Effects of Temperature on Sporulation, Conidial Germination, and Infection of Maize byPeronosclerospora sorghifrom Different Geographical Areas
- 1 January 1985
- journal article
- research article
- Published by Scientific Societies in Phytopathology®
- Vol. 75 (1) , 122-126
- https://doi.org/10.1094/phyto-75-122
Abstract
Five isolates of P. sorghi (2 from the USA, and 1 each from India, Brazil and Thailand) were compared for effects of dew-period temperature on sporulation, germination, germ-tube growth, and establishment of infection in maize. Responses of all isolates except that from Thailand were similar at each air temperature. The isolate from Thailand was more tolerant to high temperatures; it germinated optimally from 12.degree.-32.degree. C; the Indian, Texas and Brazilian isolates germinated optimally from 12.degree.-20.degree. C. All isolates sporulated optimally from 15.degree.-23.degree. C. The Thailand isolate was the only one that produced mature conidia at 26.degree. C. Each isolate following conidial inoculation caused high levels of systemic infection at temperatures from 15.degree.-32.degree. C, and moderate levels at temperatures as low as 10.degree. C during the dew period.Keywords
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