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Growth, Sporulation, and Germination of Spores of Thermophilic Fungi Incubated in Sun-Heated Soil

Michele A. Jack and Michael R. Tansey
Mycologia
Vol. 69, No. 1 (Jan. - Feb., 1977), pp. 109-117
DOI: 10.2307/3758624
Stable URL: http://www.jstor.org/stable/3758624
Page Count: 9
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Growth, Sporulation, and Germination of Spores of Thermophilic Fungi Incubated in Sun-Heated Soil
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Abstract

Rates of growth, sporulation, and spore germination were determined for thermophilic and thermotolerant fungi incubated in the field in sunheated soil and in shade, and in the laboratory at constant temperature. Continuous recordings of temperatures of sun-heated soils are presented. The thermophilic fungi Allescheria terrestris, Chaetomium thermophile var. dissitum, Dactylomyces thermophilus, Humicola lanuginosa, Malbranchea pulchella var. sulfurea, Mucor miehei, M. pusillus, Thielavia albomyces, T. heterothallica, Talaromyces emersonii, and Thermoascus aurantiacus, and the thermotolerant fungus Aspergillus fumigatus, grew when incubated in sun-heated temperate soil. All species which rapidly produced spores in the laboratory at 37 C also sporulated in sun-heated soil. Asexual spores of Mucor miehei, M. pusillus, Humicola lanuginosa, and Dactylomyces thermophilus germinated in sun-heated soil. It is concluded that the fluctuating temperature regime of sun-heated temperate soils provides sufficiently high temperatures of sufficient duration for most species of thermophilic and thermotolerant fungi to complete their life cycles; temperature per se is not limiting for growth, sporulation, and germination. For some species, direct sun-heating is not necessary for these processes; suitable temperatures occur in shaded temperate soils.

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