キュウリベと病菌分生胞子の生存力におよぼす太陽光線の影響
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概要
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The longevity of conidia of Pseudoperonospora cubensis had been studied by Iwata, one of the authors, in 1948. In the present experiment it was further studied, especia11y in connection with the influence of sun 1ight. The results are as fo11ows: (1) From the results of the germination and inoculation tests, using about 70-100 thousand conidia, it was found that some conidia could survive for 20-45 days of preservation in darkness at 5-7℃ and 17℃, although the percentage of survived conidia decreased as the days of preservation became 1onger (Table l). No significant difference in the 1ongevity of conidia was observed between at 5-7℃ and at 17℃ of preservation, although the germination percentage of conidia preserved at 17℃ was more or less higher than that at 5-7℃ (Table l). The 1ongevity of conidia preserved at 24, 27, or 30℃ was sma11er than. that at 5-7 or 17℃, but some conidia could survive for five days at these temperatures (Table 2). (2) Influence of sun 1ight on the 1ongevity of conidia was tested repeatedly on fine days in August 1956 and in May 1957 on the roof of the Nationa1 Institute of Agricaltural Sciences, Tokyo, using an apparatus shown in Fig. 1 to e1iminate the rise of temperature by sun 1ight. The results showed that sun 1ight had no influence on the 1ongevity of conidia (Tables 3 and 4). (3) The conidia were exposed to a Mazda fluorescent lamp FL20E, which is 270mμ in the shortest wave length and 310mμ in an energy peak (Fig. 2). The percentage of conidial germination, decreased with irradiation of more than 3 hours at the distance of 30cm (Fig. 4). Such effect could not be observed when the wave length less than 290mμ was cut out by use of some fi1ters (Fig. 3 and Table 5). From these results it is supposed that sun 1ight has no influence on the 1ongevity of conidia of this fungus in natural conditions, because the shortest wave length of sun 1ight which can reach on earth, is be11eved to be about 300mμ.
- 日本植物病理学会の論文
- 1968-02-29
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- キュウリベと病菌分生胞子の生存力におよぼす太陽光線の影響