植物学报 ›› 2015, Vol. 50 ›› Issue (5): 549-564.DOI: 10.11983/CBB15164

• 研究论文 • 上一篇    下一篇

利用低拷贝核基因重建菊科紫菀亚科族间系统发育关系

刘勉1,2, 张彩飞1,2,,A;*, 黄建勋1,2, 马红1,2,,A;*   

  1. 1复旦大学生命科学学院, 上海 200438
    2复旦大学植物科学研究所, 上海 200438
  • 收稿日期:2015-08-15 接受日期:2015-09-05 出版日期:2015-09-01 发布日期:2015-10-09
  • 通讯作者: 张彩飞,马红
  • 作者简介:? 共同第一作者
  • 基金资助:
    国家自然科学基金(No.91131007)

Phylogenetic Reconstruction of Tribal Relationships in Asteroi- deae (Asteraceae) with Low-copy Nuclear Genes

Mian Liu1,2, Caifei Zhang1,2*, Chien-Hsun Huang1,2, Hong Ma1,2*   

  1. 1School of Life Sciences, Fudan University, Shanghai 200438, China
    2Institute of Plant Biology, Fudan University, Shanghai 200438, China
  • Received:2015-08-15 Accepted:2015-09-05 Online:2015-09-01 Published:2015-10-09
  • Contact: Zhang Caifei,Ma Hong
  • About author:? These authors contributed equally to this paper

摘要: 紫菀亚科(Asteroideae)是菊科最大的一个亚科, 包含的种数多于被子植物的绝大多数科。目前, 紫菀亚科族间的系统发育关系主要依赖于叶绿体基因信息, 但是叶绿体基因为单亲遗传, 并不能完整反映进化历史。鉴于杂交现象在菊科普遍存在, 故利用核基因可以反映更完整的紫菀亚科进化历史。该研究首次使用从转录组数据(20个新测+11个从NCBI数据库下载)中筛选出的47个直系同源低拷贝核基因来研究紫菀亚科的系统发育关系, 共选取了29个物种, 代表了紫菀亚科20个族中的13个族。用超矩阵分析方法和溯祖推测分析方法各获得了1个稳定的紫菀亚科系统树, 每个树上绝大多数分支都得到了高度支持, 且2个树之间没有明显的冲突。新的紫菀亚科族间系统发育关系揭示了千里光超族应并入紫菀超族, 春黄菊族可能是千里光族与紫菀族杂交起源的, 金鸡菊族很可能也是杂交起源的。该研究结果显示低拷贝核基因可以更好地解决科以下分类阶元的系统发育关系, 对菊科乃至被子植物其它科的系统发育研究具有重要的借鉴意义。

关键词: 菊科, 紫菀亚科, 低拷贝核基因, 系统发育, 转录组测序

Abstract: Asteroideae is the largest subfamily of the daisy family, Asteraceae, with more species than most other angiosperm families. Previous phylogenetic relationships of Asteroideae tribes were mostly based on chloroplast genes, which are uniparentally inherited and could not reflect the entire evolutionary histories. Especially considering the widespread phenomenon of hybridization in Asteraceae, low-copy nuclear genes with biparental inheritance can better serve as phylogenetic markers, for a more complete understanding of their evolution. To resolve the intertribal relationships in Asteroideae, transcriptomic datasets were newly generated by sequencing 20 species and additional datasets for 11 species downloaded from NCBI, representing 13 tribes and all 3 supertribes of this subfamily. Extensive sequence analyses of the 31 datasets resulted in the selection of 47 orthologous nuclear genes for phylogenetic reconstruction. Using the supermatrix analyses and coalescent estimates, we obtained robust and highly supported species trees, which are in agreement with each other. New intertribal phylogenies of Asteroideae revealed that: (1) the supertribe Senecionodae should be merged into the supertribe Asterodae; (2) Anthemideae possibly originated from a hybrid of ancestors of Senecioneae and Astereae; and (3) Coreopsideae is probably also hybrid originated. This study demonstrates that low-copy nuclear genes are good markers for infra-familial phylogenetic reconstruction and provides a foundation for future studies of phylogeny of Asteraceae and other angiosperm families.

Key words: Asteraceae, Asteroideae, low-copy nuclear genes, phylogeny, transcriptome-sequencing