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首页> 外文期刊>Journal of Plant Research >Molecular phylogeny of casuarinaceae based on rbcL and matK gene sequences
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Molecular phylogeny of casuarinaceae based on rbcL and matK gene sequences

机译：基于rbcL和matK基因序列的木麻科分子系统发育

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摘要

We present the first overall molecular phylogenetic study of Casuarinaceae on the basis of sequences of two chloroplast genes, rbcL (1310 bp) and matK (1014 bp), using 15 species representing the family. The study included analyses of Ticodendron (Ticodendraceae) and three species of Betulaceae as close relatives, and one species each of Juglandaceae and Myricaceae as outgroups. Analyses based on matK gene sequences, which provided a much better resolution than the analyses based on rbcL gene sequences alone, resulted in a single most parsimonious tree whose topology is almost identical with the strict consensus tree generated by the combined data set of rbcL and matK gene sequences. Results showed that Casuarinaceae are monophyletic, comprising four distinct genera, Allocasuarina, Casuarina, Ceuthostoma and Gymnostoma, which were not recognized until recently. Within the family, Gymnostoma is positioned at the most basal position and sister to the remainder. Within the remainder Ceuthostoma is sister to the Allocasuarina-Casuarina clade. Morphologically the basalmost position of Gymnostoma is supported by plesiomorphies such as exposed stomata in the shallow longitudinal furrows of the branchlets, a basic chromosome number x=8 and the gynoecium composed of two fertile, biovulate carpels. The three other genera, Allocasuarina, Casuarina, and Ceuthostoma, have invisible stomata in the deep longitudinal furrows of the branchlets, a higher basic chromosome number x=9 or 10-14 (unknown in Ceuthostoma), the gynoecium composed of one fertile and one sterile carpel with a single ovule (unknown in Ceuthostoma). The diversity of infructescence morphology found in the latter three genera suggests that they may have evolved in close association with the elaboration of fruit dispersal mechanisms.
机译：我们基于两个叶绿体基因rbcL（1310 bp）和matK（1014 bp），使用代表该科的15个物种，对木麻黄科进行了首次总体分子系统发育研究。这项研究包括对Ticodendron（Ticodendraceae）和3种桦科（Betulaceae）作为近亲进行了分析，对Juglandaceae和Myricaceae分别进行了1种分析。与仅基于rbcL基因序列的分析相比，基于matK基因序列的分析提供了更好的分辨率，从而生成了一个最简约的树，其拓扑结构与由rbcL和matK的组合数据集生成的严格共识树几乎相同基因序列。结果表明木麻黄科是单系的，包括四个不同的属，异花草科，木麻黄科，盲肠寄主瘤和裸毛瘤，直到最近才被发现。在家庭中，裸子瘤位于最基础的位置，其余则为姊妹。在剩下的地方中，Ceuthostoma是Allocasuarina-Casuarina进化枝的姐妹。从形态上讲，裸子瘤的最基端位置受到多形性的支持，例如小枝的浅纵向犁沟中的裸露气孔，基本染色体数x = 8和由两个可育的，有生物活力的心皮组成的妇科。其他三个属，异地索藻属，木麻黄属植物和盲肠寄主瘤，在小枝的深纵沟中有不可见的气孔，较高的基本染色体数x = 9或10-14（在盲肠寄主瘤中未知），由一个可育和一个组成的妇科单胚珠的不育心皮（在盲肠寄主中未知）。在后三个属中发现的果肉形态的多样性表明，它们可能与果实散布机制的形成密切相关。

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