2024年7月21日 星期日
基于叶柄基部鳞片形态特征分析大膜盖蕨属的系统位置
Analysis on the systematic position of Leucostegia C. Presl based on the morphological characteristics of stipe base scales
2022年 第31卷 第1期 页码[1-6]    下载全文[10.3MB]  
摘要

采用荧光显微镜对肿足蕨科(Hypodematiaceae)大膜盖蕨属(Leucostegia C. Presl)的大膜盖蕨(L. immersa C. Presl)、肿足蕨属(Hypodematium Kunze)的鳞毛肿足蕨(H. squamulosopilosum Ching)和球腺肿足蕨〔H. glanduloso-pilosum (Tagawa) Ohwi〕以及骨碎补科(Davalliaceae)7种植物叶柄基部鳞片的形态特征进行了观察和比较;并对上述10个种类以及宿蹄盖蕨(Athyrium anisopterum Christ)和耳羽岩蕨(Woodsia polystichoides Eaton)2个外类群进行了支序分析。结果显示:大膜盖蕨属和肿足蕨属植物叶柄基部鳞片均为基部着生,而骨碎补科植物叶柄基部的鳞片为盾状或假盾状着生。肿足蕨科和骨碎补科植物的鳞片邻接细胞壁特点和鳞片边缘突起物类型方面存在差异,大膜盖蕨属和肿足蕨属植物的鳞片邻接细胞壁为直边,鳞片边缘突起物均为由单细胞或单列细胞组成的毛;而骨碎补科植物的鳞片邻接细胞壁为曲边,鳞片边缘多为由两相邻细胞组成的齿状刺,或为啮蚀状。支序分析结果显示:大膜盖蕨属和肿足蕨属植物聚为一支,而骨碎补科植物聚为另一支。本文结果支持大膜盖蕨属和肿足蕨属具有较近的亲缘关系,支持大膜盖蕨属归于肿足蕨科,与分子系统学的研究结果一致。

 

Abstract

 The morphological characteristics of stipe base scales of Leucostegia immersa C. Presl in Leucostegia C. Presl and Hypodematium squamulosopilosum Ching and H. glanduloso-pilosum (Tagawa) Ohwi in Hypodematium Kunze (Hypodematiaceae) and seven species in Davalliaceae were observed and compared by using fluorescence microscope; the cladistic analysis on the ten species mentioned above as well as two outgroups namely Athyrium anisopterum Christ and Woodsia polystichoides Eaton was carried out. The results show that the stipe base scales of species in Leucostegia and Hypodematium are basifixed, whereas those of species in Davalliaceae are peltated or pseudopeltated. There are differences in characteristics of scale adjacent cell walls and types of scale margin protrusions of stipe base scales between Davalliaceae and Hypodematiaceae, the scale adjacent cell walls of species in Leucostegia and Hypodematium are straight, and their scale margin protrusions are composed of unicellular or uniseriate cell hairs; while those of species in Davalliaceae are undulate, and their scale margin protrusions are mostly composed of denticulate spines constituted by two adjacent cells or erose. The result of cladistic analysis shows that the species in Leucostegia and Hypodematium are clustered into one clade, while the species in Davalliaceae are clustered into the other clade. The results of this study support that the genetic relationship between Leucostegia and Hypodematium is close, and support that Leucostegia belongs to Hypodematiaceae, which is consistent with the results of molecular systematics.

关键词大膜盖蕨属; 鳞片; 系统位置; 肿足蕨科; 骨碎补科
Key wordsLeucostegia C. Presl; scale; systematic position; Hypodematiaceae; Davalliaceae
作者苗馨元1,2,3, 李春香1,2
所在单位1. 中国科学院南京地质古生物研究所 现代古生物学和地层学国家重点实验室, 江苏 南京 210008;2. 中国科学院生物演化与环境卓越创新中心, 江苏 南京 210008; 3. 中国科学院大学, 北京100049
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基金项目中国科学院战略性先导科技专项(B类)(XDB26000000); 中国科学院基础前沿科学研究计划(ZDBS-LY-DQC021)