Department of Plant Pathology, Kansas State University, 66506, Manhattan, KS, USA.
Theor Appl Genet. 1983 May;65(2):129-44. doi: 10.1007/BF00264880.
Mitochondrial DNAs have been examined in accessions of 25 Mexican races of maize and compared with the mitochondrial DNAs previously found in inbred lines from the USA. Many variants were found. Low molecular weight DNA components, not previously found in US lines, were found in many of the accessions. Accessions classified as belonging to the same race, and plants from a single accession, sometimes had different mitochondrial genomes. Mitochondrial genomes similar to those in T and S cytoplasms were found in Mexican accessions.A low molecular weight linear DNA species has partial homology with a sequence in the high molecular weight mitochondrial genome. All plants with a shorter version of the linear molecule had a correspondingly altered region of homology in the high molecular weight genome.There is evidence that the geographical distribution of mitochondrial DNA types within Mexico is not random. One type, found in the oldest races, appears to be widely dispersed but another less common type appears to be confined largely to coastal regions. The potential value of these findings in maize breeding and for evolutionary studies is discussed.
已经对 25 个墨西哥玉米品种的线粒体 DNA 进行了研究，并与之前在美国系中发现的线粒体 DNA 进行了比较。发现了许多变体。在许多品种中发现了以前在美国系中未发现的低分子量 DNA 成分。被归类为同一品种的品种，以及来自单一品种的植物，有时具有不同的线粒体基因组。在墨西哥品种中发现了与 T 和 S 细胞质中相似的线粒体基因组。一种低分子量线性 DNA 物种与高分子量线粒体基因组中的一个序列具有部分同源性。所有具有较短线性分子版本的植物在高分子量基因组中都有相应改变的同源区域。有证据表明，墨西哥内部线粒体 DNA 类型的地理分布并非随机。一种在最古老的品种中发现的类型似乎分布广泛，但另一种不太常见的类型似乎主要局限于沿海地区。讨论了这些发现对玉米育种和进化研究的潜在价值。
