The feeding preference of mycophagous Collembola varies with the ectomycorrhizal symbiont |
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Authors: | F Hiol Hiol R K Dixon E A Curl |
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Institution: | (1) Department of Forestry, University of Dschang, Dschang, Cameroon;(2) Office of Research and Development, US Environment Protection Agency, 20460 Washington DC, USA;(3) Department of Plant Pathology and Microbiology, Auburn University, 36830 Auburn, AL, USA |
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Abstract: | The interactions of the collembolan insect Proisotoma minuta with ectomycorrhizal and/or pathogenic fungi was examined in three experiments: (1) in vitro analysis of feeding patterns, (2) in vitro food preference test, and (3) in situ analysis of ectomycorrhizal colonization in relation to population density. The ectomycorrhizal fungi Laccaria laccata, Pisolithus tinctorius, Suillus luteus, Thelephora terrestris and the pathogenic fungi Rhizoctonia solani were employed in all experiments. In vitro and in situ experiments revealed that Pr. minuta consumed all the ectomycorrhizal fungi tested but the feeding pattern and consumption varied with each isolate. In a comparative in vitro feeding preference test, where Pr. minuta was given a choice, R. solani was grazed more heavily than the ectomycorrhizal fungi. Among the ectomycorrhizal fungi examined, Pi. tinctorius was consumed significantly less than L. laccata, S. luteus or T. terrestris in the presence of R. solani. A 10-week in situ analysis of loblolly pine (Pinus taeda L.) seedling root systems inoculated with Pr. minuta revealed that ectomycorrhizal colonization was significantly less than that of control plants (without Pr. minuta). Collectively, these data suggest that mycophagous Collembola may play a major role in the distribution and biomass of ectomycorrhizal fungi in the rhizosphere of tree seedlings. |
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Keywords: | Laccaria laccata Pisolithus tinctorius Proisotoma minuta Rhizoctonia solani Suillus luteus Thelephora terrestris Collembolan insects |
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