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Web URL(s): | http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PHYTO.2000.90.4.354 Last checked: 08/25/2010 Requires: PDF Reader |
Publication Type:
| Refereed |
Author(s): | Snider, Christopher S.;
Hsiang, Tom;
Zhao, Guiying;
Griffith, Marilyn |
Author Affiliation: | Snider and Griffith: Department of Biology, University of Waterloo, Hsiang and Zhao: Department of Environmental Biology, University of Guelph |
Title: | Role of ice nucleation and antifreeze activities in pathogenesis and growth of snow molds |
Section: | Ecology and population biology Other records with the "Ecology and population biology" Section
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Source: | Phytopathology. Vol. 90, No. 4, April 2000, p. 354-361. |
Publishing Information: | St. Paul, MN: American Phytopathological Society |
# of Pages: | 8 |
Keywords: | TIC Keywords: Pathogens; Ice; Snow; Snow molds; Threshold values; Cold resistance; Growth rate; Growth habit; Freezing; Proteins; Typhula; Coprinus psychromorbidus; Microdochium nivale; Typhula phacorrhiza; Typhula ishikariensis; Typhula incarnata; Myriosclerotinia borealis; Sclerotinia homoeocarpa; Growth; Temperatures; Ice nucleation
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Abstract/Contents: | "We examined the ability of snow molds to grow at temperatures from -5 to 30°C and to influence the growth of ice through assays for ice nucleation and antifreeze activities. Isolates of Coprinus psychromorbidus (low temperature basidiomycete variant), Microdochium nivale, Typhula phacorrhiza, T. ishikariensis, T. incarnata, and T. canadensis all grew at -5°C, whereas Sclerotinia borealis and S. homoeocarpa did not grow at temperatures below 4°C. The highest threshold ice nucleation temperature was -7°C. Because snow molds are most damaging to their hosts at temperatures above this, our results imply that the pathogenesis of these fungi is not dependent on ice nucleation to cause freeze-wounding of host plants. All snow molds that grew at subzero temperatures also exhibited antifreeze activity in the growth medium and in the soluble and insoluble hyphal fractions, with exception of M. nivale and one isolate of T. canadesis. The lack of high ice nucleation activity combined with the presence of antifreeze activity in all fungal fractions indicates that snow molds can moderate their environment to inhibit or modify intra- and extracellular ice formation, which helps explain their ability to grow at subzero temperatures under snow cover." |
Language: | English |
References: | 38 |
Note: | Pictures, b/w Tables Graphs |
| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete): Snider, C. S., T. Hsiang, G. Zhao, and M. Griffith. 2000. Role of ice nucleation and antifreeze activities in pathogenesis and growth of snow molds. Phytopathology. 90(4):p. 354-361. |
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| Web URL(s): http://apsjournals.apsnet.org/doi/pdfplus/10.1094/PHYTO.2000.90.4.354 Last checked: 08/25/2010 Requires: PDF Reader |
| MSU catalog number: SB 599 .P48 |
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