Diversification and vicariance of desert plants: Evidence inferred from chloroplast DNA sequence variation of Lagochilus ilicifolius (Lamiaceae)
2014
Gao, Xiao-Yang | Meng, Hong-Hu | Zhang, Ming-Li
To document arid Northern China as a diversification center for desert plants, and to better understand the mechanisms of desert taxa diversification, we used five cpDNA spacers (trnL-trnF, rps16, psbA-trnH, psbK-psbI and trnS-trnG) to investigate Lagochilus ilicifolius in all distribution areas, including Northern China, Mongolia and Russia. Phylogenetic analyses showed that L. ilicifolius comprises two distinctive lineages, one distributed in China, and another in Mongolia–Russia. Our data confirmed that arid Northern China, is a distinctive area with many endemic genera. Biogeographic inferences, based on a Bayesian uncorrelated lognormal model together with molecular dating, suggested that the main diversification within the species occurred in the Pleistocene (ca. 1.38–0.3 Ma), resulting from the transition of the climate of Eurasia to a dry-cold pattern as well as the desertification caused the vicariance of desert plants.
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