Yang Zhenyan, Ji Yunheng
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of SciencesKunming, China.
Front Plant Sci. 2017 Sep 11;8:1536. doi: 10.3389/fpls.2017.01536. eCollection 2017.
The Arcto-Tertiary relict genera, , , and represent deep lineages in the asterid order Cornales. Recent phylogenetic studies suggested that these genera should be placed in a newly circumscribed family, Nyssaceae. However, because these analyses were based upon a few genes, it is prudent and necessary to examine further evidence before adopting this taxonomic treatment. In this study, we determined the complete chloroplast (cp) genomes of , , and . Their cp genomes ranged from 156,672 to 158,409 bp, which included 115 genes, and their genome features were highly similar to those of other species within the order Cornales. The phylogenetic relationships among the genera , , , and 23 related taxa in the asterids were analyzed based on 73 protein-coding genes from the cp genomes. All of the previously recognized major clades (namely Cornales, Ericales, Campanulids, and Lamiids) in the asterids, as well as their relationships, were recovered with robust support. A clade including the genera , , , and , was resolved as a well-supported monophyletic group, which was fully separated from the family Cornaceae by the family Hydrangeaceae. Our results provide novel evidence to support the acceptance of the family Nyssaceae outlined by the updated Angiosperm Phylogeny Group.
北极第三纪残遗属、、和代表了菊类植物山茱萸目中的古老谱系。最近的系统发育研究表明，这些属应归入一个新划定的科——蓝果树科。然而，由于这些分析是基于少数几个基因进行的，在采用这种分类处理之前，进一步审查证据是谨慎且必要的。在本研究中，我们测定了、和的完整叶绿体（cp）基因组。它们的cp基因组大小在156,672至158,409 bp之间，包含115个基因，其基因组特征与山茱萸目内的其他物种高度相似。基于cp基因组中的73个蛋白质编码基因，分析了属、、和菊类植物中23个相关类群之间的系统发育关系。菊类植物中所有先前认可的主要分支（即山茱萸目、杜鹃花目、桔梗类和唇形类）及其相互关系都得到了有力支持。一个包括属、、和的分支被确定为一个得到充分支持的单系类群，它通过绣球花科与山茱萸科完全分开。我们的结果为支持接受被子植物系统发育组更新后划定的蓝果树科提供了新证据。
