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Growth and Ectomycorrhizal Development of Loblolly Pine Seedlings in Fumigated Soil Infested with the Fungal Symbiont Pisolithus tinctorius

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Vegetative mycelium in a vermiculite-peat moss-nutrient medium and basidiospores of Pisolithus tinctorius were used to infest fumigated soil and synthesize ectomycorrhizae on over 4000 Pinus taeda seedlings in 36 nursery microplots. Soil mulches provided four soil temperature regimes with diurnal fluctuations between 19°C and 47°C. In all regimes, mycelial inoculum of P. tinctorius completely colonized roots of loblolly pine seedlings during an 8 mo growth period, formed ectomycorrhizae on approximately 92 percent of short roots, and stimulated twice as much dry matter production as in seedlings ectomycorrhizal with naturally occurring fungi, including Thelephora terrestris. When basidiospores of P. tinctorius were added to soil around 2-mo-old seedlings already ectomycorrhizal with naturally occurring fungi, approximately half the ectomycorrhizae after 8 mo were formed by P. tinctorius. Basidiocarps of P. tinctorius were produced around certain microplots. The following year, P. tinctorius from overwintered inoculum in the microplots formed ectomycorrhizae on loblolly pine seedlings when soil was mixed at ratios as great as 1:10 with recently fumigated soil. Vegetative mycelial and basidiospore inocula of P. tinctorius can be used to artificially infest fumigated soil to tailor pine seedlings with this highly beneficial ectomycorrhizal association. Forest Sci. 21:245-254.
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Keywords: Cronartium fusiforme; Pinus taeda; foliar and soil chemical analyses; reforestation and afforestation practices

Document Type: Journal Article

Affiliations: Associate Plant Pathologist, USDA Forest Service, Southeastern Forest Experiment Station, Forestry Sciences Laboratory, Athens, Georgia 30602

Publication date: 1975-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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