Department of Biology, Middle Tennessee State University, Murfreesboro, Tennessee 37132.
Plant Physiol. 1992 Mar;98(3):879-86. doi: 10.1104/pp.98.3.879.
Chlamydomonas reinhardtii expresses a well-documented circadian rhythm of phototaxis, which peaks in the subjective daytime. We find that vegetative cells also express circadian rhythms of chemotaxis to ammonium and ammonium uptake (as gauged by uptake of [(14)C]methylammonium). The chemotaxis rhythm peaks in the subjective night. Methylammonium uptake is light dependent, and its rhythm peaks at subjective dawn. Unlike vegetative cells, gametes are not attracted to ammonium. We believe this to be the first report of a circadian rhythm of chemotaxis.
莱茵衣藻表达了一种有充分文献记录的趋光性昼夜节律,其峰值出现在主观白天。我们发现营养细胞也表现出对铵的趋化性和铵摄取(以 [(14)C] 甲基铵的摄取来衡量)的昼夜节律。趋化性节律的峰值出现在主观夜晚。甲基铵的摄取依赖于光照,其节律的峰值出现在主观黎明。与营养细胞不同,配子不受铵的吸引。我们相信这是首次报道趋化性的昼夜节律。