Phylogeography and chromosome number variation in Micranthes nelsoniana and related species (Saxifragaceae) in Northeast Asia

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Tomoko Fukuda, Naoko Ishikawa, Olga A Chernyagina, Vyacheslav Y Barkalov, Aleksandr A Taran, Valentin V Yakubov, Elena A Marchuk, Elena V Linnik, Ichiro Tamaki
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引用次数: 0

Abstract

Abstract Micranthes nelsoniana possesses multiple different variants and numerous chromosomes. Based on the internal transcribed spacer (ITS) and chloroplast (cp)DNA sequences, the phylogeography of M. nelsoniana and its relatives in Northeast Asia was investigated, with extensive sampling around the Kuril Islands. The Arctic–Asian continent and a clade of marginal islands were the two main groupings that comprised the ITS phylogenetic tree. The island clade was separated into five well-supported clades: Kamchatka and Hokkaido highlands, Kuril–Aleutian Islands, southern Kuril Islands, Japanese archipelago, and Primorye region. Micranthes fusca was found in Japan and in the southern Kuril Islands. It is a separate species that created several types of hybrids between M. nelsoniana in the centre of the Kuril Islands based on a comparison of the ITS and cpDNA networks. Micranthes nelsoniana and M. ohwii appear to have hybridized in the northern Kuril Islands. Cytological investigation on the local species of M. nelsoniana showed that the chromosomal numbers are: 2n = 24, 26, 28, 30, 50, and 80. Among them, two usual numbers to this area, 2n = 24 and 50, appear to encourage interspecific gene exchange. The genomes of Hokkaido plants with high chromosome counts were cloned, revealing that they contained genes of both continental and marginal origins. This study revealed the crucial role of marginal islands along Northeast Asia in the genetic diversity of M. nelsoniana and related species.
东北亚蜜兰花及其近缘种的系统地理学和染色体数目变异
蜜兰花具有多种不同的变异和众多的染色体。基于内部转录间隔段(ITS)和叶绿体(cp)DNA序列,在千岛群岛(Kuril Islands)附近广泛取样,对东北地区nelsoniana及其近缘种进行了系统地理研究。北极-亚洲大陆和边缘岛屿的一个分支是构成ITS系统发育树的两个主要分组。岛屿分支被分为5个支持良好的分支:堪察加和北海道高地,千岛群岛-阿留申群岛,南千岛群岛,日本群岛和滨海地区。在日本和南千岛群岛发现了狐獴。根据ITS和cpDNA网络的比较,它是一个独立的物种,在千岛群岛中心的M. nelsoniana之间创造了几种类型的杂交。在千岛群岛北部,nelsoniana和M. ohwii似乎已经杂交了。对当地种nelsoniana的细胞学调查表明,染色体数目为:2n = 24、26、28、30、50和80。其中,该区域的两个常见数字2n = 24和50似乎促进了种间基因交换。对染色体数较高的北海道植物基因组进行了克隆,发现它们同时含有大陆起源和边缘起源的基因。本研究揭示了东北亚边缘岛屿对黑毛鼠及其近缘种遗传多样性的重要作用。
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来源期刊
CiteScore
5.70
自引率
8.30%
发文量
54
审稿时长
3.5 months
期刊介绍: The Botanical Journal of the Linnean Society publishes original papers on systematic and evolutionary botany and comparative studies of both living and fossil plants. Review papers are also welcomed which integrate fields such as cytology, morphogenesis, palynology and phytochemistry into a taxonomic framework. The Journal will only publish new taxa in exceptional circumstances or as part of larger monographic or phylogenetic revisions.
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