances including hydrogen peroxide (H2O2), nitric oxide (NO), calmodulin (CaM), salicylic acid (SA) and jasmonic acid (JA) and the pathogen defense gene expression in roots of AMF (Paraglomus occultum) and non-AMF trifoliate orange (Poncirus trifoliata) seedlings after infected by a expressions citrus canker pathogen (Xanthomonas axonopodis pv. Citri, Xac). AMF inoculation significantly improved plant height, stem diameter and leaf number. Xac infection dramatically decreased root H2O2, NO, and SA levels, but increased root CaM and JA concentrations in non-AMF seedlings. There were higher H2O2 and CaM levels and lower JA levels in Xac-infected seedlings than in non-Xac-infected seedlings under mycorrhization. Under non-Xac infection, mycorrhizal treatment reduced root H2O2, NO, and SA but increased CaM and JA levels. However, under Xac infection, mycorrhizal inoculation distinctly accelerated root H2O2, NO, CaM, and SA accumulation, accompanied with up-regulated expression levels of root PtEPS1 (enhance pseudomonas susceptibility 1) and PtPR4 (pathogenesis related gene 4), indicating that Xac stimulated mycorrhizal roles in enhancing resistance of citrus canker. Such results imply that citrus plants with pre-inoculated AMF had stronger resistance to Xac infection through increasing signal substrate accumulation and pathogen defense gene expressions.



In press - Online First. Article has been peer reviewed, accepted for publication and published online without pagination. It will receive pagination when the issue will be ready for publishing as a complete number (Volume 47, Issue 4, 2019). The article is searchable and citable by Digital Object Identifier (DOI). DOI link will become active after the article will be included in the complete issue.



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How to Cite
XIE, M.-M., ZHANG, Y.-C., LIU, L.-P., ZOU, Y.-N., WU, Q.-S., & KUČA, K. (2019). Mycorrhiza Regulates Signal Substance Levels and Pathogen Defense Gene Expression to Resist Citrus Canker. Notulae Botanicae Horti Agrobotanici Cluj-Napoca, 47(4).
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