Molecular evidence for natural hybridization between Rhododendron spiciferum and R. spinuliferum （Ericaceae）  

作　　者：Li-Jun YAN Lian-Ming GAO De-Zhu LI 

机构地区：[1]Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China [2]Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China [3]University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Journal of Systematics and Evolution》2013年第4期426-434,共9页植物分类学报（英文版）

摘　　要：Rhododendron x duclouxii is morphologically intermediate between Rhododendron spiciferum and Rhododendron spinuliferum, and was suspected to be a natural hybrid between these species. In this study, the nuclear ribosomal internal transcribed spacer （ITS） and chloroplast trnL-F regions of 34 accessions of R. x duclouxii and its putative parents were analyzed for evidence of hybridization. The results from molecular data supported by morphology demonstrated that R. ×duelouxii represents a natural hybrid between R. spiciferum and R. spinuliferum. It also implies that the hybridization between R. spiciferum and R. spinuliferum is bidirectional, and that populations of R. ×duclouxii represent hybrid swarms from backcrossing or selfing of F1 plants. The study is important for understanding the speciation processes in the genus since it demonstrates for the first time the existence of a natural homoploid hybrid in Rhododendron subgenus Rhododendron.Rhododendron x duclouxii is morphologically intermediate between Rhododendron spiciferum and Rhododendron spinuliferum, and was suspected to be a natural hybrid between these species. In this study, the nuclear ribosomal internal transcribed spacer （ITS） and chloroplast trnL-F regions of 34 accessions of R. x duclouxii and its putative parents were analyzed for evidence of hybridization. The results from molecular data supported by morphology demonstrated that R. ×duelouxii represents a natural hybrid between R. spiciferum and R. spinuliferum. It also implies that the hybridization between R. spiciferum and R. spinuliferum is bidirectional, and that populations of R. ×duclouxii represent hybrid swarms from backcrossing or selfing of F1 plants. The study is important for understanding the speciation processes in the genus since it demonstrates for the first time the existence of a natural homoploid hybrid in Rhododendron subgenus Rhododendron.

关 键 词：homoploid ITS natural hybridization R. xduclouxii R. spiciferum R. spinuliferum trnL-F. 

分 类 号：Q949.772.4[生物学—植物学] S835[农业科学—畜牧学]