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Temperature and sporulation of aquatic hyphomycetes

Chauvet, Eric and Suberkropp, Keller Temperature and sporulation of aquatic hyphomycetes. (1998) Applied and Environmental Microbiology, 64 (4). 1522-1525. ISSN 0099-2240

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Official URL: http://aem.asm.org/content/64/4/1522.short


Temperature appears to be an important factor affecting the occurrence and distribution of aquatic hyphomycetes, the dominant leaf litter-decomposing fungi in streams. We compared conidium production by eight species of aquatic hyphomycetes grown on yellow poplar leaves in stream-simulating microcosms at three temperatures (15, 20, and 25 degrees C). The greatest conidium production occurred at 15 degrees C for one species, 20 degrees C for two species, and 25 degrees C for two species. Two species produced similar numbers of conidia at 20 and 25 degrees C, and one species produced similar numbers of conidia at all three temperatures. Linear growth rates were determined on malt extract agar. Six species had the same pattern of temperature responses for growth on malt extract agar as for sporulation on leaves, as shown by the positive correlations between the two parameters at the three temperatures. The species examined also exhibited differences in number of conidia produced from a similar amount of leaf material at a given temperature. These differences appeared to be due primarily to differences in individual conidium mass (determined by weighing conidia produced from cultures), as shown by the relationship of the type Y = k/X (r = 0.96), where Y is the number of conidia produced, X is the individual conidium mass in milligrams, and k is a constant empirically determined to be 2.11. This finding supports the hypothesis that aquatic hyphomycetes allocate similar amounts of their resources to reproduction but vary with respect how these resources are partitioned into reproductive units (conidia).

Item Type:Article
Additional Information:Thanks to American Society for Microbiology editor. The definitive version is available at http://aem.asm.org/content/64/4/1522.short
HAL Id:hal-00949684
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > University of Alabama (USA)
Laboratory name:
Deposited On:20 Feb 2014 08:57

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