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淀粉质体DNA的研究现状
引用本文:杨海,孙德兰,杨德奎.淀粉质体DNA的研究现状[J].山东科学,2008,21(1):51-56.
作者姓名:杨海  孙德兰  杨德奎
作者单位:1. 山东师范大学生命科学学院,山东,济南,250014;中国科学院植物研究所,北京,100093
2. 中国科学院植物研究所,北京,100093
3. 山东师范大学生命科学学院,山东,济南,250014
摘    要:淀粉质体含有丰富的DNA,平均每个淀粉质体含有数百个基因组拷贝。其分布特点因物种而异,大都集中于拟核区,有的分散于质体内。在淀粉质体发育过程中,DNA含量不断增加,成熟期达到顶峰,以贮藏形态存在,为种子的萌发和幼苗的形态建成提供核苷酸等原料。淀粉质体DNA具有与叶绿体DNA同源的序列,存在一些表达基因,如:16SrRNA、psbA。但在抑制区域富甲基化,尤其是5-甲基胞嘧啶,碱基的甲基化在aDNA基因的表达调控中起重要作用。

关 键 词:淀粉质体DNA  基因组  甲基化  基因表达调控
文章编号:1002-4026(2005)01-0051-06
修稿时间:2007年10月14

A Surrey of the Research on DNA
YANG Hai,SUN De-lan,YANG De-kui.A Surrey of the Research on DNA[J].Shandong Science,2008,21(1):51-56.
Authors:YANG Hai  SUN De-lan  YANG De-kui
Institution:YANG Hai, SUN De-lan, YANG De-kui ( 1. School of Life Science, Shandong Normal University, Jinan 250014, China ; 2. Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China)
Abstract:Amyloplasts include abundant DNA, each of which involves hundreds of genome copies on average. The distribution of DNA is based on different species, most of which accumu late in the nucleoids, others disperse in the plastid. The number of Amyloplast DNA(aDNA) constantly increases during the development of amyloplast till the maximum in adult stage which are stored in the plastid in order to provide nucleotldes for seeds germination and seedings shapes. Amyloplast DNA, homologous to the chloroplast DNA, has some expression genes such as 16SrRNA and psbA,but a variety of methylated bases, especially 5-methylcytosine, are in the suppression areas. DNA methylation plays an important role in the regulation of amyloplast genes expressions.
Keywords:amyloplast DNA  genome  methylation  gene expression and regulation
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