State Key Laboratory of Hybrid Rice, Key Laboratory for Research and Utilization of Heterosis in Indica Rice of Ministry of Agriculture, Engineering Research Center for Plant Biotechnology and Germplasm Utilization of Ministry of Education, College of Life Science, Wuhan University, Wuhan, 430072, China.
BMC Plant Biol. 2020 Apr 15;20(1):159. doi: 10.1186/s12870-020-02380-w.
In most angiosperms, the inheritance of the mitochondria takes place in a typical maternal manner. However, very less information is available about if the existence of structural variations or not in mitochondrial genomes (mitogenomes) between maternal parents and their progenies.
In order to find the answer, a stable rice backcross inbred line (BIL) population was derived from the crosses of Oryza glaberrima/Oryza sativa//Oryza sativa. The current study presents a comparative analysis of the mitogenomes between maternal parents and five BILs. There were recorded universal structural variations such as reversal, translocation, fusion, and fission among the BILs. The repeat-mediated recombination and non-homologous end-joining contributed virtually equal to the rearrangement of mitogenomes. Similarly, the relative order, copy-number, expression level, and RNA-editing rate of mitochondrial genes were also extensively varied among BILs.
These novel findings unraveled an unusual mystery of the maternal inheritance and possible cause for heterogeneity of mitogenomes in rice population. The current piece of work will greatly develop our understanding of the plant nucleo-cytoplasmic interaction and their potential role in plant growth and developmental processes.
在大多数被子植物中，线粒体的遗传以典型的母系方式发生。然而，关于母本与其后代之间线粒体基因组（线粒体基因组）是否存在结构变异的信息非常少。
为了找到答案，从 Oryza glaberrima/Oryza sativa//Oryza sativa 的杂交中衍生出了一个稳定的水稻回交自交系（BIL）群体。本研究对母本和五个 BIL 之间的线粒体基因组进行了比较分析。在 BIL 中记录了普遍的结构变异，如反转、易位、融合和裂变。重复介导的重组和非同源末端连接对线粒体基因组的重排几乎同样重要。同样，线粒体基因的相对顺序、拷贝数、表达水平和 RNA 编辑率在 BIL 中也广泛变化。
这些新发现揭示了母系遗传的一个不寻常之谜，以及水稻群体中线粒体基因组异质性的可能原因。目前的这项工作将极大地加深我们对植物核质相互作用的理解，以及它们在植物生长和发育过程中的潜在作用。
