Chromosome counts and karyotype analysis of nine taxa in Sorbus subgenera Aria and Micromeles (Rosaceae) from China

Authors

  • Yuming Qian Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037 https://orcid.org/0000-0002-7393-5099
  • Kailin Zhu Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037 https://orcid.org/0000-0003-0020-7207
  • Chenqian Tang Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037
  • Zhixin Qiu Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037
  • Xin Chen Co-Innovation Center for Sustainable Forestry in Southern China, College of Biology and the Environment, Nanjing Forestry University, Nanjing 210037 https://orcid.org/0000-0003-2315-083X

DOI:

https://doi.org/10.36253/caryologia-1387

Keywords:

chromosome number, karyotype asymmetry, Sorbus, subgenera Aria and Micromeles, China

Abstract

Chromosome numbers of nine taxa in Sorbus subgenera Aria (Pers.) Host and Micromeles Decne. were determined. All are diploid with 2n = 2x = 34. Eight out of them: S. alnifolia (Siebold and Zucc.) K. Koch var. angulata S.B. Liang Rehd., S. alnifolia (Siebold and Zucc.) K. Koch var. lobulata (C.K. Schneid.) Rehd., S. dunnii Rehd., S. folgneri (C.K. Schneid.) Rehd., S. hemsleyi (C.K. Schneid.) Rehd., S. lushanensis X. Chen & J. Qiu, S. ochracea (Hand.-Mazz.) J.E. Vidal and S. yuana Spongberg, which are endemic to China, were reported for the first time. One remaining Asian native S. alnifolia var. alnifolia (Siebold and Zucc.) K. Koch, 2n = 34 was confirmed here. The chromosomes size and the total haploid chromosome length varied from 0.91 µm to 3.51 µm and 23.43 μm to 50.04 μm respectively. A predominance of metacentric chromosomes were perceived. Satellites were observed only in taxa of subgenera Micromeles. Nine taxa were classified as 1A, 2A and 2B according to the Stebbins classification. S. yuana in subgenus Aria presents the most symmetrical karyotype according to all the 11 quantitative indices analyzed, while S. dunnii and S. ochracea in Micromeles present the most asymmetrical karyotypes according to different indices. 

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Published

2022-07-07

How to Cite

Qian, Y., Zhu, K., Tang, C., Qiu, Z., & Chen, X. (2022). Chromosome counts and karyotype analysis of nine taxa in Sorbus subgenera Aria and Micromeles (Rosaceae) from China. Caryologia, 75(1), 123-130. https://doi.org/10.36253/caryologia-1387

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