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Cytological study on the genus Syncalathium （Asteraceae-Lactuceae）, an endemic taxon to alpine scree of the Sino-Himalayas

ISSN号：1674-4918
期刊名称：《植物分类学报：英文版》
时间：0
分类：Q949.783.5[生物学—植物学] S511.101[农业科学—作物学]
作者机构：[1]Key Laboratory of Biodiversity and Biogeography, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650204, China, [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China
相关基金：Acknowledgements This study was supported by grants-in-aid from the National Natural Science Foundation of China （NSFC 30625004, 40771073 to H SUN, and 30770167 to Z-L NIE）, the Yunnan Natural Science Foundation （2008CC013 to H SUN）, and the National Science Foundation （DEB-0321846 to DE BOUFFORD）. The first author is indebted to SL KELLEY of Harvard University Herbaria for providing in-formation, Dr. Tie-Yao TU and Mr. Wei-Dong ZHU of the Kunming Institute of Botany for help during field trips.

作者： Jian-Wen ZHANG[1,2], Ze-Long NIE[1], Hang SUN[1]

关键词：细胞学特征, 喜马拉雅山, 菊科, 碎石, 高寒, 喜马拉雅地区, 染色体数目, 调查报告, Asteraceae, chromosome numbers, diploidy, karyotype, Syncalathium.

中文摘要：

在 Syncalathium 的四种的抽象 Cytological 人物(Asteraceae：Lactuceae ) ，有对中国喜玛拉雅的区域的高山的卵石地方性的六识别的种的一个小类，在这份报告被调查。三种(Syncalathium pilosum， Syncalathium chrysocephalum，和 Syncalathium disciforme ) 第一次被检验。与我们的以前的计数结合了，五种 cytologically 从类被调查了，结果显示所有种类与 x=8 的基本体的染色体数字是双的。Syncalathium souliei 的 karyotype 不对称现象是 2A，从 1A，和留下的种类的另外的四种不同与不同 karyotypes 被划分成二亚群，与他们的词法特征一致。Syncalathium 的 cytological 进化的意义简短被讨论。

英文摘要：

Cytological characters of four species in Syncalathium （Asteraceae： Lactuceae）, a small genus with six identified species endemic to alpine scree of the Sino-Himalayan region, are surveyed in this report. Three species （Syncalathiumpilosum, Syncalathium chrysocephalum, and Syncalathium disciforme） are examined for the first time. Combined with our previous counts, five species have been cytologically investigated from the genus and the results indicated that all species are diploid with the basic somatic chromosome number of x=8. The karyotype asymmetry of Syncalathium souliei is 2A, distinct from the other four species of 1A, and the remaining species are divided into two subgroups with different karyotypes, consistent with their morphological features. The significance of the cytological evolution of Syncalathium is briefly discussed.

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