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首页> 外文期刊>Genetic Resources and Crop Evolution >Chloroplast sequence data differentiate Maleae, and specifically Pyrus, species in the USDA-ARS National Plant Germplasm System
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Chloroplast sequence data differentiate Maleae, and specifically Pyrus, species in the USDA-ARS National Plant Germplasm System

机译：叶绿体序列数据区分Maleae和特异性Pyrus，在USDA-ARS国家植物种质系统中的物种

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The USDA-ARS National Plant Germplasm System (NPGS) maintains a large collection of Maleae, including 49 Malus taxa, 36 Pyrus taxa, and 24 additional genera with ornamental and plant breeding value. These plant genetic resources are primarily maintained clonally as trees or shrubs in field conditions, and seeds are also conserved for some species. We used NPGS Maleae taxa to assess the genetic diversity across the tribe Maleae and placed Pyrus taxa within this broader context using analytical methods that displayed the genetic relationships as a network, rather than as a traditional dendrogram. Sequence variation from four conserved chloroplast regions unraveled the complex and often reticulate genetic relationships among and within 109 economically important Maleae taxa. In a broad sense, chloroplast haplotypes differentiated Pyrus species within Sections Pyrus and Pashia. The genetic relationships amongst Pyrus species were found to be complex, likely resulting from multiple hybridization and expansion/contraction events during the speciation process. Knowledge of the genetic relationships among Maleae genera and/or species may aid in the selection of materials for use as rootstocks and or breeding (hybridization) programs. Future collection efforts to augment the NPGS accessions within the tribe Maleae will improve the coverage and representation and assure conservation of important Rosaceae genetic resources in the NPGS.
机译：USDA-ARS国家植物种质系统（NPGS）维持大量的Maleae系列，其中包括49个小植物分类群，36个Pyrus Taxa，以及24个具有装饰和植物育种价值的额外属。这些植物遗传资源主要克隆地保持为现场条件的树木或灌木，种子也为某些物种保守。我们使用NPGS Maleae Taxa评估T部落Maleae的遗传多样性，并使用展示遗传关系作为网络的分析方法，而不是作为传统的树木图，将Pyrus纳入的Pyrus纳撒布放在更广泛的背景下。来自四个保守的叶绿体区域的序列变异揭开了复杂的复杂性，并且经常在109个经济上重要的Maleae Taxa之间进行遗传关系。在广泛的意义上，叶绿体单倍型分化在Pyrus和Pashia部分内的Pyrus物种。发现Pyrus物种之间的遗传关系是复杂的，可能是在物种过程中的多种杂交和膨胀/收缩事件产生的。知识Maleae属和/或物种之间的遗传关系可以有助于选择用作砧木和或繁殖（杂交）计划的材料。未来的收集努力增加部落Maleae内的NPGS加入将改善NPGS中重要的Rosaceae遗传资源的覆盖范围和代表性，并保留守恒。

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