Karyological studies on the Sino-Himalayan genus, Cremanthodium (Asteraceae: Senecioneae)
Karyological studies on the Sino-Himalayan genus, Cremanthodium (Asteraceae: Senecioneae)
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DOI：
10.1006/bojl.2000.0385
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发表时间：
2001-02-01
影响因子：
2.4
通讯作者：
Lu, AM
中科院分区：
文献类型：
--
作者：
Liu, JQ;Liu, SW;Lu, AM
对产于中国西部高海拔地区的7个种22个居群进行了核型观察。埃利希、小舌、布氏、狭舌、圆盘和线虫的染色体数目相同，分别为2n=58和2n=60。所有这些物种的染色体数目在这里是第一次被记录下来。基数x=30是该属的新记录。根据Stebbins的不对称核型分类，所有物种的核型均为2A型。在Cremanthodium中，两个基本染色体数目，x=30和x=29，完全对应于该属的两种分枝模式，合轴和单轴。合生种的系统分类地位有待进一步研究。核形态数据不支持木兰属的亚组划分。(C)2001年伦敦林尼安协会。
Twenty-two populations of seven species of Cremanthodium from high altitude regions of western China were observed karyologically. C. ellisii, C. microglossum, C. brunneo-pilosum, C. stenoglossum, C. discoideum and C. lineare all had the same chromosome number of 2n=58 whereas C. humile had 2n=60. All chromosome numbers of these species are documented here for the first time. The basic number of x=30 is new for this genus. The karyotypes of all species belong to 2A type according to Stebbins' asymmetry classification of karyotypes. Two basic chromosome numbers, x=30 and x=29 in Cremanthodium, correspond exactly to two branching patterns in this genus, sympodial versus monopodial. The systematic and taxonomic statuses of the sympodial species need further study. The karyomorphological data provide no support to the sectional subdivision in Cremanthodium. (C) 2001 The Linnean Society of London.