Chromosome numbers and karyotypes of 18 species of Epimedium sect. Diphyllon (Berberidaceae) from central China

Chromosome numbers and karyotypes of 18 species of Epimedium sect. Diphyllon (Berberidaceae) from central China
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淫羊藿科18种植物的染色体数目及核型。

DOI:
10.1080/00087114.2018.1499482
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发表时间:
2018-10
期刊:
影响因子:
2.1
通讯作者:
Meng Ying
Meng Ying
中科院分区:
生物学4区
文献类型:
--
作者:
Zhang Cheng;Peng Zhi-Bang;Nie Ze-Long;Zhang Dai-Gui;Li Ke-Gang;Meng Ying

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摘要淫羊藿属是小檗科最大、最重要的草本植物属之一,尤其是双叶淫羊藿组,在我国中部地区是一个多样化中心。对淫羊藿属18个种的24份材料进行了染色体数目和核形态学研究,其中5种为首次报道。染色体数目均为2n = 2x = 12,除E. acuminatum、尖叶艾美耳球虫E. brevicornu、短角真杆菌E. ilicifolium和E. leptorrhizum为3A.它们的不对称指数(AI)值从1.71到4.56不等。星际卫星通常在第一对或第二对上发现。对两个以上的个体进行了E. franchetii、E. leptorrhizum、E. stellulatum和E.武山鹅掌楸的核型公式、Stebbins不对称性和AI值等细胞学性状一致且稳定,但E.瘦根草并对淫羊藿细胞学研究的意义和局限性进行了简要讨论。
ABSTRACT Epimedium is the largest and one of the most important herbaceous genera in Berberidiaceae, especially for section Diphyllon, which has a diversification center in central China. Chromosome numbers and karyomorphology of 24 accessions were examined, representing 18 Epimedium species, five of which were counted here for the first time. A chromosome number of 2n = 2x = 12 was observed for all taxa and all karyotypes were Stebbins’ 2A, except for E. acuminatum, E. brevicornu, E. ilicifolium and one accession of E. leptorrhizum, which were 3A. Their asymmetry index (AI) values vary from 1.71 to 4.56. Intercalary satellites are commonly found on the first or second pair. More than two individuals were sampled for E. franchetii, E. leptorrhizum, E. stellulatum, and E. wushanense and all had consistent and stable cytological traits with respect to their karyotype formula, Stebbins’ asymmetry, and AI values, except for E. leptorrhizum. The significance and limits of the cytological results for Epimedium are also briefly discussed.
DOI: --
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