PJB-2024-140
Genetic structure and phylogeographic of Tulipa iliensis
Douwen Qin
Abstract
Tulipa iliensis is an important wild germplasm resource. Field investigations revealed differences in plant phenotypes of Tulipa iliensis across the altitudinal gradient, Xinjiang, China. To explore the spatial variation patterns of genetic diversity and genetic structure of different populations of Tulipa iliensis under different altitudinal gradients, this study sequenced and analyzed cpDNA fragments of 100 individuals of Tulipa iliensis distributed along seven altitudinal gradients. The distribution pattern based on cpDNA data showed that within the sampling area, the rbcLaF-rbcL fragment has 312 variable sites, yielding 6 haplotypes, among which Hap-1 and Hap-2 are ancient. The genetic diversity is rich and the variation mainly comes from within populations, but there is also some gene flow between populations. There is no apparent phylogeographic structure within the sampling area and no recent expansion has occurred, with the population size remaining stable. The wettest and driest monthly precipitation levels are key factors affecting the distribution of Tulipa iliensis in China. In the paleoclimates, current, and future climate scenarios, Tulipa iliensis suitability distribution range in China presents a shrinking trend and migrates to higher latitudes. This study lays a foundation for subsequent research on the history of Tulipa iliensis genealogy, adaptive traits, and analysis of stress response mechanisms.
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