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Genetic Resources and Crop Evolution

, Volume 64, Issue 6, pp 1451–1463 | Cite as

Genome size estimations in Chrysanthemum and correlations with molecular phylogenies

  • Chang Luo
  • Dongliang Chen
  • Xi Cheng
  • Huien Zhao
  • Conglin HuangEmail author
Research Article

Abstract

A wide range of ploidy variation exists among native Chinese Chrysanthemum germplasm. This study examined the evolution of genome size, Cx value, and chromosome number in Chinese Chrysanthemum within a phylogenetic context. The genome size of 15 species belonging to Chrysanthemum and three related genera was determined using flow cytometry. Nuclear ribosomal ITS and chloroplast trnL-F intergenic spacer sequence were used to construct molecular phylogenetic trees. Genome size values among the 15 species divide into three discrete groups, which positively correlate with three ploidy levels. We found significantly and negatively correlated 1Cx values to ploidy levels in all 15 species and a genome downsizing after polyploidization effect in Chrysanthemum. Two major phylogenetic clade, the C. indicum group and the C. zawadskii + Ajania group, possess significant differences in genome size and 1Cx values. The genome size and 1Cx values in the C. indicum group were significantly lower than in the C. zawadskii group, even though both have same ploidy level, and significant latitude and morphology correlations can be inferred. Diploid Chrysanthemum species similar in 1Cx values to C. indicum (Mt.Tianzhu) and C. indicum (Fujian) indicate that some populations of tetraploid C. indicum originated by autoploidy. We deduced that C. chanetii is a relatively young species, C. vestitum relative ancient and that the divergence between Chrysanthemum and Ajania may have been relatively recent, presumably the same divergence as created C. zawadskii.

Keywords

Ajania China Chrysanthemum Flow cytometry Genome size Phylogeny 

Notes

Acknowledgments

This research was mainly supported by The Project of Science and Technology of Beijing Academy of Agriculture and Forestry Sciences (KJCX20140109, KJCX20140202).

Compliance with ethical standards

Conflict of interest

The authors state no conflict of interests.

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Chang Luo
    • 1
  • Dongliang Chen
    • 1
  • Xi Cheng
    • 1
  • Huien Zhao
    • 2
  • Conglin Huang
    • 1
    Email author
  1. 1.Beijing Agro-Biotechnology Research Center, Beijing Academy of Agriculture and Forestry SciencesBeijing Municipal Key Laboratory of Agro-gene Resource and BiotechnologyBeijingPeople’s Republic of China
  2. 2.Department of Ornamental Horticulture, College of Landscape ArchitectureBeijing Forestry UniversityBeijingPeople’s Republic of China

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