Induction of Resistance and Defense Mechanisms of Geranium Plants Against Root Rot Disease Using Gallic Acid and 3,5-dinitrobenzoic Acid. | ||||
| Egyptian Journal of Phytopathology | ||||
| Volume 52, Issue 1, June 2024, Page 109-150 PDF (2.01 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejp.2024.362774 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Doaa Abd EL Samie Imara   1; Mohamed Saad El-Mohammady2; Shaimaa Ahmed Hanafy2; Rania Saber Yousef 3
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| 1Ornamental, Medicinal and Aromatic Plant Diseases Res. Dept., Plant Pathology Research Institute, A R C, Giza, Egypt. | ||||
| 2Plant Physiology Department, Faculty of Agriculture, Cairo University, Giza Egypt. | ||||
| 3Biochemistry Department, Faculty of Agriculture, Cairo University, Giza, Egypt. | ||||
| Abstract | ||||
| Root rot is a serious disease, causing considerable losses in essential oil production every year. In addition, the time of planting has a substantial impact on the severity and rate of disease development, combining the best strategies for applying exogenous polyphenolic compounds, plays a critical role in lowering disease-induced oxidative stress. This study focused on the role of gallic acid (GA) and 3,5-dinitrobenzoic acid (3,5-DNBNZA) acid in regulating resistance against geranium root rot pathogens i.e., Fusarium semitectum, Macrophomina phaseolina, Rhizoctonia solani, and Pythium irregulare via a multifunctional defense system. GA (600 mgL-1) and 3, 5-DNBZA (300 mgL-1) showed optimal antifungal activity by affecting the pathogen’s cell wall integrity and capacity to produce oxidative enzymes at various levels in vitro. The pathogens' mixture has a synergistic action since the infection percentages significantly increased than each pathogen alone in the pathogenicity test. The quadratic regression analysis confirmed that disease incidence (%) was gradually increased from winter to summer season. The dual application approach of GA and 3, 5-DNBZA was superior to the single application method for protection against root rot incidence and disease severity, coinciding with delaying the symptoms, improving the plant biomass and oil yield. Along with their favourable effects on biochemical traits, defense phenolics, enzymatic activities, and reduced leaf senescence. The present study recommended the dual application of GA and 3, 5-DNBZA as a sustainable and safe alternative management strategy for root rot disease and enhanced oil production. Also, elucidate the physiological and biochemical mechanisms behind their protective role. | ||||
| Keywords | ||||
| Induced resistance; Pelargonium graveolens; soil-borne phytopathogens; antioxidant enzymes; biotic stress | ||||
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