摘要
【目的】巨盘锥(Castanopsis grandicicatricata)是原产于越南中、北部的壳斗科锥属植物,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。为确定该种的身份,检验原始文献基于形态学推测的近亲,并展示该种所处的系统地位。【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】形态上,该种壳斗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,与中国已知锥属均不同。分子系统树支持形态学推测,湄公锥(C.mekongensis)是其近缘种之一。【结论】巨盘锥是中国锥属一新记录种,这对于研究中国滇东南与越南北部植物区系有重要的意义。
[Objective]Castanopsis grandicicatricata N.H.Xia&D.H.Vuong is a species of Castanop-sis(Fagaceae)originally endemic to central and northern Vietnam,but now a scattered population was discovered in the Dawei Mountain area of the Pingbian Miao Autonomous County,Yunnan Province,Chi-na.This study aims to check its identity,to verify the close relatives from the literatures based on mor-phological speculation,and to show its systematic status.[Methods]Spacer ITS2 of nuclear rRNA genes 5.8S and 26S and chloroplast gene rbcL were used as molecular markers to reconstruct systematic tree.[Results]Morphologically,it could be distinguished from other Castanopsis species known in China by its cupule of 4.5-6.0 cm in diameter and the spine base was connate into tree-like branched bundles with a spheroid nut,where scar covering ca.2/3 of the nut.The morphology-based speculation of the close rela-tives reported in the literatures was validated through phylogenetic tree restruction,C.mekongensis is one of its close relative.[Conclusion]C.grandicicatricata is a newly recorded species of Castanopsis from China.This new record holds significant implication for the study of the flora of southeast Yunnan and northern Vietnam.
作者
林毅喆
付厚华
陈世品
LIN Yizhe;FU Houhua;CHEN Shipin(Forestry College,Fujian Agriculture and Forestry University,Fuzhou 350002,China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2024年第3期511-516,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
福建农林大学林学高峰学科建设项目(72202200205)。
关键词
锥属
壳斗科
中国新分布
Castanopsis
Fagaceae
new distribution in China
