JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2021, Vol. 45 ›› Issue (5): 47-52.doi: 10.12302/j.issn.1000-2006.202104027

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Study on ploidy and genome sizes of Osmanthus fragrans and its related species

DUAN Yifan1,2(), LI Lan1, YANG Xinxin1, WANG Xianrong1,2, ZHANG Min1,2, ZHANG Cheng1, CHAI Zihan1   

  1. 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, China
    2. Cangnan Forestry Bureau of Zhejiang Province, Cangnan 325800,China
  • Received:2021-04-18 Accepted:2021-06-10 Online:2021-09-30 Published:2021-09-30

Abstract:

【Objective】 This study aimed to provide new cytological evidence for the classification of Osmanthus fragrans and its related species (O. fortunei, O. heterophyllus and O. cooperi).【Method】 In this study, we used representative samples of Oryza sativa ‘Nipponbare’ to estimate the ploidy and genome sizes of 14 O. fragrans cultivars and three related species by using flow cytometry.【Result】 Average values of the O. fragrans Asiaticus Group, Luteus Group, Albus Group and Aurantiacus Group are 777.24, 760.85, 739.06 and 717.29 Mb, respectively. The largest genome size of the cultivar O. fragrans ‘Siji’ was 903.14 Mb. Genome sizes of O. cooperi and O. heterophyllus are 817.19 and 769.50 Mb, respectively; O. fortunei has the smallest genome size (729.11 Mb).【Conclusion】 Fourteen O. fragrans cultivars and three related species were diploid, but their genome sizes differed. The genome size of O. cooperi was close to that of O. fragrans ‘Xionghuang’, O. fragrans ‘Jinqiu’ and O. fragrans ‘Yuntian Cai.’ These results indicated a close relationship between O. cooperi and O. fragrans.

Key words: Osmanthus fragrans, close relationship, flow cytometry, ploidy identification, genome size

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