Evolutionary history, traits, and weediness in Digitaria (Poaceae: Panicoideae)

IF 2.3 2区 生物学 Q2 PLANT SCIENCES
Sami Touafchia, Olivier Maurin, Boonchuang Boonsuk, Trevor R Hodkinson, Pranom Chantaranothai, Nantenaina Rakotomalala, Fenitra Randrianarimanana, Jean Augustin Randriamampianina, Shyamali Roy, Lorna MacKinnon, Mijoro Rakotoarinivo, Guillaume Besnard, Thomas Haevermans, Maria S Vorontsova
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引用次数: 0

Abstract

Abstract Digitaria is a large pantropical genus, which includes a number of economically problematic agricultural weeds. Difficulties in species identification and the circumscription of the genus have previously hindered progress in understanding its evolution and developing a stable classification. We investigate the evolutionary history of Digitaria by combining two approaches: (i) phylogenetic analyses of the currently available Sanger sequence data with previously unpublished sequences mainly from South East Asia, and (ii) newly generated genomic data from low-copy nuclear genes obtained using the Angiosperms353 probe kit, with new data mainly from Madagascar. Both methods gave congruent results. The combination of these results allowed us to confirm a new clade structure within Digitaria lineages, in partial agreement with the previous morphology-based classifications. We confirm that Digitaria as traditionally circumscribed is not monophyletic, comprising Anthephora, Baptorhachis, Chaetopoa, and Chlorocalymma. We present an inference of key character evolution with morphological support for clades with spikelets arranged in binate and ternate groups, with variable trichome morphology, spikelet length, and culm length. Geographical clade structure is also observed. No phylogenetic signal of weedy function was observed.
黄连属植物的进化历史、性状及杂草性
Digitaria是一个大型泛热带属,其中包括许多经济上存在问题的农业杂草。物种鉴定的困难和属的界定阻碍了对其进化的理解和建立稳定的分类。研究人员通过两种方法对Digitaria的进化史进行了研究:(i)将现有的Sanger序列数据与先前未发表的主要来自东南亚的序列进行系统发育分析;(ii)使用Angiosperms353探针试剂盒获得的低拷贝核基因新生成的基因组数据,主要来自马达加斯加。两种方法的结果都是一致的。这些结果的结合使我们能够在Digitaria谱系中确认一个新的分支结构,与先前基于形态的分类部分一致。我们证实,传统上界定的Digitaria不是单系的,包括Anthephora, baptorhachhis, Chaetopoa和Chlorocalymma。我们提出了一个基于形态学支持的关键性状进化的推断,这些进化枝的小穗排列在二叉和三叉群中,具有可变的毛状体形态、小穗长度和秆长。地理分支结构也被观察到。未观察到杂草功能的系统发育信号。
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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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