Interaction between Alternaria alternata or Fusarium equiseti and Glomus mosseae and its effects on plant growth |
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Authors: | C B McAllister J M Garcia-Garrido I Garcia-Romera A Godeas J A Ocampo |
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Institution: | (1) Departamento de Microbiologia, Estacion Experimental del Zaidin, CSIC, Prof. Albareda 1, E-18008 Granada, Spain Tel.: (58) 121011; Fax: (58)129-600, ES;(2) Departamento Ciencias Biologicas, 40 II Pabellon, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina, AR |
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Abstract: | The effect of inoculation with the saprophytic fungi Alternaria alternata or Fusarium equiseti on maize (Zea mays) and lettuce (Lactuca sativa) with or without arbuscular mycorrhizal (AM) colonization by Glomus mosseae was studied in a greenhouse trial. Plant dry weights of non-AM-inoculated maize and lettuce were unaffected by the presence
of A. alternata and F. equiseti. In contrast, A. alternata and F. equiseti decreased plant dry weights and mycorrhization when inoculated to the rhizosphere before G. mosseae. The saprophytic fungi inoculated 2 weeks after G. mosseae did not affect the percentage of root length colonized by the AM endophyte, but did affect its metabolic activity assessed
as succinate dehydrogenase activity. Although F. equiseti inoculated at the same time as G. mosseae did not affect mycorrhization of maize roots, its effect on AM colonization of lettuce roots was similar to that with A. alternata. In the rhizosphere of both plants, the population of saprophytic fungi decreased significantly, but was not affected by the
presence of G. mosseae. Our results suggest that there may have been a direct effect of the saprophytic fungi on the mycorrhizal fungi in the extramatrical
phase of the latter, and when the AM fungus was established in the root the AM fungus was less affected by the saprophytic
fungi.
Received: 16 January 1996 |
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Keywords: | Alternaria alternata Arbuscular mycorrhizas Fusarium equiseti Glomus mosseae Lactuca sativa Lettuce Maize Saprophytic fungi Zea mays |
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