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Karyomorphological Study of Taraxacum in Northeast China

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Karyomorphological Study of Taraxacum in Northeast China Karyomorphological Study of Taraxacum in Northeast China Jie Wu ( [email protected] ) Jinzhou Medical University Xing Yanping Liaoning University of Traditional Chinese Medicine Chen Haotao Shenyang Pharmaceutical University Liu Qun Zhejiang Chinese Medical University Li Ran Yan'an University Li Jing Jinzhou Medical University Ning Wei Shenyang Aerospace University Cao Wei Chinese Academy of Sciences Research Keywords: dandelions, cluster analysis, chromosome number, cytology, germplasm resource Posted Date: June 29th, 2020 DOI: https://doi.org/10.21203/rs.3.rs-37774/v1 License: This work is licensed under a Creative Commons Attribution 4.0 International License. Read Full License Page 1/20 Abstract Background: Dandelions ( Taraxacum ) comprise more than 2,000 species distributed worldwide, including 70 species in China and over 20 species in Northeast China. It is an edible plant used also in traditional Chinese medicine. Methods: Chromosome number was determined by conventional tableting, and karyotypes were analyzed. We determined the number of mitotic chromosomes, karyotype characteristics, and morphology of Taraxacum germplasm resources collected in Northeast China. The data were compared with those in the Chromosome Counts Database (CCDB) using principal component analysis (PCA) and cluster analysis. Results: The collected Taraxacum species included diploids, triploids, and tetraploids, with chromosome numbers of 2n = 16, 24, and 32, respectively. The karyotypes showed metacentric and submetacentric chromosomes and satellites. The absolute length of a single chromosome was 3.56– 31.68 μm, and the karyotype asymmetry coecient was 59.68%–67.45%. PCA of karyotype data showed that chromosome size, long arm length, and short arm length formed PC1. Cluster analysis based on karyotype data of the 18 species supported the taxonomic classication of this genus in the Flora of China . Conclusions: Our results indicate that karyotype analysis can be used as cytological evidence for Taraxacum taxonomy. We also determined that among the 18 Taraxacum species, triploid species were more evolved than diploid and tetraploid species. We believe that our results provide a basis for further research in Taraxacum germplasm resources and lay the experimental foundation for further development of Taraxacum in traditional Chinese medicine. Background Dandelions, Taraxacum F.H. Wigg. (family Compositae), are one of the most evolved taxa in the subfamily Liguliorae DC. Taraxacum plants have a unique mode of reproduction—they can reproduce both asexually (apomixis) and sexually. The Flora of China reports that many Taraxacum species often form new populations by apomixis or natural hybridization [1,2]. However, there is no gene exchange among these apomictic individuals, and therefore, it is dicult to determine the biological species and establish the species boundaries. Consequently, classication and identication of Taraxacum resources based on morphological characteristics have always been challenging and their taxonomic identication controversial. The Herbaceous Flora of Northeast China recognizes 19 species, 1 variety, and 3 forms in the genus Taraxacum present in Northeast China, whereas the Flora of China records 11 species of Taraxacum in the same region [3]. The substantial differences in the types of germplasm resources recorded in the two authoritative botanical texts highlight the need for standardization of botanical texts. The northeast region of Chine where Taraxacum is commonly found is also one of the main supply bases for the Chinese medicine market. Therefore, in this study, we sampled plant populations from this region for the taxonomic identication of Taraxacum plants. The chromosome is the principal component and genetic material of the cell nucleus. Chromosome number is typical for each species, and it remains relatively stable between generations and between individual cells (except the endosperm). Therefore, the chromosome number can be used as a taxonomic character for species delimitation [4]. Plant karyotype analysis is used to study the variation patterns of plants and further explore the genetic relationships and evolutionary trends among various populations. Aquaro et al. [5,6] compared the morphology of four systematic units of Taraxacum from Italy and, in combination with genomic studies, identied four species, two of which were new to science. Their chromosome numbers and karyotype formulae, which were provided for the Taraxacum germplasm resources, laid a foundation for the further development and utilization of these four Taraxacum species. Verhoeven et al. reported the interference effects of geographical parthenogenesis