| Autor: |
Dalio RJD; Departament of Plant Pathology and Nematology, University of São Paulo (USP/Esalq), Piracicaba 13400-900, Brazil., Maximo HJ; Departament of Plant Pathology and Nematology, University of São Paulo (USP/Esalq), Piracicaba 13400-900, Brazil., Roma-Almeida R; Departament of Plant Pathology and Nematology, University of São Paulo (USP/Esalq), Piracicaba 13400-900, Brazil., Barretta JN; Departament of Plant Pathology and Nematology, University of São Paulo (USP/Esalq), Piracicaba 13400-900, Brazil., José EM; STK Bio-Ag Technologies Ltd., Petah Tikva 4922297, Israel., Vitti AJ; STK Bio-Ag Technologies Ltd., Petah Tikva 4922297, Israel., Blachinsky D; STK Bio-Ag Technologies Ltd., Petah Tikva 4922297, Israel., Reuveni M; STK Bio-Ag Technologies Ltd., Petah Tikva 4922297, Israel.; Shamir Research Institute, University of Haifa, Katzrin 12900, Israel., Pascholati SF; Departament of Plant Pathology and Nematology, University of São Paulo (USP/Esalq), Piracicaba 13400-900, Brazil. |
| Abstrakt: |
The essential tea tree oil (TTO) derived from Melaleuca alternifolia plant is widely used as a biopesticide to protect crops from several plant-pathogens. Its activity raised queries regarding its ability to, not only act as a bio-fungicide or bio-bactericide, but also systemically inducing resistance in plants. This was examined by TTO application to banana plants challenged by Fusarium oxysporum f. sp. cubense (Foc, Race 1) causing Fusarium wilt and to tomato plants challenged by Xanthomonas campestris . Parameters to assess resistance induction included: disease development, enzymatic activity, defense genes expression correlated to systemic acquired resistance (SAR) and induced systemic resistance (ISR) and priming effect. Spraying TTO on field-grown banana plants infected with Foc and greenhouse tomato plants infected with Xanthomonas campestris led to resistance induction in both hosts. Several marker genes of salicylic acid, jasmonic acid and ethylene pathways were significantly up-regulated in parallel with symptoms reduction. For tomato plants, we have also recorded a priming effect following TTO treatment. In addition to fungicidal and bactericidal effect, TTO can be applied in more sustainable strategies to control diseases by enhancing the plants ability to defend themselves against pathogens and ultimately diminish chemical pesticides applications. |
