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Evolutionary history of the NAM-B1 gene in wild and domesticated tetraploid wheat
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, Faculty of Science & Engineering. Nordiska museet, Swedish Museum of Cultural History, Stockholm, Sweden; 3The Archaeological Research Laboratory, Department of Archaeology and Classical Studies, Stockholm University, Stockholm, Sweden.ORCID iD: 0000-0002-4654-5722
Linköping University, Department of Physics, Chemistry and Biology, Biology. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-9850-5546
2017 (English)In: BMC Genetics, ISSN 1471-2156, E-ISSN 1471-2156, Vol. 18, article id 118Article in journal (Refereed) Published
Abstract [en]

Background

The NAM-B1 gene in wheat has for almost three decades been extensively studied and utilized in breeding programs because of its significant impact on grain protein and mineral content and pleiotropic effects on senescence rate and grain size. First detected in wild emmer wheat, the wild-type allele of the gene has been introgressed into durum and bread wheat. Later studies have, however, also found the presence of the wild-type allele in some domesticated subspecies. In this study we trace the evolutionary history of the NAM-B1 in tetraploid wheat species and evaluate it as a putative domestication gene.

Results

Genotyping of wild and landrace tetraploid accessions showed presence of only null alleles in durum. Domesticated emmer wheats contained both null alleles and the wild-type allele while wild emmers, with one exception, only carried the wild-type allele. One of the null alleles consists of a deletion that covers several 100 kb. The other null-allele, a one-basepair frame-shift insertion, likely arose among wild emmer. This allele was the target of a selective sweep, extending over several 100 kb.

Conclusions

The NAM-B1 gene fulfils some criteria for being a domestication gene by encoding a trait of domestication relevance (seed size) and is here shown to have been under positive selection. The presence of both wild-type and null alleles in domesticated emmer does, however, suggest the gene to be a diversification gene in this species. Further studies of genotype-environment interactions are needed to find out under what conditions selection on different NAM-B1 alleles have been beneficial.

Place, publisher, year, edition, pages
BioMed Central, 2017. Vol. 18, article id 118
Keywords [en]
Selective sweep, Grain protein content (GPC), Emmer, Durum, Domestication gene
National Category
Genetics Evolutionary Biology
Identifiers
URN: urn:nbn:se:liu:diva-144103DOI: 10.1186/s12863-017-0566-7ISI: 000418687000001OAI: oai:DiVA.org:liu-144103DiVA, id: diva2:1170914
Available from: 2018-01-05 Created: 2018-01-05 Last updated: 2018-01-10Bibliographically approved

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Lundström, MariaLeino, Matti W.Hagenblad, Jenny
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