Rhabdom size and photoreceptor membrane turnover in a muscoid fly
Rhabdom size and photoreceptor membrane turnover in a muscoid fly
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粘蝇的横纹大小和光感受器膜周转
DOI：
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发表时间：
2004
影响因子：
3.6
通讯作者：
David S. Williams
中科院分区：
文献类型：
--
作者：
David S. Williams
绿蝇（Lucilia）复眼的横纹肌横截面积在12 h光/12 h暗循环光照和10 d恒定光照或黑暗条件下保持恒定。在黑暗10天后的3小时光照期间（21%），或在10天光照后暴露于2小时黑暗+1.5小时光照时（10%），其仅略微降低。形态学证据表明，在营业额的光感受器膜脱落是通过细胞外途径，并从微绒毛的基础上的胞饮作用。由这两种机制脱落的感光膜似乎积聚在多泡体中。光感受器膜脱落的量，如多泡体的数量所示，在周期性照明的整个白天和夜晚是恒定的，在恒定的黑暗中减少，但在暴露于3小时光照后10天黑暗后恢复到其正常水平。
SummaryThe cross-sectional area of rhabdomeres in the compound eye of the blowfly, Lucilia, was found to remain constant under 12 h light/12 h dark cyclic lighting, and 10 days constant light or darkness. It was reduced only slightly during 3 h light after 10 days darkness (by 21%), or on exposure to 2h darkness + 1.5 h light after 10 days light (by 10%). Morphological evidence indicates that shedding of photoreceptor membrane during turnover is achieved by an extracellular route, and by pinocytosis from the bases of the microvilli. The photoreceptor membrane shed by both mechanisms appears to accumulate in multivesicular bodies. The amount of photoreceptor membrane shedding, as indicated by numbers of multivesicular bodies, is constant throughout the day and night on cyclic lighting, decreases in constant darkness, but returns to its normal level after an exposure to 3 h light subsequent to 10 days darkness.