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Molecular defense response of mycorrhizal bean plants infected with Rhizoctonia solani |
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| Authors: | Elsayed E. Hafez Gamal M. Abdel-Fattah Safwat A. El-Haddad Younes M. Rashad |
| Affiliation: | 1. City for Scientific Research and Technology Applications, Alexandria, Egypt 2. Botany Department, College of Science, Mansoura University, Mansoura, Egypt 5. Plant Production Department, College of Food and Agricultural Sciences, King Saud University, Riyadh, Saudi Arabia 3. Mycological Research and Disease Survey Department, Plant Pathology Institute, Agricultural Research Center, Giza, Egypt 4. Biology Department, Teachers College, King Saud University, Riyadh, Saudi Arabia |
| Abstract: | A time course study was conducted to investigate disease development and molecular defense response in common bean (Phaseolus vulgaris L.) plants colonized by a mixture of five arbuscular mycorrhizal (AM) fungi, namely, Glomus mosseae, G. intraradices, G. clarum, Gigaspora gigantea, and Gigaspora margarita, and post-infected with the soil-borne pathogen Rhizoctonia solani. Results showed that pre-colonization of bean plants by AM fungi significantly reduced disease severity and disease incidence. DNA fingerprinting using the differential display technique revealed a genetic polymorphism (86.8 %) in bean plants that resulted from the colonization by AM fungi. Two genetic mechanisms were recorded: (1) switching on of new genes and (2) induction of other active genes, including the defense genes chitinase and β-1,3-glucanase, to a highly expressed state. |
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