PHOTOSENSITIVITY IN THE CIRCADIAN HATCHING RHYTHM OF THE CAROTENOID-DEPLETED SILKWORM, BOMBYX-MORI

被引:22
作者
SAKAMOTO, K [1 ]
SHIMIZU, I [1 ]
机构
[1] KYOTO UNIV,CTR ECOL RES,KYOTO 606,JAPAN
关键词
BOMBYX MORI; CAROTENOID DEPLETION; HATCHING RHYTHM; PHOTORECEPTION; CIRCADIAN RHYTHM; PHASE SHIFT;
D O I
10.1177/074873049400900106
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Silkworms (Bombyx mori) were reared on a carotenoid-deprived artificial diet, and the carotenoid-depleted eggs of the next generation were incubated so that we could observe the effect of the depletion on the circadian rhythm of hatching. The phototactic response curves of newly hatched larvae showed that the visual photosensitivity in ocelli of larvae from the carotenoid-depleted eggs was at least 4 log units lower than that of a carotenoid-rich control group. However, the phase-shift experiment revealed that carotenoid depletion did not reduce the photosensitivity in the hatching rhythm. When the hatching rhythm was generated by exposure to a single light pulse in constant darkness, the first peak in the rhythm of the carotenoid-depleted silkworms occurred significantly earlier than that of the carotenoid-rich group, but the following second peaks of both groups were found at the same time. These results suggest that for the silkworm, carotenoid is not involved in photoreception for the hatching rhythm, but is involved in the timing of hatching.
引用
收藏
页码:61 / 70
页数:10
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