BioControl

, Volume 51, Issue 2, pp 229–243 | Cite as

The Ability of Plant Compost Leachates to Control Black Mold (Aspergillus niger) and to Induce the Accumulation of Antifungal Compounds in Onion Following Seed Treatment

Article

Abstract

Onion seeds treated with leachates of composts prepared from alfalfa and sunflower stalks, at the dosages of 10% and 20% respectively, were inoculated with Aspergillus niger van Tieghem, causal agent of onion black mold disease. The ability of the leachates to induce the production of antifungal compounds and to control black mold were tested at seedling and set stages. Leachates from both composts were able to reduce disease incidence in sets, but not disease severity in onion seedlings. Extracts from treated seedlings and sets were fractionated by thin layer chromatography for their content of antifungal compounds. There were no significant differences between the fractions of alfalfa and sunflower compost leachates in the inhibition of the mycelium growth of A. niger, with the exception of one fraction. The presence of fluorescent pseudomonads and Pantoae agglomerans [synonym: Erwinia herbicola (Löhnis)] bacteria was determined in both leachates. The population of P. agglomerans was higher in the sunflower compost leachate compared to the alfalfa leachate. The tested strains of both bacteria were able to inhibit mycelium growth of the fungal pathogen in agar tests. This study suggests the possible role of beneficial bacteria in the induction of antifungal compounds in onion against A. niger during seedling and set stages.

Keywords

antifungal compounds black mold (Aspergillus nigercompost leachate onion (Allium cepa L.) 

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Copyright information

© Springer 2006

Authors and Affiliations

  1. 1.Department of Plant Protection, Faculty of AgricultureTrakya UniversityTekirdağTurkey

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