Japanese Journal of Phytopathology
Online ISSN : 1882-0484
Print ISSN : 0031-9473
ISSN-L : 0031-9473
On the germination of the conidia of Piricularia Oryzae in the water drops on the leaves of rice seedlings treated with Cephalothecin
Hiromu YOSHII
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1951 Volume 15 Issue 1 Pages 13-16

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Abstract
Germination of the conidia of the rice blast fungus, Piricularia Oryzae, in the water drops on the leaves of rice plants, treated with Cephalothecin, an antibiotic substance obtained from culture filtrate of Cephalothecium sp., was inhibited in proportion to the concentration of the solution. The treatment with Cephalothecin solution was made either by soaking the rice seeds for 3 days or by immersing the roots of rice seedlings for 12 hours. A tendency of reduction in percentage of appressorium formation was also recognized.
As a result of inoculation, the number of infections on the leaves of rice seedlings previously treated with Cephalothecin was significantly less than on non-treated. The retardation in germination of conidia and appressorium formation prior to the penetration may be of primary significance for the lowering of infections. The fact that the actual number of the lesions was less than the calculated number of penetrated conidia per 1cm length of leaf, suggests that the treatment may also influence the development of the fungus within the host plant after penetration.
The macerated powder of dried mycelium of Cephalothecium showed the similar effect upon the germination of conidia in the water drop on the rice plants.
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© The Phytopathological Society of Japan
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