in T. ocinale W.H. Wigg. on the spread of invasive plants and determined the mode of parthenogenesis in Taraxacum [7]. Mitsuyuki et al. reported that hybridization of the native diploid Japanese T. platycarpum Dahlst. with European triploid species T. ocinale and T. laevigatum DC. produced triploid plants capable of sexual reproduction [8]. Musiał analyzed the ovule development process in T. udum Jord. (sect. Palustria), a species from Poland, and identied three modes of reproduction, namely, apomixis, Page 2/20 parthenogenesis, and autonomous endosperm formation [9]. These complex reproduction patterns further complicate the classication and identication of Taraxacum germplasm resources. In this study, we conducted nearly 10-year-long eld investigations in Northeast China and identied 18 Taraxacum germplasms. Karyotype analysis of seven of those Taraxacum species was previously published [10], whereas the karyotype of the remaining 11 species is analyzed here for the rst time. Furthermore, we performed karyotype cluster analysis of the 18 species distributed in Northeast China and elucidated their phylogenetic relationships and evolutionary trends, thereby laying an experimental foundation for further identication of Taraxacum germplasm resources in Northeast China. This study will also provide a basis for further development of Taraxacum resources and the rational use of this genus in traditional Chinese medicine. Methods Plant material The test material included 18 Taraxacum species distributed in Northeast China (including seven species previously reported by our laboratory). Taxonomic criteria were based on the Flora of China and Herbaceous Flora of Northeast China. All collected specimens were identified by Jiyun Li of the Shenyang Institute of Applied Ecology, Chinese Academy of Sciences, and deposited in the Experimental Station of Jinzhou Medical University. Taraxacum resources were collected from Heilongjiang, Jilin, Liaoning, and other provinces from 2008 to 2019 and planted in the Experimental Base of Jinzhou Medical University following routine management protocols. Voucher information of sampled materials is provided in Table 1 and Figure1. Table.1. Collection locations of 18 Taraxacum species in Northeast China No. Species nam Voucher A T. antungense Kitag Dandong City, Liaoning Province X.Zhao 011(SYAB) B T. asiaticum Dahlst Panshi City, Jilin Province X.Zhao 043(SYAB) C T. urbanum Kitag. Chaoyang City, Liaoning Province B.Zhang 047(SYAB) D T. ohwianum Kitag. Dandong City, Liaoning Province B.Zhang 023(SYAB) E T. variegatum Kitag. Dandong City, Liaoning Province X.Zhao 034(SYAB) F T. asiaticum var.lonchophyllum Kitag. Chaoyang City, Liaoning Province X.Zhao 029(SYAB) G T. junpeianum Kitam. In Act. Dandong City, Liaoning Province X.Zhao 014(SYAB) H T. mongolicum Hand. -Mazz. Dandong City, Liaoning Province X.Zhao 014(SYAB) I T. liaotungense Kitag. Songyuan City, Jilin province J.Wu 010(JZKY) J T.coreanum Nakai Shenyang City, Liaoning province J.Wu 005(JZKY) K T.formosanum Kitam. Tongliao City, Neimengu province J.Wu 009(JZKY) L T. sinomongolicum Kitag. Dandong City, Liaoning Province J.Wu 012(JZKY) M T.heterolepis Nakai et Koidz.ex Kitag. Panshi City, Jilin Province J.Wu 013(JZKY) N T.brassicae folium Kitag. Chaoyang City, Liaoning Province J.Wu 014(JZKY) O T.platypecidum Diels Dandong City, Liaoning Province J.Wu 015(JZKY) P T. falcilobum Kitag. Dandong City, Liaoning Province J.Wu 016(JZKY) Q T.borealisinense Kitam. Chaoyang City, Liaoning Province J.Wu 017(JZKY) R T.erythopodium Kitag. Dandong City, Liaoning Province J.Wu 018(JZKY) Resource: investigated on location by authors. Methods The achenes were germinated and cultivated using hydroponics to generate root tips. Ten representative achenes of each species were evenly placed in a glass culture dish with a diameter of 90 mm; 5–10 culture dishes were used for each species. Appropriate volumes of water were added to partially soak the achenes, and the culture dishes with filter paper were incubated at 23 °C to germinate the seeds. Root tips were collected when the primary roots reached 0.5–1.5 cm length. Samples were prepared by the crushing method for observation of chromosome characteristics. Specifically, the samples were treated with 0.0038 mol·L-1 8-hydroxyquinoline for 4–5 h and then fixed in Carnoy’s solution I (anhydrous ethanol and glacial acetic acid Page 3/20 mixed in a volume ratio of 3:1). After fixing at 4 ℃ for 12 h, the samples were washed with 70% ethanol solution and stored in 70% ethanol solution at 4 ℃. The fixed root tips were dissociated in 1 mol·L-1 hydrochloric acid for 15 min in a thermostatic water bath at 60 ℃, stained with basic fuchsin, crushed, and observed, as well as photographed using a Moficam 2206 (Olympus, Japan) microscope. Permanently mounted slides were prepared. At least 30 cells
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