Harvey K Orel, Todd G B McLay, Lydia K Guja, Marco F Duretto, Michael J Bayly
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引用次数: 0
摘要
Zieria buxijugum、Z. formosa 和 Z. parrisiae 是三个密切相关的极危物种,其分类学有效性值得怀疑。我们研究了这些物种的遗传关系和多样性,以及两个相关但在分类学上不同的同系物 Z. granulata 和 Z. tuberculata,以及一个可能未被描述的类群 Z. aff.利用双位限制性位点相关测序(ddRADseq)生成匿名基因组位点,用于系统发育、网络和遗传结构分析,以及估计濒危物种的遗传多样性。我们的研究结果支持 Z. buxijugum、Z. formosa 和 Z. parrisiae 目前的分类地位,并认为 Z. aff. tuberculata 应被认定为一个独特的物种。我们在这三个极度濒危物种中没有发现近亲繁殖的证据,并发现它们的遗传多样性与更广泛分布的物种 Z. granulata 和 Z. tuberculata 相似。将澳大利亚国家植物园原地采集的植物材料与野生植物进行比较,发现有几种极度濒危物种的基因型在原地采集的植物材料中没有体现,我们为将来纳入这些未体现的基因型提出了建议。
Genomic data inform taxonomy and conservation of Critically Endangered shrubs: a case study of Zieria (Rutaceae) species from eastern Australia
Zieria buxijugum, Z. formosa, and Z. parrisiae are three closely related, Critically Endangered species of questionable taxonomic validity that occur within six kilometres of each other on the south coast of New South Wales, Australia. We investigated genetic relationships and diversity of these species, along with two related but taxonomically distinct congeners, Z. granulata and Z. tuberculata, and a possible undescribed taxon, Z. aff. tuberculata. Double-digest restriction-site associated sequencing (ddRADseq) was used to generate anonymous genomic loci that were used for phylogenetic, network, and genetic structure analyses, and for estimating genetic diversity of the threatened species. Our results support the current taxonomic status of Z. buxijugum, Z. formosa, and Z. parrisiae, and suggest that Z. aff. tuberculata warrants recognition as a distinct species. We detected no evidence of inbreeding in the three Critically Endangered species, and found their genetic diversity to be similar to that of the more widespread species Z. granulata and Z. tuberculata. Comparison of plant material held in ex situ collections at the Australian National Botanic Gardens with wild plants highlighted several genotypes of the Critically Endangered species that are not represented in the ex situ collection, and we provide suggestions for the future inclusion of those unrepresented genotypes.
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.