Department of Plant Resources, College of Industrial Science, Kongju National University, Yesan, 32439, Republic of Korea.
State Key Laboratory of Tea Plant Biology and Utilization, Anhui Agricultural University, Hefei, 230036, Peoples' Republic of China.
Sci Rep. 2017 Mar 3;7:43327. doi: 10.1038/srep43327.
Mitochondrial genome variations have been detected despite the overall conservation of this gene content, which has been valuable for plant population genetics and evolutionary studies. Here, we describe mitochondrial variation architecture and our performance of a phylogenetic dissection of Korean landrace and weedy rice. A total of 4,717 variations across the mitochondrial genome were identified adjunct with 10 wild rice. Genetic diversity assessment revealed that wild rice has higher nucleotide diversity than landrace and/or weedy, and landrace rice has higher diversity than weedy rice. Genetic distance was suggestive of a high level of breeding between landrace and weedy rice, and the landrace showing a closer association with wild rice than weedy rice. Population structure and principal component analyses showed no obvious difference in the genetic backgrounds of landrace and weedy rice in mitochondrial genome level. Phylogenetic, population split, and haplotype network evaluations were suggestive of independent origins of the indica and japonica varieties. The origin of weedy rice is supposed to be more likely from cultivated rice rather than from wild rice in mitochondrial genome level.
尽管线粒体基因组的整体基因组成相对保守，但仍检测到了线粒体基因组的变异，这对于植物群体遗传学和进化研究很有价值。在这里，我们描述了线粒体变异结构，并对韩国地方品种和杂草稻进行了系统发育分析。共鉴定到 10 种野生稻的线粒体基因组中存在 4717 个变异。遗传多样性评估表明，野生稻的核苷酸多样性高于地方品种和/或杂草稻，而地方品种的多样性高于杂草稻。遗传距离表明，地方品种和杂草稻之间存在高水平的杂交，并且地方品种与野生稻的关联比杂草稻更密切。种群结构和主成分分析表明，在线粒体基因组水平上，地方品种和杂草稻的遗传背景没有明显差异。系统发育、种群分裂和单倍型网络评估表明，籼稻和粳稻的起源是独立的。从线粒体基因组水平来看，杂草稻的起源更可能来自栽培稻，而不是野生稻。
