シトリニンのタバコモザイクウイルス感染に対する影響

概要

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Citrinin iso1ated from cultures of Penici11ium sp. AK-019 had a markedly inhibitory effect on 1oca1 1esion formation on Nicotiana glutinosa leaves caused by tobacco mosaic virus (TMV). This paper reports the influence of this antibiotic on TMV infection. (1) When 100 μg/ml of citrin in were infiltrated in to N. glutinosa leaves through the petioles or by placing the 1ower surfaces of detached leaves on the solution, 1oca1 1esion formation was almost completely inhibited. Even though by dipping the inoculated leaves into the solution for a few minutes, a considerable inhibitory effect on lesion formation was observed. On the other hand, citrinin did not affect TMV infection when TMV and citrinin were mixed in vitro and inoculated on N. glutinosa leaves. (2) Although 1oca1 1esions were not formed on N. glutinosa leaves by the treatment with citrinin of 100μg/ml, infectious TMV apparently multip1ied in the leaves and the TMV concentration gradua11y decreased with the pro1onged times of treatment. In the case of citrinin concentration be1ow 10 μg/ml, however, TMV multiplied at the same rate as did in nontreatment. (3) The effect of citrinin, which inhibits or delays the 1oca1 1esion production by TMV on N. glutinosa leaves, is presumably caused by the delay of the rate of TMV multip1ication in the leaves. It is suggested that this antibiotic acts simply on the surface of inoculated leaves.
1969-06-30