Leaf morphology in Cowpea [Vigna unguiculata (L.) Walp]: QTL analysis, physical mapping and identifying a candidate gene using synteny with model legume species

BMC Genomics

Research Article

Marti Pottorff¹  Timothy J Close¹  Jeffrey D Ehlers²  Philip A Roberts³  Christian Fatokun⁴ 

[1] Department of Botany & Plant Sciences, University of California Riverside, Riverside, CA, USA;Department of Botany & Plant Sciences, University of California Riverside, Riverside, CA, USA;Bill & Melinda Gates Foundation, Seattle, WA, USA;Department of Nematology, University of California Riverside, Riverside, CA, USA;International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria;

关键词: QTL analysis;    Leaf morphology;    Genomics;    Genetics;    Physical map;    Synteny;    Candidate genes;    Cowpea;    Legumes;    EZA1/SWINGER;   

DOI  :  10.1186/1471-2164-13-234

 received in 2012-02-21, accepted in 2012-05-29,  发布年份 2012

来源: Springer

【 摘 要 】

BackgroundCowpea [Vigna unguiculata (L.) Walp] exhibits a considerable variation in leaf shape. Although cowpea is mostly utilized as a dry grain and animal fodder crop, cowpea leaves are also used as a high-protein pot herb in many countries of Africa.ResultsLeaf morphology was studied in the cowpea RIL population, Sanzi (sub-globose leaf shape) x Vita 7 (hastate leaf shape). A QTL for leaf shape, Hls (hastate leaf shape), was identified on the Sanzi x Vita 7 genetic map spanning from 56.54 cM to 67.54 cM distance on linkage group 15. SNP marker 1_0910 was the most significant over the two experiments, accounting for 74.7% phenotypic variance (LOD 33.82) in a greenhouse experiment and 71.5% phenotypic variance (LOD 30.89) in a field experiment. The corresponding Hls locus was positioned on the cowpea consensus genetic map on linkage group 4, spanning from 25.57 to 35.96 cM. A marker-trait association of the Hls region identified SNP marker 1_0349 alleles co-segregating with either the hastate or sub-globose leaf phenotype. High co-linearity was observed for the syntenic Hls region in Medicago truncatula and Glycine max. One syntenic locus for Hls was identified on Medicago chromosome 7 while syntenic regions for Hls were identified on two soybean chromosomes, 3 and 19. In all three syntenic loci, an ortholog for the EZA1/SWINGER (AT4G02020.1) gene was observed and is the candidate gene for the Hls locus. The Hls locus was identified on the cowpea physical map via SNP markers 1_0910, 1_1013 and 1_0992 which were identified in three BAC contigs; contig926, contig821 and contig25.ConclusionsThis study has demonstrated how integrated genomic resources can be utilized for a candidate gene approach. Identification of genes which control leaf morphology may be utilized to improve the quality of cowpea leaves for vegetable and or forage markets as well as contribute to more fundamental research understanding the control of leaf shape in legumes.

【 授权许可】

Unknown   
© Pottorff et al.; licensee BioMed Central Ltd. 2012. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.