Impact of clear-cutting and prescribed burning on microbial diversity and community structure in a Jack pine (Pinus banksiana Lamb.) clear-cut using Biolog Gram-negative microplates |
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Authors: | Staddon WJ Duchesne LC Trevors JT |
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Institution: | (1) Department of Plant Pathology, Montana State University, 59717 Bozeman, MT, USA |
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Abstract: | Three isolates ofFusarium avenaceum are pathogenic on spotted knapweed(Centaurea maculosa), a major weed plant of pasturelands and rangelands of the Pacific Northwestern USA. One isolate (no. 1) obtained from the
European centre of origin of knapweed and isolate no. 365 native to Montana, did not significantly affect knapweed seed germination.
However,F. avenaceum no. 1003, another Montana native isolate, caused a 100% decrease in seed germination and hence, no seedling emergence. When
formulated, isolate no. 1003, could be recovered from treated soils after 7 days and caused a significant reduction in seedling
emergence or seedling dry weight. This organism had no effect on the germination ofTriticum aestivum orMedicago sativa, but did affect the germination of other plant species.F. avenaceum appears to be a candidate for the biocontrol of spotted knapweed, however, a native isolate is potentially more effective
than an isolate obtained from the centre of origin ofC. maculosa. |
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Keywords: | biocontrol Centaurea maculosa Fusarium avenaceum knapweed |
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