Abstract：
Aechmea subgenus Ortgiesia comprises ca. 20 species distributed in Brazil, Argentina, Paraguay, and Uruguay, with a center of diversity in the Brazilian Atlantic rainforest. We examined interspecific relationships of Ortgiesia based on Amplified Fragment Length Polymorphisms (AFLP). Ninety-six accessions belonging to 14 species of Ortgiesia were sampled, and genotyped with 11 AFLP primer combinations. The neighbor joining (NJ) tree depicted two main genetic groups within Aechmea subgenus Ortgiesia, and four subgroups. The NJ tree showed short internal branches, indicating an overall shallow genetic divergence among Ortgiesia species as expected for the recently radiated subfamily Bromelioideae. Our results suggest that hybridization and/or incomplete lineage sorting may have hampered the reconstruction of interspecific relationships in Aechmea subgenus Ortgiesia. The mapping of petal color (yellow, blue, pink, or white), inflorescence type (simple or compound), and inflorescence shape (ellipsoid, subcylindric, cylindric, or pyramidal) against the NJ tree indicated that these characters are of limited taxonomic use in Aechmea subgenus Ortgiesia due to homoplasy. An analysis of the current distribution of Ortgiesia identified the southern region of the Brazilian Atlantic rainforest, between latitudes of 26° and 27°S, as the center of diversity for the subgenus.
摘要：
Aechmea亚属Ortgiesia包括约。分布在巴西的20种，阿根廷,巴拉圭,乌拉圭,巴西大西洋雨林的多样性中心。我们基于扩增片段长度多态性（AFLP）检查了Ortgiesia的种间关系。对属于14种Ortgiesia的96种种质进行了采样，并用11种AFLP引物组合进行基因分型。邻居连接（NJ）树描绘了Aechmea亚属Ortgiesia中的两个主要遗传组，和四个小组。NJ树显示出短的内部分支，表明Ortgiesia物种之间的总体遗传差异与最近辐射的Bromelioideae亚科的预期相同。我们的结果表明，杂交和/或不完整的谱系分类可能阻碍了Aechmea亚属Ortgiesia的种间关系的重建。花瓣颜色的映射(黄色，蓝色,粉色,或白色)，花序类型（简单或复合），和花序形状(椭圆形，亚圆柱形，圆柱状，或锥体）针对NJ树表明，由于同质，这些特征在Aechmea亚属Ortgiesia中的分类学用途有限。对Ortgiesia当前分布的分析确定了巴西大西洋雨林的南部地区，在南纬26°和27°之间，作为亚属多样性的中心。
