Journal article
Association mapping provides insights into the origin and the fine structure of the sorghum aluminum tolerance locus, AltSB
PloS one, Vol.9(1), pp.e87438-e87438
2014
Handle:
https://hdl.handle.net/2376/109195
PMCID: PMC3907521
PMID: 24498106
Abstract
Root damage caused by aluminum (Al) toxicity is a major cause of grain yield reduction on acid soils, which are prevalent in tropical and subtropical regions of the world where food security is most tenuous. In sorghum, Al tolerance is conferred by SbMATE, an Al-activated root citrate efflux transporter that underlies the major Al tolerance locus, AltSB, on sorghum chromosome 3. We used association mapping to gain insights into the origin and evolution of Al tolerance in sorghum and to detect functional variants amenable to allele mining applications. Linkage disequilibrium across the AltSB locus decreased much faster than in previous reports in sorghum, and reached basal levels at approximately 1000 bp. Accordingly, intra-locus recombination events were found to be extensive. SNPs and indels highly associated with Al tolerance showed a narrow frequency range, between 0.06 and 0.1, suggesting a rather recent origin of Al tolerance mutations within AltSB. A haplotype network analysis suggested a single geographic and racial origin of causative mutations in primordial guinea domesticates in West Africa. Al tolerance assessment in accessions harboring recombinant haplotypes suggests that causative polymorphisms are localized to a ∼6 kb region including intronic polymorphisms and a transposon (MITE) insertion, whose size variation has been shown to be positively correlated with Al tolerance. The SNP with the strongest association signal, located in the second SbMATE intron, recovers 9 of the 14 highly Al tolerant accessions and 80% of all the Al tolerant and intermediately tolerant accessions in the association panel. Our results also demonstrate the pivotal importance of knowledge on the origin and evolution of Al tolerance mutations in molecular breeding applications. Allele mining strategies based on associated loci are expected to lead to the efficient identification, in diverse sorghum germplasm, of Al tolerant accessions able maintain grain yields under Al toxicity.
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Details
- Title
- Association mapping provides insights into the origin and the fine structure of the sorghum aluminum tolerance locus, AltSB
- Creators
- Fernanda F Caniato - Embrapa Maize and Sorghum, Sete Lagoas, Minas Gerais, BrazilMartha T Hamblin - Institute for Genomic Diversity, Cornell University, Ithaca, New York, United States of AmericaClaudia T Guimaraes - Embrapa Maize and Sorghum, Sete Lagoas, Minas Gerais, BrazilZhiwu Zhang - Institute for Genomic Diversity, Cornell University, Ithaca, New York, United States of AmericaRobert E Schaffert - Embrapa Maize and Sorghum, Sete Lagoas, Minas Gerais, BrazilLeon V Kochian - Robert W. Holley Center for Agriculture and Health, U.S. Department of Agriculture - Agricultural Research Service, Cornell University, Ithaca, New York, United States of AmericaJurandir V Magalhaes - Embrapa Maize and Sorghum, Sete Lagoas, Minas Gerais, Brazil
- Publication Details
- PloS one, Vol.9(1), pp.e87438-e87438
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- United States
- Identifiers
- 99900547284301842
- Language
- English
- Resource Type
- Journal article