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Cenozoic diversification in the Bromelioideae (Bromeliaceae): character evolution and climate change

凤梨科（Bromeliaceae）的新生代多样化：性状进化和气候变化

基本信息

批准号：
65267578
负责人：
Dr. Katharina Schulte
金额：
--
依托单位：
Abteilung Botanik und Molekulare Evolutionsforschung
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/65267578?language=en
关键词：
Cenozoic diversification Bromelioideae Bromeliaceae character

项目摘要

Bromeliaceae display striking evolutionary success in terrestrial as well as epiphytic habitats, nevertheless the spreading to the recent centre of diversity and evolution of crucial ecological traits could not be reconstructed yet. Subfamily Bromelioideae (approx. 810 spp.) has comparatively recently radiated in E South America. The majority of species is epiphytic, displays tank habit, Crassulacean Acid Metabolism (CAM) and is centred in coastal rainforests. Few genera are morphologically and ecologically distinct, occupying humid temperate Andean or dry lowland habitats. Our previous molecular analyses contradicted current hypotheses of character evolution in the subfamily. Nevertheless, phylogenetic resolution achieved up to now was not sufficient to unambiguously trace character evolution. With the establishment of two highly variable nuclear markers (PRK: phosphoribulokinase gene and RPB2: RNA-polymerase subunit B) resolution and statistical support of the phylogeny will improve considerably. The resulting phylogeny will be used to reconstruct (1) evolutionary changes in climate-/ecospace, (2) ancestral character states, and (3) for dating of diversification of Bromelioideae. For understanding the patterns of speciation processes as well as evolution of important traits and the development of present distribution, vegetation and climate history in the Cenozoic will be included in our comparative studies.

凤梨科植物在陆生和附生生境中表现出惊人的进化成功，然而，向最近的多样性中心的传播和重要生态性状的进化还不能重建。Bromelioideae（Bromelioideae）810种）最近才在南美洲东部辐射。大多数物种是附生的，显示坦克的习惯，景天科酸代谢（CAM）和集中在沿海雨林。少数属在形态和生态上是独特的，占据潮湿的温带安第斯山脉或干燥的低地栖息地。我们先前的分子分析与目前关于该亚科性状进化的假设相矛盾。然而，迄今为止，系统发育分辨率还不足以明确地追踪性状进化。随着两个高度可变的核标记（PRK：磷酸核酮糖激酶基因和RPB 2：RNA聚合酶亚基B）的建立，系统发育的分辨率和统计支持将大大提高。由此产生的系统发育将被用于重建（1）气候/生态空间的进化变化，（2）祖先的特征状态，（3）Bromelioideae多样化的日期。为了了解物种形成过程的模式以及重要特征的演化和现在分布的发展，我们将在新生代的植被和气候历史中进行比较研究。