Systematic position of a rare plant species Scaevola hainanensis based on ITS sequence analysis[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2016,55(1):16-23.
Systematic position of a rare plant species Scaevola hainanensis based on ITS sequence analysis[J]. Acta Scientiarum Naturalium Universitatis SunYatseni, 2016,55(1):16-23. DOI: 10.13471/j.cnki.acta.snus.2016.01.003.
Genetic diversity of Scaevola hainanensis Hance is estimated based on the sequences of nuclear ribosomal internal transcribed spacer region (ITS) from five populations distributed in China. Further
phylogenetic analysis of the S. hainanensis is performed based on combined ITS sequences data with other species of Scaevola and outgroups available from GenBank. The results shows that the genetic diversity of S. hainanensis is very low
implying that it is at risk of extinction at the genetic level as a rare plant. In the phylogenetic tree
S. hainanensis is located in the Northern Hemisphere lineage and closest to the clade consisting of local species in Hawaii with high support value
which imply the progenitor-derivative dispersal pattern of Scaevola species between Asia and Hawaii. The results did not support the monophyly of S. sect Scaevola and the hypothesis that S. hainanensis is derived from a widespread and sympatric species S. taccada is rejected based on the present result.