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Growth and Ectomycorrhizal Development of Loblolly Pine Seedlings in Fumigated and Nonfumigated Nursery Soil Infested with Different Fungal Symbionts

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Vegetative mycelial inoculum (mycelium) of Pisolithus tinctorius, Thelephora terrestris, and Cenococcum graniforme, and three quantities of basidiospores (spores) of P. tinctorius were used to infest fumigated and nonfumigated soil in an Oklahoma nursery to ascertain their significance in correcting an earlier deficiency of ectomycorrhizae on seedlings of Pinus taeda. All treatments in fumigated soil induced earlier ectomycorrhizal development on P. taeda seedlings than found on controls, and they produced a significant increase in the number (75 to 155 percent) and total fresh weights (24 to 125 percent) of plantable seedlings. Seedlings in nonfumigated control plots also formed ectomycorrhizae earlier than those in fumigated control plots, increasing the number of plantable seedlings by 129 percent and their weight by 59 percent. Mycelium of P. tinctorius and T. terrestris were the only treatments to increase the number of plantable seedlings in nonfumigated plots; no treatment in nonfumigated soil increased seedling weights. Inocula of all fungi were more effective in forming ectomycorrhizae in fumigated than in nonfumigated soil. C. graniforme was the least effective in forming ectomycorrhizae and stimulating seedling growth. Mycelium of P. tinctorius formed nearly twice as many ectomycorrhizae as did spores; quantity of spores did not influence the amount of P. tinctorius ectomycorrhizae. These findings are discussed in regard to their implications for growing pine seedlings in nurseries. Forest Sci. 24:193-203.

Keywords: Cenococcum graniforme; Pinus taeda; Pisolithus tinctorius; Reforestation; Thelephora terrestris; pine seeding quality

Document Type: Journal Article

Affiliations: Regeneration Specialist, Weyerhaeuser Company, Hot Springs, Arkansas 71901

Publication date: June 1, 1978

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