Biocontrol traits of plant growth suppressive arbuscular mycorrhizal fungi against root rot in tomato caused by Pythium aphanidermatum
Por:
Larsen J., Graham J.H., Cubero J., Ravnskov S.
Publicada:
1 jun 2012
Resumen:
Arbuscular mycorrhizal (AM) fungi known to cause plant growth depressions in tomato were examined for their biocontrol effects against root rot caused by Pythium aphanidermatum. The main hypothesis was that plant growth suppressive AM fungi would elicit a defence response in the host plant reducing Pythium root rot development. To test this hypothesis a fully factorial experiment was performed with AM fungi (Glomus intraradices, G. mosseae, G. claroideum or nonmycorrhizal), Pythium (+/- P. aphanidermatum) and harvest (7 and 14 days after pathogen inoculation (dapi)) as the main factors. Two weeks after AM fungi inoculation, roots were challenged with P. aphanidermatum. Variables evaluated at each harvest were root colonization levels of the interacting fungi, plant growth responses, and expression of a plant pathogenesis related protein gene (PR-1). All of the tested AM fungi caused marked growth suppressions, but did not affect PR-1 gene expression or the phosphorous concentration in
Filiaciones:
Larsen J.:
Faculty of Agricultural Science, Department of Integrated Pest Management, University of Aarhus, DK-4200 Slagelse, Denmark
Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de México, Apartado Postal 27-3, Santa Maria de Guido, C. P. 58090, Morelia, Michoacán, Mexico
Graham J.H.:
Faculty of Agricultural Science, Department of Integrated Pest Management, University of Aarhus, DK-4200 Slagelse, Denmark
Citrus Research and Education Center, University of Florida, Lake Alfred, FL 33850, United States
Cubero J.:
Citrus Research and Education Center, University of Florida, Lake Alfred, FL 33850, United States
Depto. Proteccion Vegtal, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), 28040 Madrid, Spain
Ravnskov S.:
Faculty of Agricultural Science, Department of Integrated Pest Management, University of Aarhus, DK-4200 Slagelse, Denmark
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