摘要
通过对22种地图衣属地衣的23个形态学和解剖学特征分析为地图衣属地衣种间关系提供形态学依据。对22种地图衣属地衣的23个形态性状进行编码,以地图衣科的表衣属(Epilichen)与瘤衣属(Catolechia)代表种袖珍瘤衣(Catolechia wahlenbergii)和粗糙表衣(Epilichen scabrosos)作为外类群,利用PAUP对形态学特征矩阵进行最大简约法(MP)分析,同时与基于ITS序列的分子系统学结果进行比较分析。经简约分析,得到同等最大简约分支树,其严格一致树显示:地图衣属地衣根据子囊孢子的类型明显分为两支,分别由子囊孢子双胞型与子囊孢子砖壁型或亚砖壁型地图衣组成,其中,小地图衣与微地图衣,地图衣、淡黄色地图衣与大孢地图衣,蜥羽地图衣和绿孢地图衣分别聚在一个分支,研究结果与分子系统学研究结果大体一致。但是对一些物种的位置,分子系统发育结果和基于形态特征的系统发育树存在差异,从分支系统学结果可知,子囊孢子的类型是地图衣属重要的分类特征,可为地图衣属系统进化位置提供形态学的依据。
The aim of our study was to analyze morphological and anatomical characters of the 22 species belonging to the lichen genus Rhizocarpon,found in Xinjiang,China,to provide a morphological basis for the interspecific classification.Twenty-three morphological characters of 22 species of Rhizocarpon were coded.Catolechia wahlenbergii and Epilichen scabrosos,belonging to the genus Epilichen and Catolechia in the family Rhizocarponaceae,were designated as outgroup.Their morphological characteristic matrix was analyzed by Maximum Parsimony(MP)method using PAUP,compared with the results of molecular phylogeny based on ITS sequence.After parsimonious analysis,the equally most parsimonious cladograms were obtained,and its strict consensus tree showed that the species of genus Rhizocarpon were divided into two branches according to the type of ascospores,which were composed of species with 1-septate ascospores and the species with(sub-)muriform ascospores,respectively.R.parvum and R.pusillum,R.geographicum and R.atroflavescens as well as R.macrosporum,R.saurinum and R.furax were gathered in one branch of the phylogenetic trees,respectively.The results of this study were generally consistent with that of molecular phylogenetic analysis.The evolutionary position of some species based on the results of molecular phylogeny was different from that of the phylogenetic trees based on morphological characteristic.From the results of cladistic studies,the type of ascospores was an important taxonomic characters of the genus Rhizocarpon,and the present cladistic study would provide a morphological basis for the evolutionary position of the genus Rhizocarpon.
作者
古力娜·哈纳特
李作森
艾尼瓦尔·吐米尔
HANAT Gulina;LI Zuosen;TUMUR Anwar(College of Life Sciences and Technology,Xinjiang University,Urumqi 830046,China)
出处
《生物学杂志》
CAS
CSCD
北大核心
2021年第6期59-64,共6页
Journal of Biology
基金
国家自然科学基金项目(31660009)。
关键词
地图衣属
形态学特征
分支系统学
系统发育关系
Rhizocarpon
morphological characteristics
cladistic
phylogenetic relationships