摘要
为探讨缺齿藓类与真藓科、提灯藓科的系统关系,理清缺齿藓科的系统位置和中国缺齿藓科分类问题,该研究以中国分布的缺齿藓科植物和相关类群4 000余份标本为材料,进行详细的形态学研究,并选用其中35种、40份样品的4个DNA片段(rps4、trnG、trnL-trnF、atpB-rbcL)联合数据用于分子系统分析,采用邻接法(NJ)和最大似然法(ML)构建分子树。结果表明:(1)在分子树中,缺齿藓类与真藓科植物分别聚在具有高支持率的不同分支上,叶形、叶细胞等形态学特征也有较大差异,缺齿藓类应从广义的真藓科分出。(2)在分子树中,虽然缺齿藓类与提灯藓科植物聚在同一分支中,但无形态学的共源性状,二者不应视为一个单系类群。(3)缺齿藓科是一个自然类群,缺齿藓科内属间存在着密切的系统关系,缺齿藓科的主要识别特征为:植物体小型,茎常分枝;叶形和叶细胞为丝瓜藓型(Pohlia-like),披针形至长椭圆形,中上部细胞狭长,线状菱形或蠕虫形;生殖苞多生于新生枝顶;蒴齿为互生双齿层,常有不同程度的退化或一层蒴齿缺失,稀双层蒴齿缺失。(4)中国缺齿藓科包含有5属,即缺齿藓属(Mielichhoferia)、丝瓜藓属(Pohlia)、拟丝瓜藓属(Pseudopohlia)、合齿藓属(Synthetodontium)和小叶藓属(Epipterygium),目前为止共计34种(含种下分类单位)。
The paper aims to discuss the relationship between Mielichhoferiagroup and Bryaceae ,to identi-fy morphological synapomorphy between Mielichhoferiagroup and Mniaceae ,to solve the problem of sys-tematic position of Mielichhoferia group ,to figure out the classification of Mielichhoferiaceae in China . Morphological characters of more than 4 000 specimens of Mielichhoferiaceae and its related groups in Chi-na were analyzed .And then ,neighbor joining （NJ） and maximum likelihood （ML） tree were built based on combined trnG , rps4 , trnL-trnF ,and atpB-rbcL cpDNA sequences of 40 specimens for 35 species . Combining morphological and molecular data in the analyses showed that ：（1） not only were Mielichho f e-ria group and Bryaceae family in the different clades in the molecular tree ,but also morphological features , such as the leaf shape ,the leaf cells of the two groups were different .Mielichho f eria group should be sep-arated from Bryaceae .（2） No morphological synapomorphy can be detected for Mielichho f eria group and Mniaceae family ,although they were in the same clade in the molecular tree .The two groups were not monophyletic .（3） Mielichhoferiaceae is a natural monophyletic group .In Mielichhoferiaceae ,the plants are small ,stems tend to be much branched than in Bryaceae ;leaves are Pohlia-like in shape and areola-tion;gametangia are often produced on lateral branches or the base of stems ;peristome is diplolepideous-alternate ,often reduced to one layer or rarely absent .（4） There are five genera ,Mielichhoferia ,Pohlia , Pseudopohlia ,Synthetodontium and Epipterygium ,in Mielichhoferiaceae in China ,total 32 species and 2 variaties .
作者
刘永英
牛玉璐
曹珍
赵建成
LIU Yongying NIU Yulu CAO Zhen ZHAO Jiancheng(Department of Biology, Jiaozuo Teachers College, Jiaozuo, He＇nan 454001, China College of Life Science, Hebei Normal University, Shijiaahuang 050024, China College of Life Science, Hengshui University, Hengshui, Hebei 053000, China)
出处
《西北植物学报》
CAS
CSCD
北大核心
2016年第7期1366-1375,共10页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家自然科学基金(31370237)
河南省自然科学基金(152300410176)
河北省自然科学基金(C2016111016)
河南省高等学校重点科研项目(15B180007)
关键词
缺齿藓科
真藓科
提灯藓科
形态性状
分子树
分类
Mielichhoferiaceae
Bryaceae
Mniaceae
morphological characters
molecular tree
classification
