Environment and Sporulation in Phytopathogenic Fungi Li. Conidia Formation in Peronospora Tabacina Adam as a Function of Temperature

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Abstract
Using a leaf-disk technique, an analysis was carried out to study the effect of environmental temperature on the length of the incubation period and sporulation intensity of P. tabacina. An analysis was also made of the sporulation response to temperature treatments prior to and during sporulation. Infected tobacco leaf is potentially capable of some sporulation from the 4th to the 17th day after infection. Maximum sporulation occurs 7-8 days after infection. Sporulation of P. tabacina is characterized by an optimal temperature range of 15-23C, a minimum of 1-2CC, and maximum of 30[degree]C. The shape of the response curve is a characteristic of the fungus and independent of the con- ditlon of growth of the host. The intensity of spoculation is dependent on the phsyiological state of the host, the stage of incubation phase at which it occurs, and the isolate of P. tabacina. The interaction between presporulation temperature and time affects sporulation intensity. Significant reduction in response occurs at high or low temperatures when the exposure times exceed 6-8 hours. These results are discussed in relation to the epidemiology of blue mold.

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