PHYLETIC HOT SPOTS FOR B CHROMOSOMES IN ANGIOSPERMS
PHYLETIC HOT SPOTS FOR B CHROMOSOMES IN ANGIOSPERMS
复制标题
被子植物中 B 染色体的类群热点
DOI：
10.1111/j.0014-3820.2005.tb01035.x
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发表时间：
2005
期刊：
影响因子：
4.4
通讯作者：
R. Trivers
中科院分区：
文献类型：
--
作者：
D. Levin;B. G. Palestis;R. N. Jones;R. Trivers
摘要我们确定了多余的B染色体是否在主要被子植物谱系和科内谱系之间非随机分布，以及具有异常高B染色体频率的谱系(热点)的同一性。每个分类单元的B染色体的发生率是从数据库中收集的，这些数据库显示了有和没有这些染色体的物种(在已知染色体数目的物种中)。在物种水平以上的所有级别上都存在异质性。约8%的单子叶植物具有B染色体，而真子叶植物为3%；在非单子叶植物基生被子植物中，B染色体很少见。B染色体频率在近缘目、目内科和科内主要类群之间存在显著的异质性。B染色体有多个热点，包括百合目和蒲公科。在家族水平上，有一种趋势表明B染色体频率与基因组大小呈正相关。
Abstract We determined whether supernumerary B chromosomes were nonrandomly distributed among major angiosperm lineages and among lineages within families, as well as the identity of lineages with unusually high B-chromosome frequencies (hot spots). The incidence of B chromosomes for each taxon was gathered from databases showing species with and without these chromosomes (among species with known chromosome numbers). Heterogeneity was found at all ranks above the species level. About 8% of monocots had B chromosomes versus 3% for eudicots; they were rare in nonmonocot basal angiosperms. Significant heterogeneity in B-chromosome frequency occurred among related orders, families within orders, and major taxa within families. There were many B-chromosome hot spots, including Liliales and Commelinales at the order level. At the family level, there was a trend suggesting that B-chromosome frequencies are positively correlated with genome size.