Phylogenetic Relationships in the Festuca-Lolium Complex (Loliinae; Poaceae): New Insights from Chloroplast Sequences
Phylogenetic Relationships in the Festuca-Lolium Complex (Loliinae; Poaceae): New Insights from Chloroplast Sequences
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DOI：
10.3389/fevo.2016.00089
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发表时间：
2016-01-01
影响因子：
3
通讯作者：
Huang, Linkai
中科院分区：
文献类型：
--
作者：
Cheng, Yajuan;Zhou, Kai;Huang, Linkai
黑麦草/高羊茅复合体中的物种在自然和人为干预下分散并定居在全球温带草原的大片地区。这个草场中的物种代表了一些最重要的草种，无论是在市容方面还是在农业上都是世界上最重要的。牧草育种者重新燃起了在这些物种之间创造杂交组合的兴趣，现在有几个国家将高羊茅品种作为两个属基因的组合进行销售。这两个属根据其花序结构进行了区分，但几十年来围绕黑麦草-高羊茅复合种的分类一直存在争议。为了更好地了解黑麦草/高羊茅复合体内部的复杂性及其遗传背景，我们重建了黑麦草-高羊茅复合体中重要实例的系统发育。利用两个非编码基因间隔区(trnQ-rps16，trnH-PSBA)和一个编码基因(RbcL)，采集了代表羊茅和黑麦草属植物的40个分类群，其中Vulpia myuros和Brachypodium disachyon为外类群。采用最大简约度(MP)、基于每个分区的贝叶斯推断(BI)分析和组合的叶绿体DNA数据集，以及中位连接网络分析。这些结果强烈地表明，亚基因。Schedonorus与Lolium有密切的关系，也建议移动该教派。亚属的白蜡树。从白垩纪到亚普根。Schedonorus和分离Sect.亚属中的短冠小蜂亚科。白垩纪。我们发现，由于其介于“阔叶”和“细叶”分支之间，因此它可能是一个杂交起源的谱系。
The species within the Lolium/Festuca grass complex have dispersed and colonized large areas of temperate global grasslands both naturally and by human intervention. The species within this grass complex represent some of the most important grass species both for amenity and agricultural use worldwide. There has been renewed interest by grass breeders in producing hybrid combinations between these species and several countries now market Festulolium varieties as a combination of genes from both genera. The two genera have been differentiated by their inflorescence structure, but controversy has surrounded the taxonomic classification of the Lolium-Festuca complex species for several decades. In order to better understand the complexities within the Lolium/Festuca complex and their genetic background, the phylogeny of important examplers from the Lolium-Festuca complex were reconstructed. In total 40 taxa representing the Festuca and Lolium species with Vulpia myuros and Brachypodium distachyon as outgroups were sampled, using two non-coding intergenic spacers (trnQ-rps16, trnH-psbA) and one coding gene (rbcL). Maximum parsimony (MP), Bayesian inference (BI) analyses based on each partition and combined plastid DNA dataset, and median jointing network analysis were employed. The outcomes strongly suggested that the subgen. Schedonorus has a close relationship to Lolium, and it is also proposed to move the sect. Leucopoa from subgen. Leucopoa to Subgen. Schedonorus and to separate sect. Breviaristatae from the subgen. Leucopoa. We found that F. californica could be a lineage of hybrid origin because of its intermediate placement between the "broad-leaved" and "fine-leaved" clade.