Encholirium is a genus of 31 xerophytic terrestrial or epilithic bromeliad species endemic to eastern Brazil. Together with Dyckia and Deuterocohnia, it forms the so-called xeric clade of the Pitcairnioideae subfamily of Bromeliaceae. Encholirium species are adapted to rocky landscapes, and many of them are found in the rocky grassland fields of the Espinhaço in the state of Minas Gerais, which is considered the diversity center of the genus. Encholirium species and other bromeliads growing on isolated, island-like habitats like rock outcrops and “inselbergs” are often characterized by high levels of genetic structure and limited gene flow among populations, but there are also exceptions. In the present study, we applied nuclear and chloroplast microsatellite markers to investigate the genetic diversity and population structure of E. magalhaesii L.B.Sm., an endemic species of the Espinhaço, collected in four localities of the Diamantina municipality in southeastern Brazil. Moderate genetic differentiation among localities was revealed by the nuclear markers (Fst = 0.199), whereas genetic structuring was much higher with plastid markers (Fst = 0.496). Estimations of pollen/seed flow ratios suggest that pollen flow is more efficient in maintaining the genetic connectivity among E. magalhaesii populations than seed flow.

中文翻译：

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Encholirium magalhaesii种群间的遗传结构和基因流动，一种岩石草原地凤梨科植物

Encholirium 是巴西东部特有的 31 种旱生陆生或附生凤梨科植物属。它与 Dyckia 和 Deuterocohnia 一起形成了菠萝科 Pitcairnioideae 亚科的所谓干旱进化枝。Encholirium 物种适应岩石景观，其中许多发现于米纳斯吉拉斯州 Espinhaço 的岩石草原，该地区被认为是该属的多样性中心。Encholirium 物种和其他凤梨科植物生长在孤立的、岛屿状的栖息地，如岩石露头和“inselbergs”，通常具有高水平的遗传结构和种群间有限的基因流动，但也有例外。在本研究中，我们应用核和叶绿体微卫星标记来研究 E. magalhaesii L. 的遗传多样性和种群结构。B.Sm.，一种 Espinhaço 的特有物种，采集于巴西东南部迪亚曼蒂纳市的四个地区。核标记（Fst = 0.199）揭示了地区之间的适度遗传分化，而质体标记（Fst = 0.496）的遗传结构要高得多。花粉/种子流比率的估计表明，花粉流在维持 E. magalhaesii 种群之间的遗传连通性方面比种子流更有效。