The suppressive effect of compost amendments on Fusarium oxysporum f.sp. radicis-cucumerinum in cucumber and Verticillium dahliae in eggplant |
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| Institution: | 1. Laboratory of Plant Pathology, Institute of Olive Tree, Subtropical Crops and Viticulture, Hellenic Agricultural Organization Demeter, Agrokipio, 73100, Chania, Crete, Greece;2. Laboratory of Solid Waste and Wastewater Management, School of Agricultural Technology, Technological Educational Institute of Crete, Stavromenos, 71004, Iraklio, Crete, Greece;3. Laboratory of Plant Pathology, School of Agricultural Technology, Technological Educational Institute of Crete, Stavromenos, 71004, Iraklio, Crete, Greece;4. Laboratory of Plant Pathology, Department of Viticulture, Vegetable Crops, Floriculture and Plant Protection, Hellenic Agricultural Organization Demeter, Iraklio, 71003 Crete, Greece;1. University of Helsinki, Department of Environmental Sciences, Niemenkatu 73, FI-15140 Lahti, Finland;2. Natural Resources Institute Finland (Luke), Green Technology, Antinniementie 1, FI-41330 Vihtavuori, Finland;3. Natural Resources Institute Finland (Luke), Natural Resources and Bioproduction, FI-31600 Jokioinen, Finland;4. Institute of Environmental Sciences, Kazan Federal University, 420008 Kazan, Russia;1. Laboratory of Mycopathology and Microbial Technology, Centre of Advanced Study in Botany, Banaras Hindu University, Varanasi, India;2. Department of Mycology & Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, India;1. Consiglio per la Ricerca in Agricoltura e l’Analisi dell’Economia Agraria, Centro di Ricerca Orticoltura e Florovivaismo, via Cavalleggeri 25, I-84098 Pontecagnano Faiano (SA), Italy;2. CERMANU-Centro Interdipartimentale di Ricerca sulla Risonanza Magnetica Nucleare per l’Ambiente, l’Agro-Alimentare ed i Nuovi Materiali, via Università 100, I-80055 Portici (NA), Italy;3. Dipartimento di Farmacia, Università degli Studi di Salerno, via Giovanni Paolo II 132, I-84084 Fisciano (SA), Italy;1. Chiang Mai University, Department of Entomology and Plant Pathology, Chiang Mai 50200, Thailand;2. NBD Research Co., Ltd., 91/2 Rathburana Rd., Lampang 52000, Thailand |
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| Abstract: | The suppressive effect of six different compost amendments (A, B, C, D, E and Z) against Fusarium oxysporum f.sp. radicis-cucumerinum (Forc) in cucumber and Verticillium dahliae in eggplant was tested. The evaluation of composts in each pathosystem was carried out by recording external symptoms, isolations and plant growth. The concentration of total phenols was determined in the root and stem tissues of eggplant as well as in pure composts and in potting mixtures (soil amended with 20% of compost) at the beginning and the end of eggplant – V. dahliae bioassays. It was shown that composts A, B, C and D were effective against Forc, and composts C, D, E and Z were effective against V. dahliae. The decreased symptom severity and V. dahliae isolation ratio in eggplant was associated with significantly lower accumulation of phenols in stem tissues; whereas the concentration of total phenols in stem tissues of V. dahliae-infested eggplants was significantly higher compared to the non infested. In addition, total phenols content in the pure V. dahliae-suppressive composts was significantly higher than in the non-suppressive ones. Moreover, total phenols content in soil substrate and in potting mixture A decreased, whereas in mixtures B, C, D, E and Z was significantly increased during the time of bioassays process. Interestingly, total phenols content in the V. dahliae-suppressive potting mixtures C, D, E and Z was 3.8-, 3.7-, 3.7- and 4.4-fold higher compared with the non-suppressive control (100% soil), at the end of bioassays process (68 days post inoculation). This is the first insight in the role of phenols in the suppressive effect of composts against soil-borne pathogens, in planta. |
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| Keywords: | Compost Phenols Soil-borne pathogens Suppressive effect |
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