文献类型： 外文期刊
第一作者： Sun, Jianying
作者： Sun, Jianying;Zhang, Qian;Xu, Meiling;Liu, Xingyu;Sun, Jian;Li, Zongyun;Han, Yonghua;Yan, Mengxiao;Wang, Hongxia;Yang, Jun;Cao, Qinghe
作者机构：
关键词： Sweetpotato; Karyotype; Karyological relationship; Oligo-FISH; rDNA
期刊名称：CHROMOSOME RESEARCH （ 影响因子：2.8； 五年影响因子：2.8 ）
ISSN： 0967-3849
年卷期： 2024 年 32 卷 4 期
页码：
收录情况： SCI
摘要： The origin of hexaploid sweetpotato [Ipomoea batatas (L.) Lam.] remains controversial. Comparative karyotype analysis is particularly useful in determining species relationships and the origin of polyploid species. In previous study, we developed a set of oligo probes and identified all chromosomes of Ipomoea nil, a model diploid Ipomoea species. Here, we found that this set of oligo probes could be used to identify all chromosomes of sweetpotato and its wild relatives with different ploidy. Karyotypes based on individually identified chromosomes were established and the number and position of 5S and 35S rDNA loci were determined for these Ipomoea species. Comparison of their karyotypes revealed distinct variations in the karyotypic parameters. Karyological relationships among these species were revealed by principal coordinate analysis (PCoA) based on six quantitative parameters (x, 2n, TCL, MCA, CVCL and CVCI). These results show that I. trifida is the most closely related diploid species to sweetpotato, and other diploid species could be excluded from consideration as its possible diploid ancestor. In addition, our study also provides cytogenetic evidence for the segmental allopolyploid hypothesis of sweetpotato origin.
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