Nephopteris out of the clouds: Molecular evidence places the enigmatic N. maxonii (Pteridaceae) within the Jamesonia clade

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• 作者：Natalia Pabón-Mora ; Favio González
• 刊名：Brittonia
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：68
• 期：1
• 页码：83-92
• 全文大小：6,739 KB
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• 作者单位：Natalia Pabón-Mora (1)
  Favio González (2)
  
  1. Instituto de Biología, Universidad de Antioquia, AA 1224, Medellín, Colombia
  2. Universidad Nacional de Colombia, Facultad de Ciencias, Instituto de Ciencias Naturales, AA 7495, Sede Bogotá, Colombia
  
• 刊物主题：Plant Sciences; Plant Systematics/Taxonomy/Biogeography; Plant Anatomy/Development; Plant Physiology; Plant Ecology;
• 出版者：Springer US
• ISSN：1938-436X

文摘

The monospecific fern genus Nephopteris is restricted to four páramos in Colombia. Until now, its phylogenetic relationships have not been clarified, although morphological traits suggest that it belongs to the taenitidoid clade of the subfamily Pteridoideae in the Pteridaceae. We isolated four chloroplast (atpA, chlL, rbcL, and rps4) loci of N. maxonii and performed maximum parsimony and maximum likelihood phylogenetic analyses, including a preliminary analysis based on rbcL of 424 accessions of leptosporangiate ferns. Then, we carried out separate and combined reconstructions for all four loci, focusing the sampling in the subfamily Pteridoideae (Pteridaceae). Our results show that Nephopteris belongs to the taenitidoid clade of the subfamily Pteridoideae and is nested in Jamesonia. Thus, the new combination Jamesonia maxonii is provided. Its dimorphic sterile and fertile leaves appear to be unique within the taenitidoids. Given that this species shares the same microhabitat with other Jamesonia species, it is unlikely that leaf shape evolution within the entire clade is a result of adaptive processes to páramo conditions.