中国锥属(壳斗科)一新记录种——巨盘锥
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福建农林大学 林学院

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Q949.736.3

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福建农林大学林学高峰学科建设项目(72202200205)


Castanopsis grandicicatricata N. H. Xia D. H. Vuong, a Newly Recorded Species of Castanopsis (Fagaceae) from China
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    摘要:

    【目的】中国壳斗科锥属一新记录种巨盘锥(Castanopsis grandicicatricata),该种原特产于越南中、北部,现于云南屏边苗族自治县大围山地区发现一零星分布的居群。为验证原始文献基于形态学推测的近亲,展示该种所处的系统地位,增加中国锥属植物丰富度。【方法】利用细胞核rRNA基因5.8S、26S间隔区ITS2与叶绿体基因rbcL分子标记重建系统树。【结果】形态因壳斗4.5~6.0 cm,刺树状分枝,坚果扁球形,果脐占坚果表面积2/3,与所有其他已知锥属种类均不同。【结论】公锥(C. mekongensis)是其近缘种之一,与形态学的推测一致;然而属下系统框架并不明朗。新记录对于研究中国滇东南与越南北部植物区系有重要的意义。

    Abstract:

    【Objective】 Castanopsis grandicicatricata N. H. Xia & D. H. Vuong, a newly recorded species of Castanopsis (Fagaceae) from China is reported. This species is originally endemic to central and northern Vietnam, but now a scattered population is discovered in the Dawei Mountain area of Pingbian Miao Autonomous County, Yunnan. The study aims to verify the close relatives of the original literature based on morphological speculation, show the systematic status of this species, and increase the richness of Castanopsis plants in China. 【Methods】 The morphology-based speculation on the close relatives mentioned in the original literature was validated through phylogenetic tree reconstructions using nucleus ITS2 of rRNA gene 5.8S, 26S spacer and chloroplast rbcL molecular markers. 【Results】Morphologically, it can be distinguished from other known Castanopsis species by its cupule 4.5-6.0 cm in diameter, spine base connate into tree-like branched bundles, nut oblate, scar covering ca. 2/3 of the nut. 【Conclusion】 The results confirmed that C. mekongensis is indeed one of its close relatives, consistent with the morphological speculation; however, the overall phylogenetic framework of the genus is not clear. This new record holds significant implications for studying the flora of southeast Yunnan and northern Vietnam.

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  • 收稿日期:2023-08-16
  • 最后修改日期:2023-11-10
  • 录用日期:2023-11-21
  • 在线发布日期: 2024-01-19
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