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The cuticular wax inhibitor locus Iw2 in wild diploid wheat Aegilops tauschii: phenotypic survey, genetic analysis, and implications for the evolution of common wheat.
BMC Plant Biol. 2014 Sep 16; 14:246.BP

Abstract

BACKGROUND

Cuticular wax production on plant surfaces confers a glaucous appearance and plays important roles in plant stress tolerance. Most common wheat cultivars, which are hexaploid, and most tetraploid wheat cultivars are glaucous; in contrast, a wild wheat progenitor, Aegilops tauschii, can be glaucous or non-glaucous. A dominant non-glaucous allele, Iw2, resides on the short arm of chromosome 2D, which was inherited from Ae. tauschii through polyploidization. Iw2 is one of the major causal genes related to variation in glaucousness among hexaploid wheat. Detailed genetic and phylogeographic knowledge of the Iw2 locus in Ae. tauschii may provide important information and lead to a better understanding of the evolution of common wheat.

RESULTS

Glaucous Ae. tauschii accessions were collected from a broad area ranging from Armenia to the southwestern coastal part of the Caspian Sea. Linkage analyses with five mapping populations showed that the glaucous versus non-glaucous difference was mainly controlled by the Iw2 locus in Ae. tauschii. Comparative genomic analysis of barley and Ae. tauschii was then used to develop molecular markers tightly linked with Ae. tauschii Iw2. Chromosomal synteny around the orthologous Iw2 regions indicated that some chromosomal rearrangement had occurred during the genetic divergence leading to Ae. tauschii, barley, and Brachypodium. Genetic associations between specific Iw2-linked markers and respective glaucous phenotypes in Ae. tauschii indicated that at least two non-glaucous accessions might carry other glaucousness-determining loci outside of the Iw2 locus.

CONCLUSION

Allelic differences at the Iw2 locus were the main contributors to the phenotypic difference between the glaucous and non-glaucous accessions of Ae. tauschii. Our results supported the previous assumption that the D-genome donor of common wheat could have been any Ae. tauschii variant that carried the recessive iw2 allele.

Authors

No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25224598

Citation

Nishijima, Ryo, et al. "The Cuticular Wax Inhibitor Locus Iw2 in Wild Diploid Wheat Aegilops Tauschii: Phenotypic Survey, Genetic Analysis, and Implications for the Evolution of Common Wheat." BMC Plant Biology, vol. 14, 2014, p. 246.
Nishijima R, Iehisa JC, Matsuoka Y, et al. The cuticular wax inhibitor locus Iw2 in wild diploid wheat Aegilops tauschii: phenotypic survey, genetic analysis, and implications for the evolution of common wheat. BMC Plant Biol. 2014;14:246.
Nishijima, R., Iehisa, J. C., Matsuoka, Y., & Takumi, S. (2014). The cuticular wax inhibitor locus Iw2 in wild diploid wheat Aegilops tauschii: phenotypic survey, genetic analysis, and implications for the evolution of common wheat. BMC Plant Biology, 14, 246. https://doi.org/10.1186/s12870-014-0246-y
Nishijima R, et al. The Cuticular Wax Inhibitor Locus Iw2 in Wild Diploid Wheat Aegilops Tauschii: Phenotypic Survey, Genetic Analysis, and Implications for the Evolution of Common Wheat. BMC Plant Biol. 2014 Sep 16;14:246. PubMed PMID: 25224598.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The cuticular wax inhibitor locus Iw2 in wild diploid wheat Aegilops tauschii: phenotypic survey, genetic analysis, and implications for the evolution of common wheat. AU - Nishijima,Ryo, AU - Iehisa,Julio C M, AU - Matsuoka,Yoshihiro, AU - Takumi,Shigeo, Y1 - 2014/09/16/ PY - 2014/06/18/received PY - 2014/09/10/accepted PY - 2014/9/17/entrez PY - 2014/9/17/pubmed PY - 2015/11/3/medline SP - 246 EP - 246 JF - BMC plant biology JO - BMC Plant Biol VL - 14 N2 - BACKGROUND: Cuticular wax production on plant surfaces confers a glaucous appearance and plays important roles in plant stress tolerance. Most common wheat cultivars, which are hexaploid, and most tetraploid wheat cultivars are glaucous; in contrast, a wild wheat progenitor, Aegilops tauschii, can be glaucous or non-glaucous. A dominant non-glaucous allele, Iw2, resides on the short arm of chromosome 2D, which was inherited from Ae. tauschii through polyploidization. Iw2 is one of the major causal genes related to variation in glaucousness among hexaploid wheat. Detailed genetic and phylogeographic knowledge of the Iw2 locus in Ae. tauschii may provide important information and lead to a better understanding of the evolution of common wheat. RESULTS: Glaucous Ae. tauschii accessions were collected from a broad area ranging from Armenia to the southwestern coastal part of the Caspian Sea. Linkage analyses with five mapping populations showed that the glaucous versus non-glaucous difference was mainly controlled by the Iw2 locus in Ae. tauschii. Comparative genomic analysis of barley and Ae. tauschii was then used to develop molecular markers tightly linked with Ae. tauschii Iw2. Chromosomal synteny around the orthologous Iw2 regions indicated that some chromosomal rearrangement had occurred during the genetic divergence leading to Ae. tauschii, barley, and Brachypodium. Genetic associations between specific Iw2-linked markers and respective glaucous phenotypes in Ae. tauschii indicated that at least two non-glaucous accessions might carry other glaucousness-determining loci outside of the Iw2 locus. CONCLUSION: Allelic differences at the Iw2 locus were the main contributors to the phenotypic difference between the glaucous and non-glaucous accessions of Ae. tauschii. Our results supported the previous assumption that the D-genome donor of common wheat could have been any Ae. tauschii variant that carried the recessive iw2 allele. SN - 1471-2229 UR - https://www.unboundmedicine.com/medline/citation/25224598/The_cuticular_wax_inhibitor_locus_Iw2_in_wild_diploid_wheat_Aegilops_tauschii:_phenotypic_survey_genetic_analysis_and_implications_for_the_evolution_of_common_wheat_ L2 - https://bmcplantbiol.biomedcentral.com/articles/10.1186/s12870-014-0246-y DB - PRIME DP - Unbound Medicine ER -