分别在有核和去核的伞藻细胞中，对光/暗周期变化存在约七天和约十三天的生长响应的证据。
Evidence for a circaseptan and a circasemiseptan growth response to light/dark cycle shifts in nucleated and enucleated Acetabularia cells, respectively.
作者信息
Schweiger H G, Berger S, Kretschmer H, Mörler H, Halberg E, Sothern R B, Halberg F
出版信息
Proc Natl Acad Sci U S A. 1986 Nov;83(22):8619-23. doi: 10.1073/pnas.83.22.8619.
Abstract
Nucleated as well as enucleated Acetabularia mediterranea cells were subjected to 14 different patterns of shifts in a regimen of 12 hr of light alternating with 12 hr of darkness in four 30-day long experiments. With one exception, which might be due to a circannual modulation, these experiments showed that nucleated cells had maximal growth rates when a shift was performed every 7th or 15th day. In enucleated cells, maxima were observed on shift schedules that were about 3-4 days rather than about 7 days apart. The results indicate that in the unicellular green alga Acetabularia a rhythm of about 7 days (circaseptan) exists and that removal of the nucleus results in a circaseptan frequency multiplication.
摘要
在四个为期30天的实验中，对有核和去核的地中海伞藻细胞进行了14种不同模式的光照与黑暗交替周期变化处理，光照12小时，黑暗12小时。除了一个可能由年周期调节引起的例外情况外，这些实验表明，当每7天或15天进行一次周期变化时，有核细胞具有最大生长速率。在去核细胞中，最大生长速率出现在周期约为3 - 4天而非约7天的变化处理中。结果表明，在单细胞绿藻地中海伞藻中存在约7天（近一周节律）的节律，并且去除细胞核会导致近一周节律频率加倍。
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