Phylogenetic position of Kontumia （Polypodiaceae） inferred from four chloroplast DNA regions  

作　　者：Changkyun KIM Hong-Guang ZHA Tao DENG Hang SUN Su-Gong WU 

机构地区：[1]Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China

出　　处：《Journal of Systematics and Evolution》2013年第2期154-163,共10页植物分类学报（英文版）

基　　金：grants from the research program for Postdoctoral Scholar,Key Laboratory of Biodiversity and Biogeography,Kunming Institute of Botany,CAS (Grant No.Y0205111L1) to CK,West Light Foundation of the CAS to H-GZ,Hundred Talents Program of the Chinese Academy of Sciences，the National Natural Science Foundation of China (Grant No.31061160184) to HS,and the National Geographic Society of the United States (Grant Nos.6300-98 and 7312-13) to S-GW

摘　　要：The phylogenetic position of the monotypic genus Kontumia （Polypodiaceae） is contentious. It has been suggested that Kontumia is related to Gyrnnogrammitis dareiformis （Drynarioideae） based on spore ornamentation and blade dissection, or it has been assigned as a member ofmicrosoroid ferns （Microsoroideae） based on the shape of rhizome scales. In the present study, we determined the phylogenefic position of K. heterophylla using four chloroplast DNA regions （rbcL, atpB, rps4 ＋ rps4-trnS intergenic spacer JIGS], and trnL-F IGS）. A parsimony consensus tree indicated that K. heterophylla is not related to G. dareiformis, but is nested within the Leptochilus lineage of Microsoroideae. This relationship is also supported by sharing of clathrate scales on the rhizome, which is not found in G. dareiformis. Although marked morphological disparities are found between K. heterophylla and the Leptochilus lineage in terms of leaf dissection, fertile-sterile leaf differentiation, and sori arrangement, our results indicate that these characters have evolved independently several times in Polypodiaceae.The phylogenetic position of the monotypic genus Kontumia （Polypodiaceae） is contentious. It has been suggested that Kontumia is related to Gyrnnogrammitis dareiformis （Drynarioideae） based on spore ornamentation and blade dissection, or it has been assigned as a member ofmicrosoroid ferns （Microsoroideae） based on the shape of rhizome scales. In the present study, we determined the phylogenefic position of K. heterophylla using four chloroplast DNA regions （rbcL, atpB, rps4 ＋ rps4-trnS intergenic spacer JIGS], and trnL-F IGS）. A parsimony consensus tree indicated that K. heterophylla is not related to G. dareiformis, but is nested within the Leptochilus lineage of Microsoroideae. This relationship is also supported by sharing of clathrate scales on the rhizome, which is not found in G. dareiformis. Although marked morphological disparities are found between K. heterophylla and the Leptochilus lineage in terms of leaf dissection, fertile-sterile leaf differentiation, and sori arrangement, our results indicate that these characters have evolved independently several times in Polypodiaceae.

关 键 词：FERN Kontumia Leptochilus lineage Microsoroideae molecular phylogeny Polypodiaceae. 

分 类 号：S512.101[农业科学—作物学] Q949.36[生物学—植物学]