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Arbuscular mycorrhiza and environmentally biochemicals enhance the nutritional status of Helianthus tuberosus and induce its resistance against Sclerotium rolfsii.

  • Eid, Khaled E1
  • Abbas, Mohamed H H2
  • Mekawi, Enas M3
  • ElNagar, Mahran M4
  • Abdelhafez, Ahmed A5
  • Amin, Basma H6
  • Mohamed, Ibrahim7
  • Ali, Maha M8
  • 1 Benha University, Faculty of Agriculture, Plant Pathology Department, Egypt. Electronic address: [email protected] , (Egypt)
  • 2 Benha University, Faculty of Agriculture, Soils and Water Department, Egypt. Electronic address: [email protected] , (Egypt)
  • 3 Benha University, Faculty of Agriculture, Agricultural Biochemistry Department, Egypt. , (Egypt)
  • 4 Benha University, Faculty of Agriculture, Horticulture Department, Egypt. , (Egypt)
  • 5 Eco-environmental Protection Research Institute, Shanghai Academy of Agricultural Science (SAAS) , China; The New Valley University, Faculty of Agriculture, Soils and Water Department, Egypt. , (China)
  • 6 Al- Azhar University, The Regional Centre for Mycology and Biotechnology (RCMB) , Egypt. , (Egypt)
  • 7 Benha University, Faculty of Agriculture, Soils and Water Department, Egypt. Electronic address: [email protected] , (Egypt)
  • 8 Benha University, Faculty of Agriculture, Soils and Water Department, Egypt. , (Egypt)
Published Article
Ecotoxicology and Environmental Safety
Publication Date
Dec 30, 2019
DOI: 10.1016/j.ecoenv.2019.109783
PMID: 31629192


Chemical fungicides are effective tools in controlling plant pathogens; however, these chemicals can, on the other hand, distress the ecosystem. Accordingly, the current research investigates the potentiality of substituting traditional chemical fungicides by inducing plant resistance against infection with soil-born pathogens i.e. Sclerotium rolfsii in the presence of mycorrhizae (AMF) as plant inoculants and one of the following amendments: humic acid, sulphex (a mixture of canola oil and diluted sulphuric acid) and paclobutrazol (ABZ). To attain the abovementioned objective, a field (mildly infected with S. rolfsii) was cultivated with Helianthus tuberosus (a perennial plant belongs to the Asteraceae family) for two successive seasons (2014 and 2015) and the above-mentioned treatments were tested for their feasibilities in controlling S. rolfsii infection against the chemical fungicide "Vitavax-200" either solely or in combinations in a complete randomized block design. Inoculating plants with AMF or amending soils with either humic acid, Sulphex or ABZ solely increased significantly the activities of plant defense enzymes by approximately 1.5-2.1 folds higher than the control treatment. These treatments also improved NPK availability in soil and; hence, increased their contents within plant tubers. Consequently, these treatments decreased the disease incidence and severity caused by S. rolfsii while improved shoot biomass and tuber yield. In spite of that, these results stood below the prospective of the fungicide treatment. The integrated treatments i.e. "humic acid + AMF", "Sulphex + AMF" and "ABZ + AMF" caused further significant improvements in both NPK availabilities in soil and plant areal bio-masses. This probably induced further plant resistance against the investigated soil-borne pathogen while recorded insignificant variations in disease incidence and severity when compared with the fungicide treatment. Moreover, the integrated treatments increased the tuber yields beyond those attained for the fungicide treatment. Accordingly, such integrated strategies can completely substitute the chemical fungicides; thus, minimize their negative impacts on the ecosystem. Copyright © 2019 Elsevier Inc. All rights reserved.

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