RHYTHMIC CELL DIVISION IN POPULATIONS OF GONYAULAX-POLYEDRA
RHYTHMIC CELL DIVISION IN POPULATIONS OF GONYAULAX-POLYEDRA
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DOI：
10.1111/j.1550-7408.1958.tb02555.x
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发表时间：
1958-01-01
期刊：
影响因子：
--
通讯作者：
HASTINGS, JW
中科院分区：
文献类型：
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作者：
SWEENEY, BM;HASTINGS, JW
在海洋甲藻G. Polyedra在交替的光照和黑暗周期（每个周期12小时）下生长，一天中发生的所有细胞分裂的至少85%发生在跨越黑暗周期结束和光照周期开始的5小时周期内。最近分裂的细胞数量的一个非常明显的最大值大约发生在光周期开始的时候。这种细胞分裂的昼夜周期性在连续的强光下4至6天后消失，但在连续的暗光下将持续至少14天。在恒定条件下的约24小时的时间仅通过改变光强度和温度而稍微改变，已知这两个因素显著地影响世代时间。因此，细胞分裂发生的时间被认为是由某种节律或时钟机制控制的。细胞分裂的节奏和内源性发光的节奏在这种生物体之间的相似性进行了讨论。发生辉光，或稳定的低强度的光发射，在细胞分裂的时间，进行了描述，并建议，这种辉光可能导致伴随细胞分裂的某些阶段的细胞变化。
In cultures of the marine dinoflagellate G. polyedra grown with alternating light and dark periods of 12 hours each, at least 85% of all cell divisions which occur in a day take place during a 5-hour period spanning the end of the dark period and the beginning of the light period. A very distinct maximum in the number of recently divided cells occurs at about the time the light period begins. This diurnal periodicity in cell division is lost after 4 to 6 days in continuous bright light, but will persist for at least 14 days in continuous dim light. The period of approximately 24 hours under constant conditions is only slightly altered by varying light intensity and temperature, both of which factors are known to affect markedly the generation time. The time at which cell division occurs is therefore postulated to be controlled by some sort of rhythmic or clock mechanism. Similarities between the cell division rhythm and the endogenous rhythm of luminescence in this organism are discussed. The occurrence of a glow, or steady light emission of low intensity, at about the time of cell division, is described, and it is suggested that this glow may result from cellular changes accompanying certain stages of cell division.