昼夜节律的转录调控
Transcriptional regulation by a circadian rhythm.
作者信息
Taylor W C
机构信息
Commonwealth Scientific and Industrial Research Organization, Division of Plant Industry, Canberra, A.C.T., Australia.
出版信息
Plant Cell. 1989 Feb;1(2):259-64. doi: 10.1105/tpc.1.2.259.
Abstract
Transcription of genes encoding the light-harvesting chlorophyll a/b protein (Cab) was shown previously to be regulated by light and a number of developmental factors. I show that a circadian rhythm in transcriptional activity is superimposed on these other regulatory programs. In vitro transcription measurements in isolated maize leaf nuclei demonstrated that changes in transcription are not coincident with light-dark transitions and that diurnal changes in transcription continue in continuous light and disappear in complete darkness. Light intensity influences the amplitude of transcriptional changes but has no effect on periodicity. Major diurnal changes in Cab mRNA are evident not only in developing seedling leaves, but also in mature, fully expanded leaves. Genes encoding phosphoenolpyruvate carboxylase and the cytosolic form of aldolase show no diurnal changes in transcription.
摘要
先前已表明，编码光捕获叶绿素a/b蛋白（Cab）的基因转录受光照和许多发育因子的调控。我发现转录活性的昼夜节律叠加在这些其他调控程序之上。在分离的玉米叶片细胞核中进行的体外转录测量表明，转录变化与光暗转换不一致，并且转录的昼夜变化在持续光照下持续存在，在完全黑暗中消失。光强度影响转录变化的幅度，但对周期性没有影响。Cab mRNA的主要昼夜变化不仅在发育中的幼苗叶片中明显，在成熟、完全展开的叶片中也很明显。编码磷酸烯醇式丙酮酸羧化酶和醛缩酶胞质形式的基因在转录中没有昼夜变化。
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