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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >THE COURSE OF CHLOROPLAST DNA REPLICATION AND ITS RELATIONSHIP TO OTHER REPRODUCTIVE PROCESSES IN THE CHLOROPLAST AND NUCLEOCYTOPLASMIC COMPARTMENT DURING THE CELL CYCLE OF THE ALGA SCENEDESMUS QUADRICAUDA
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THE COURSE OF CHLOROPLAST DNA REPLICATION AND ITS RELATIONSHIP TO OTHER REPRODUCTIVE PROCESSES IN THE CHLOROPLAST AND NUCLEOCYTOPLASMIC COMPARTMENT DURING THE CELL CYCLE OF THE ALGA SCENEDESMUS QUADRICAUDA

机译：藻类拟南芥细胞周期中叶绿体和核胞质区叶绿体DNA复制的过程及其与其他生殖过程的关系

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DNA containing structures (cellular, chloroplast and mitochondrial nuclei) were stained with the fluorochrome DAPI. Fluorescence intensity, as a measure of DNA content, was estimated during the mitotic cycle in synchronized populations of the chlorococcal alga, Scenedesmus quadricauda. In cells yielding eight daughter cells, three consecutive steps in chloroplast DNA increase occurred over one mitotic cycle. The first step was performed shortly after releasing the daughter cells, the second and third steps occurred consecutively during the first half of the mitotic cycle. Commitment to chloroplast DNA replication was chronologically separated from commitment to division of chloroplast nuclei, revealing that these two chloroplast reproductive steps were under different control mechanisms. The replication of chloroplast DNA occurred at a different time to that of cell-nuclear DNA. The coordination of chloroplast reproductive processes and those in the nucleocytoplasmic compartment were governed by the mutual trophic and metabolic dependency of these compartments rather than by any direct or feedback control controlled by either of them. [References: 32]
机译：含有DNA的结构（细胞，叶绿体和线粒体细胞核）用荧光染料DAPI染色。荧光强度，作为DNA含量的一种测量，是在有丝分裂周期的氯球菌藻类（Scenedesmus quadricauda）同步种群中估计的。在产生八个子细胞的细胞中，叶绿体DNA增加的三个连续步骤在一个有丝分裂周期中发生。第一步在释放子细胞后不久进行，第二步和第三步在有丝分裂周期的前半段连续发生。对叶绿体DNA复制的承诺与对叶绿体核分裂的承诺按时间顺序分开，这表明这两个叶绿体繁殖步骤处于不同的控制机制下。叶绿体DNA的复制发生在与细胞核DNA不同的时间。叶绿体生殖过程与核质区室的协调是由这些区室的相互营养和代谢依赖性决定的，而不是由它们中任何一个控制的直接或反馈控制。 [参考：32]

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