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. 2021 Aug 30;12:717200. doi: 10.3389/fgene.2021.717200

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Copyright © 2021 Tao, Chen, Kang, Liu and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Demographic history inferred by Stairway Plot for the six studied species of Cycas. The x axis indicates time before present in thousand years ago (kya) on a log scale, and the y axis represents the effective population size. The bold color curve and the light color shaded areas show the median estimate and 95% confidence interval, respectively, based on 200 bootstrapped sequences for each species. The light and dark gray shaded areas indicate the last glacial period (LGP) and the Last Glacial Maximum (LGM), respectively.