Origin and evolution of Fragaria cascadensis

草莓的起源和进化

• 批准号: 289884711
• 负责人: Dr. Markus Siegfried Dillenberger
• 金额: --
• 依托单位: Department of Botany and Plant Pathology
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289884711?language=en
• 关键词: Origin; evolution; Fragaria; cascadensis

Polyploid hybrid speciation is one of the major driver of plant speciation. The ancestor of all angiosperms was probably polyploid, as were the ancestors of several important crop plants (e.g., wheat (Triticum L.) and strawberry (Fragaria L.)). To understand the evolution of polyploid hybrid species it is necessary to know which parental species contributed to the genome. This can be difficult, especially when several hybridization events occurred. Fragaria (Rosaceae) is a genus of 23 species containing the important crop species F. ×ananassa Duschesne ex Rozier. In Fragaria 11 of 23 species are polyploid hybrid species. There are tetra-, hexa-, octo- and decaploid species of which many are long known. In 2012 a new decaploid species, Fragaria cascadensis Hummer, was described. The ancestors of this species remain unclear, but it is suggested that it is a hybrid of F. vesca L. subsp. bracteata (A. Heller) Staudt and F. virginiana Mill. subsp. platypetala (Rydb.) Staudt. Due to its present distribution in the Cascade Range in Oregon (USA) a possible time frame for its evolution is after the melting of the Pleistocene glaciers in Oregon ca. 10,000 years ago. In this project I want to investigate the origin and evolution of this decaploid species. I will use target enrichment Hyb-Seq to obtain more than 10,000 loci of the nuclear genome and the plastome that can be compared with datasets of the potential parental species and aligned to the Fragaria vesca reference genome. With appropriate approximate Bayesian computation methods different models of origin (single vs. multiple origin) can be tested and divergence times will be calculated. The aim is to understand when, where and how often Fragaria cascadensis originated and how it evolved since then.

多倍体混合体规范是植物规格的主要驱动力之一。所有被子植物的祖先可能都是多倍体，以及几种重要的作物植物（例如小麦（Triticum L.）和草莓（Fragaria L.）的祖先）。要了解多倍体杂交物种的演变，有必要知道哪些亲本物种对基因组有贡献。这可能很困难，尤其是在发生多个杂交事件时。 Fragaria（酒渣鼻）是23种，其中包含重要的农作物种类F. Xananassa Duschesne ex Rozier。在Fragaria中，有23种是多倍体杂交物种。有四，六，八十分和十足的物种，其中许多人是备受闻名的。在2012年，描述了一种新的十二叶种类，即Fragaria cascadensis hummer。该物种的祖先尚不清楚，但建议它是F. vesca L. subsp的杂种。 Bracteata（A. Heller）Staudt和F. Virginiana Mill。亚种。 Platypetala（Rydb。）Staudt。由于其目前在俄勒冈州的级联范围内分布，其进化的可能时间是在俄勒冈州CA中的更新世冰川熔化之后。 10，000年前。在这个项目中，我想研究该脱皮物种的起源和进化。我将使用目标富集HYB-SEQ获得可与潜在亲本物种的数据集进行比较的核基因组和铂基因组的10,000多个局部，并与Fragaria vesca参考基因组保持一致。有了适当的贝叶斯计算方法，可以测试不同的原始模型（单一与多个原点），并将计算分歧时间。目的是了解Fragaria cascadensis起源于何时，何处和多久起源，以及自那时以来它如何发展。