Effect of Septoria leaf blotch and its control with commercial fungicides, on arbuscular-mycorrhizal-fungal colonization, spore numbers, and morphotype diversity
Autor: | Marta Noemí Cabello, Santiago Schalamuk, María Rosa Simón, Silvana Velázquez |
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Jazyk: | angličtina |
Rok vydání: | 2014 |
Předmět: |
biology
fungi Botánica Soil Science Plant Science biology.organism_classification Spore Otras Agricultura Silvicultura y Pesca Fungicide Septoria CIENCIAS AGRÍCOLAS Botany Wheat purl.org/becyt/ford/4.1 [https] Fungal colonization Mycosphaerella graminicola Strobilurin Triazole Agricultura Silvicultura y Pesca Arbuscular mycorrhizal Glomeromycota Agronomy and Crop Science purl.org/becyt/ford/4 [https] |
Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET SEDICI (UNLP) Universidad Nacional de La Plata instacron:UNLP |
Popis: | Arbuscular-mycorrhizal internal structures (i.e. total root colonization, arbuscules, vesicles) and external structures (i.e. spore density), and Glomeromycota spore morphotypes, were evaluated in wheat severely infected with Mycosphaerella graminicola-the causal agent of Septoria leaf blotch. Plots in which the infection was controlled with a commercial fungicide at recommended field doses, were also examined. The commercial fungicide used was an admixture of trifloxistrobin and tebuconazole. No negative effects of the fungicide application on arbuscular-mycorrhizal fungi (AMF) were found. The M. graminicola fungicidal treatment actually favoured the formation of arbuscules and AMF spores, as there was a selective increase in the density of spores belonging to the glomoid morphotype. Arbuscular-mycorrhizal fungi have an absolute dependence on the carbon provided by the plant. A severe foliar disease leading to a diminished carbon supply to the roots would generate decreases in carbon availability. Such decreases would strongly affect mycorrhizal associations and development. Furthermore, the change in the green-leaf area produced by a severe foliar disease and/or a reversal of that condition through fungicide treatment could result in shifts in the composition of the AMF community so as to favour glomoid morphotypes. Glomoid species have been previously considered as r-strategists. Facultad de Ciencias Agrarias y Forestales Centro de Química Inorgánica Instituto de Botánica "Dr. Carlos Spegazzini" |
Databáze: | OpenAIRE |
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