Abstract
Root exudates of wheat, sorghum and maize reduced growth ofRhizoctonia solani andFusarium oxysporum f. sp.cepae and increased growth ofBacillus subtilis in vitro. Analysis of these exudates showed that they were variable in their composition of sugars and amino acids. Growth of the tested microorganisms increased as the glucose content of the medium increased up to 3% for the bacterium and 4–5% for fungi. They also increased in growth as the concentration of certain amino acids increased.
The role of such substances in favouring attacks of these fungi to tomato or onion plants is discussed.
Zusammenfassung
Die Wurzelexsudate von Weizen, Sorghum und Mais reduzierten das Wachstum der PilzeRhizoctonia solani (Tomaten-Umfallkrankheit) undFusarium oxysporum f. sp.cepae (Zwiebelwelke), förderten dagegen die Vermehrung des auf diese Pilze antagonistisch wirkendenBacillus subtilis. Die chemische Analyse zeigte erhebliche Unterschiede zwischen den Exsudaten der drei Pflanzenarten bezüglich Art und Menge von Zukkern und Aminosäuren. Das Wachstum der drei Mikroorganismen wurde in unterschiedlicher Weise durch Glukose sowie die Aminosäuren Phenylalanin, Serin und Glutaminsäure beeinflußt. Die Rolle der Wurzelexsudate bei der Ausbreitung der Tomaten-Umfallkrankheit und der Zwiebelwelke wird erörtert.
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Mohamed, M.S., Sellam, M.A., Abd-Elrazik, A. et al. Zur Bedeutung von Wurzelausscheidungen verschiedener Kulturpflanzen für das Auftreten der Tomaten-Umfallkrankheit und der Zwiebelwelke. Anz. Schadlingskde., Pflanzenschutz, Umweltschutz 56, 10–14 (1983). https://doi.org/10.1007/BF01903255
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DOI: https://doi.org/10.1007/BF01903255