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    Author(s): Lynette PotvinR. Kasten Dumroese; Martin F. Jurgensen; Dana Richter
    Date: 2010
    Source: In: Riley, L. E.; Pinto, J. R.; Dumroese, R. K., tech. cords. National Proceedings: Forest and Conservation Nursery Associations-2009. Proc. RMRS-P-62. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 84-87.
    Publication Series: Proceedings (P)
    Station: Rocky Mountain Research Station
    PDF: View PDF  (218.92 KB)

    Description

    Mosaic, or patchy, stunting of bareroot conifer seedlings is thought to be caused by deficiencies of mycorrhizal fungi following fumigation, resulting in reduced nutrient uptake, particularly phosphorus. Mosaic stunting of jack pine (Pinus banksiana) seedlings was observed in 2005 at the USDA Forest Service JW Toumey Nursery in Watersmeet, MI. We initiated a study to determine if either the species of mycorrhizal fungi or the quantity of mycorrhizae were different on stunted and healthy seedlings. In 2006 and 2007, we tested the soil, sampled root tips, and analyzed seedling growth and foliar nutrient concentrations. In 2006, we used DNA sequencing to identify mycorrhizal fungi. Our results showed four main fungal taxa (Sistotrema brinkmannii, Thelephora terrestris, Suillus luteus, and Laccaria spp.) were associated with mycorrhizal root tips on stunted and healthy seedlings, and that the number of mycorrhizal root tips was high on both types of seedlings, although we observed variation among stocktypes and years. Despite soils having similar nutrient concentrations, we observed differences in foliar concentrations between stunted and healthy seedlings. Only 1+0 seedlings in 2007, however, showed significant differences. This suggests that reduced root nutrient uptake was a factor in stunting of 1+0 seedlings in 2007, but does not appear to be related to ectomycorrhizal fungi.

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    Citation

    Potvin, Lynette; Dumroese, R. Kasten; Jurgensen, Martin F.; Richter, Dana. 2010. Mosaic Stunting in jack pine seedlings in a northern Michigan bareroot nursery. In: Riley, L. E.; Pinto, J. R.; Dumroese, R. K., tech. cords. National Proceedings: Forest and Conservation Nursery Associations-2009. Proc. RMRS-P-62. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. p. 84-87.

    Keywords

    ectomycorrhizal fungi, foliar nutrients, bareroot, sawdust, organic matter, Sistotrema brinkmannii, Thelephora terrestris, Suillus luteus, Laccaria spp.

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