Genetic analysis of inflorescence and plant height components in sorghum (Panicoidae) and comparative genetics with rice (Oryzoidae)

BMC Plant Biology

Research Article

Alexandra Kerr¹  Christine Phillips¹  Gabriel Mills¹  Ethan Epps¹  Jon Robertson¹  Jay Cromwell¹  Yelena Lugin¹  Valorie H Goff¹  Wenqian Kong²  Dong Zhang³  Andrew H Paterson⁴ 

[1] Plant Genome Mapping Laboratory, University of Georgia, 30602, Athens, GA, USA;Plant Genome Mapping Laboratory, University of Georgia, 30602, Athens, GA, USA;Department of Crop and Soil Sciences, University of Georgia, 30602, Athens, GA, USA;Plant Genome Mapping Laboratory, University of Georgia, 30602, Athens, GA, USA;Institute of Bioinformatics, University of Georgia, 30602, Athens, GA, USA;Plant Genome Mapping Laboratory, University of Georgia, 30602, Athens, GA, USA;Institute of Bioinformatics, University of Georgia, 30602, Athens, GA, USA;Department of Crop and Soil Sciences, University of Georgia, 30602, Athens, GA, USA;Department of Plant Biology, University of Georgia, 30602, Athens, GA, USA;Department of Genetics, University of Georgia, 30602, Athens, GA, USA;

关键词: Sorghum;    GWAS;    Biparental QTL mapping;    Inflorescence;    Flowering time;    Plant height;    Domestication;    Genetic correspondence;   

DOI  :  10.1186/s12870-015-0477-6

 received in 2014-11-02, accepted in 2015-03-19,  发布年份 2015

来源: Springer

【 摘 要 】

BackgroundDomestication has played an important role in shaping characteristics of the inflorescence and plant height in cultivated cereals. Taking advantage of meta-analysis of QTLs, phylogenetic analyses in 502 diverse sorghum accessions, GWAS in a sorghum association panel (n = 354) and comparative data, we provide insight into the genetic basis of the domestication traits in sorghum and rice.ResultsWe performed genome-wide association studies (GWAS) on 6 traits related to inflorescence morphology and 6 traits related to plant height in sorghum, comparing the genomic regions implicated in these traits by GWAS and QTL mapping, respectively. In a search for signatures of selection, we identify genomic regions that may contribute to sorghum domestication regarding plant height, flowering time and pericarp color. Comparative studies across taxa show functionally conserved ‘hotspots’ in sorghum and rice for awn presence and pericarp color that do not appear to reflect corresponding single genes but may indicate co-regulated clusters of genes. We also reveal homoeologous regions retaining similar functions for plant height and flowering time since genome duplication an estimated 70 million years ago or more in a common ancestor of cereals. In most such homoeologous QTL pairs, only one QTL interval exhibits strong selection signals in modern sorghum.ConclusionsIntersections among QTL, GWAS and comparative data advance knowledge of genetic determinants of inflorescence and plant height components in sorghum, and add new dimensions to comparisons between sorghum and rice.

【 授权许可】

Unknown   
© Zhang et al.; licensee BioMed Central. 2015. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

【 图 表 】

Fig. 2