Effect of temperature, osmotic potential and pH on the growth of the turf pathogens Gaeumannomyces wongoonoo and Magnaporthe griffinii

Author(s)
Evans, B J
Wong, P T W
Martin, P M
Publication Date
2016-10-08
Abstract
<p>The effects of temperature, osmotic potential and pH on the linear growth rates of two isolates of <i>Gaeumannomyces wongoonoo</i> and three isolates of <i>Magnaporthe griffinii</i> were studied. <i>G. wongoonoo</i> and <i>M. griffinii</i> grew maximally at 20-25°C and 25-30°C, respectively, which may explain their disease activity in the field from late spring to mid-autumn. The growth rate of <i>G. wongoonoo</i> was more than halved at about 15°C, and growth ceased at 10°C. Growth of <i>M. griffinii</i> was negligible at 15°C and ceased at 10°C. There was negligible growth of both fungi at 35°C. In response to osmotic potential, <i>G. wongoonoo</i> grew maximally at an osmotic potential of -0.12 MPa, while <i>M. griffinii</i> grew fastest at -1.0 to -2.0 MPa depending on the isolate. The growth rates of both fungi decreased linearly as the osmotic potential decreased, that of <i>G. wongoonoo</i> and one isolate of <i>M. griffinii</i> being minimal at -5.0 MPa, while the other two isolates of <i>M. griffinii</i> were capable of growth at -6.0 MPa, albeit very slowly. In response to pH, <i>G. wongoonoo</i> grew maximally at a pH 6.5-7.0, and the growth rate was halved at pH 5.0. In contrast, all three isolates of <i>M. griffinii</i> grew maximally at pH 5.0 and their growth rates were more than halved in the alkaline range (pH 7.0-8.0). These in vitro results provide a basis for more research into the activity of these fungal pathogens in field situations.</p>
Citation
Acta Horticulturae, v.1122, p. 49-54
ISBN
9789462611269
ISSN
2406-6168
0567-7572
Link
Publisher
International Society for Horticultural Science
Title
Effect of temperature, osmotic potential and pH on the growth of the turf pathogens Gaeumannomyces wongoonoo and Magnaporthe griffinii
Type of document
Conference Publication
Entity Type
Publication

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