ゴキブリの卵鞘形成に対する紫外線の阻害効果 (II) : 紫外線感受性の日周変動

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The females of Periplaneta americana and P. australasiae in the first stage of oothecal formation were irradiated on the head with UV rays to examine the daily change of their sensitivity to the UV rays. One group of these female cockroaches was reared under the photo-regimen of 12L : 12D, the light phase was continued from 7 : 00 to 19 : 00. The other group was kept in the light phase of 5 : 00 to 17 : 00. A 10-watt mercury lamp which emits UV rays mostly of 253.7nm was used for irradiation at the rate of 100μW. (cm)^<-2>. (sec)^<-1> for 10min as reported previously. The results of UV irradiation experiments on the head of both the groups revealed a daily change of UV sensitivity which was expressed as various inhibitory effects on the oothecal formation, depending on the time of the day when they were irradiated. The sensitivity of cockroaches to the UV irradiation seemed very low at the early light phase, but when irradiated during 5hr prior to light-off, they responded to the irradiation by depositing more or less abnormal oothecae. During the first 4hr of light phase, the inhibitory effect of the UV rays could not be detected in the females even when they were exposed with a larger dose of the UV rays. In contrast, when the females were severed at the optic tracts and irradiated on the head in the first 4hr of light phase, they deposited abnormal oothecae. From these results it is suggested that the physiological mechanism controlling the circadian rhythms in the cockroaches might have intercepted the effect of UV rays during the early light phase.
1984-12-15

ゴキブリの卵鞘形成に対する紫外線の阻害効果 (II) : 紫外線感受性の日周変動

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