云南樟科植物一新种——华樟
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1.云南省林业和草原科学院;2.云南无量山国家级自然保护区南涧管护局

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云南省极小种群野生植物拯救保护专项(2022SJ07X-01);云南南省中青年学术和技术带头人后备人才项目(202205AC160041)


Cinnamomum huae (Lauraceae): A new species from Yunnan, China
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    摘要:

    【目的】研究确定及报道在中国云南省南涧县发现的樟科桂属植物一新种——华樟(Cinnamomum huae Y. Chai & Yuan Y. Li)。【方法】通过形态学与形态相似种进行比较,并通过与近缘种进行基于叶绿体基因组数据的分子系统学研究来证实该种为新分类群。【结果】该种与同属的茶果樟(C. chago B.S. Sun & H.L. Zhao)形态上近似,均为羽状脉,叶对生或近对生,具长尾尖,但该种小枝被微柔毛,顶芽密被毛,叶片背面灰白色,被微柔毛,边缘具波状起伏,果实厚扁球形,二者可明显区别。该种的叶绿体基因组大小为154 078 bp,比茶果樟长1 325 bp,比同属的刀把木(C. pittosporoides)长1348bp,在反向重复区比茶果樟及刀把木都多了1个678 bp的片断;在35种樟科植物构建的系统发育进化树中,该种与刀把木和其它物种形成3个独立的平行分支,且由于该种与茶果樟形态上近似,表明该种可能是桂属新的进化单元。【结论】形态学特征及叶绿体基因组分析结果支持该种为独立的物种。

    Abstract:

    [Objective] The study aims to identify and describe a new species Cinnamomum huae (Lauraceae), which collected from Nanjian, Yunnan in Southwest China. [Methods] This species was confirmed as a new taxa by morphological comparison with morphologically similar species and molecular phylogenetic study based on chloroplast genome data with related species. [Results] The new species is similar to C. chago in pinnately veined, leaves opposite or subopposite, long acumen, but differs in current year branchlets sparsely puberulent, terminal bud densely pubescent, leaf blade gray green abaxially and puberulent, margin undulate and fruit oblate. The chloroplast genome size of this species is 15 4078 bp, 1 325 bp longer than C. chago and 1 348 bp longer than C. pittosporoides, which has being an extra 678 bp fragment in the inverted repeat region.compared to C. chago and C. pittosporoides. In the phylogenetic tree constructed using maximum likelihood method based on whole chloroplast genome of 35 Lauraceae species, C. huae formed independent parallel branches with C. pittosporoides and other species. [Conclusion] Both the morphological and phylogenetic research indicate C. huae should be a distinct species.

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李园园,武力,吴涛,等.云南樟科植物一新种——华樟[J].西北植物学报,2024,44(10):1665-1672

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  • 收稿日期:2024-01-25
  • 最后修改日期:2024-05-01
  • 录用日期:2024-05-06
  • 在线发布日期: 2024-09-24
  • 出版日期: 2024-10-01
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