Phylogeography of Iris loczyi (Iridaceae) in Qinghai–Tibet Plateau revealed by chloroplast DNA and microsatellite markers. Issue 6 (1st November 2021)

• Record Type: Journal Article
• Authors: Zhang, Guoli; Han, Yan; Wang, Huan; Wang, Ziyang; Xiao, Hongxing; Sun, Mingzhou
• Editors: Brennan, Adrian
• Is Part Of: AoB plants. Volume 13:Issue 6(2021)
• Publication Date: 2021-11-01
• Subjects: Genetic diversity -- Iris loczyi -- population structure -- Qinghai–Tibet Plateau -- refuge; Plants -- Periodicals; Botany -- Periodicals; 580.5
• DOI: 10.1093/aobpla/plab070
• Languages: English
• ISSNs: 2041-2851

Abstract

Abstract: Quaternary climate oscillations and complex topography have tremendous effects on current distribution and genetic structure of species, and hence the Qinghai–Tibet Plateau (QTP), the largest plateau in the world, has become a hotspot for many phylogeographic studies. However, little is known about the phylogeographic pattern of herbaceous plants in QTP. Here, we investigate the genetic diversity, population structure and historical dynamics of Iris loczyi, using five chloroplast DNA (cpDNA) fragments and seven microsatellite markers. A total of 15 populations, and 149 individuals were sampled throughout the QTP. High genetic diversity was detected both in cpDNA ( H d = 0.820) and SSR ( H o = 0.689, H e = 0.699). Ten cpDNA haplotypes and 163 alleles were identified. AMOVA and clustering analyses revealed obvious differentiation between regions. The N st, G st and Mantel test showed significant phylogeographic structure of I. loczyi . The neutrality test and mismatch distribution analyses indicated that I. loczyi could not have undergone a historical population expansion, but population XS from the Qilian Mountain area could have experienced a local expansion. Bottleneck analyses indicated that I. loczyi had not experienced bottleneck recently. Based on cpDNA and SSR results, the Qilian Mountain area was inferred as a potential glacial refuge, and the southern Tibet valley was considered as a 'microrefugia' for I. loczyi . These findings provided new insights into the location of glacial refuges for the species distributed in QTP, and supplemented more plant species data for the response of QTP species to the Quaternary climate. Abstract : As the largest plateau in the world, the Qinghai–Tibet Plateau (QTP) is a hotspot for manyphylogeographic studies, but little is known about herbaceous plants. Here, we revealed the population genetic structure and two possible refuges of Iris loczyi distributed in QTP based on chloroplast DNA and microsatellite markers. The geographic isolation caused by multiple mountain ranges was contributed to the current distribution pattern of this species. Our findings provided new insights into the location of glacial refuges for the species distributed in QTP, and supplemented more species data for the response of QTP species to the Quaternary climate.