식물분류학회지 (Korean Journal of Plant Taxonomy)

  • 제52권2호
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  • Pages.102-107
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  • 2022
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  • 1225-8318(pISSN)
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  • 2466-1546(eISSN)
한국식물분류학회 (The Korean Society of Plant Taxonomists)
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A study of the chromosome number and genome size of the rare species Rhododendron keiskei var. hypoglaucum in Korea

  • CHOI, Bokyung (Department of Biological Science, College of Bioscience and Biotechnology, Chungnam National University) ;
  • KIM, Hyeonjin (Department of Biological Science, College of Bioscience and Biotechnology, Chungnam National University) ;
  • BYUN, Hye-Joo (Department of Biological Science, College of Bioscience and Biotechnology, Chungnam National University) ;
  • GANG, Geun-Hye (Plant Conservation Center, Korea National Park Research Institute) ;
  • LEE, Yongsoon (Department of Biology Education, Kongju National University) ;
  • MYEONG, Hyeon-Ho (Korea National Park Research Institute) ;
  • SO, Soonku (Plant Conservation Center, Korea National Park Research Institute) ;
  • JANG, Tae-Soo (Department of Biological Science, College of Bioscience and Biotechnology, Chungnam National University)
  • 투고 : 2022.06.03
  • 심사 : 2022.06.21
  • 발행 : 2022.06.30
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초록

Rhododendron keiskei var. hypoglaucum (Ericaceae) was recently reported in Korea, with a disjunct distribution on the southern islands of the Korean Peninsula. Although chromosome numbers and ploidy variations are important traits in angiosperms, gaining a clear understanding the cytological features of Rhododendron has been hampered by the small size of its chromosomes. We herein report the chromosome number, karyotype structure, and genome size of R. keiskei var. hypoglaucum for the first time. The chromosome number of the investigated plants was 2n = 26 with x = 13 as the base chromosome number, which is the one of the frequently encountered base chromosome numbers in Rhododendron. The karyotype of R. keiskei var. hypoglaucum is composed of metacentric and submetacentric chromosomes similar in length, which ranged from 1.39 to 2.40 ㎛. The DNA 1C-value in all examined accessions was small, ranging from 0.63 to 0.65 pg, further supporting the stable genome size in Rhododendron. These comprehensive cytological results provide a framework for detailed molecular, cytogenetic, and phylogenomic analyses that can be used to interpret the slow species diversification rate in Rhododendron.

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과제정보

The authors would like to thank Prof. Hanna WeissSchneeweiss and Dr. Eva M. Temsch (University of Vienna) for kindly providing the seeds of the reference standard used in genome size estimation. We are also very grateful for Soyun Won at Dadohaehaesang National Park of Korea for their kind help with field survey. This work was supported by grants from the Korean National Park Research Institute, grant number NPRI 2021-09.

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