Abstract：
Chromosome numbers have been used in plant taxonomy, and they are still fundamental for taxon delimitation and genome evolution studies. South America is one of the most diverse continents in terms of plant species and there is a considerable number of species not yet analyzed. Accumulated knowledge about plant chromosome numbers has been compiled from online databases, and here we present an overview. The CCDB is one of the largest plant cytological databases and includes data for around 18% of known vascular plants in the world. In this work, we review the information contained in CCDB and in three databases with exclusive information for South America. At present, the three existing databases comprise information on around 1800 plant taxa related to specific regions, countries, or biomes. Efforts are necessary to expand cytological knowledge and to collect all the available information in a plant chromosome database for this continent.
摘要：
染色体数已用于植物分类学，它们仍然是分类单元定界和基因组进化研究的基础。就植物物种而言，南美是最多样化的大陆之一，并且有相当多的物种尚未分析。关于植物染色体数量的积累知识已从在线数据库中编译，在这里，我们提出一个概述。CCDB是最大的植物细胞学数据库之一，包括世界上大约18％的已知维管植物的数据。在这项工作中,我们审查了CCDB和三个包含南美独家信息的数据库中包含的信息.目前,现有的三个数据库包含与特定区域相关的大约1800个植物分类单元的信息，国家,或生物群落。必须努力扩大细胞学知识，并在该大陆的植物染色体数据库中收集所有可用信息。
