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Vol.44 >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10466/3312

Title: Influence of Temperature, Hydrogen-ion Concentration and Osmotic Potential on Oospore Germination of Pythium paddicum and P.iwayamai
Authors: GE, Lan-ping
Issue Date: 31-Mar-1992
Publisher: University of Osaka Prefecture
Citation: Bulletin of the University of Osaka Prefecture. Ser. B, Agriculture and biology. 1992, 44, p.7-11
Abstract: Two soil-borne fungi, P. paddicum and P. iwayamai, causing Pythium snow rot of wheat and barley, were compared for the behaviour of oospores under various cultural conditions. On Bacto-cornmeal agar (CMA) medium, optimum temperatures for oospore germination were approximately 20℃ for P. paddicum and 10-25℃ for P. iwayamai. On CMA adjusted to pH values between 4.8 and 8.2 with a MES [2-(N-morpholino) ethanesulfonic acid] buffer, both fungi germinated well. P. paddicum reached the best germination at pH 5.5, P. iwayamai at 6.5. On CMA amended with a non-ionic mannitol to adjust osmotic potential between -1.3 and -37.2 bars, oospores of P. paddicum were able to germinate only above -10.2 bars, but those of P. iwayamai germinated above -19.0 bars, with the highest germination rate between -3.4 and -19.0 bars. The relationship between the results obtained and the ecology of the two fungi is discussed.
URI: http://hdl.handle.net/10466/3312
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