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Genetic mapping of a novel recessive allele for non-glaucousness in wild diploid wheat Aegilops tauschii: implications for the evolution of common wheat.
Genetica. 2018 Apr; 146(2):249-254.G

Abstract

Cuticular wax on the aerial surface of plants has a protective function against many environmental stresses. The bluish-whitish appearance of wheat leaves and stems is called glaucousness. Most modern cultivars of polyploid wheat species exhibit the glaucous phenotype, while in a wild wheat progenitor, Ae. tauschii, both glaucous and non-glaucous accessions exist. Iw2, a wax inhibitor locus on the short arm of chromosome 2D, is the main contributor to this phenotypic variation in Ae. tauschii, and the glaucous/non-glaucous phenotype of Ae. tauschii is usually inherited by synthetic hexaploid wheat. However, a few synthetic lines show the glaucous phenotype although the parental Ae. tauschii accessions are non-glaucous. Molecular marker genotypes indicate that the exceptional non-glaucous Ae. tauschii accessions share the same genotype in the Iw2 chromosomal region as glaucous accessions, suggesting that these accessions have a different causal locus for their phenotype. This locus was assigned to the long arm of chromosome 3D using an F2 mapping population and designated W4, a novel glaucous locus in Ae. tauschii. The dominant W4 allele confers glaucousness, consistent with phenotypic observation of Ae. tauschii accessions and the derived synthetic lines. These results implied that glaucous accessions of Ae. tauschii with the W2W2iw2iw2W4W4 genotype could have been the D-genome donor of common wheat.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Nishijima R
Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Kobe, 657-8501, Japan.
Tanaka C
Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Kobe, 657-8501, Japan.
Yoshida K
Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Kobe, 657-8501, Japan. Japan Science and Technology Agency, PRESTO, Kawaguchi, Saitama, 332-0012, Japan.
Takumi S
Graduate School of Agricultural Science, Kobe University, Rokkodai 1-1, Nada, Kobe, 657-8501, Japan. takumi@kobe-u.ac.jp.

MeSH

AllelesChromosome MappingDiploidyEvolution, MolecularGenes, PlantGenes, RecessivePhenotypePoaceaeTriticum

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29397498

Citation

Nishijima, Ryo, et al. "Genetic Mapping of a Novel Recessive Allele for Non-glaucousness in Wild Diploid Wheat Aegilops Tauschii: Implications for the Evolution of Common Wheat." Genetica, vol. 146, no. 2, 2018, pp. 249-254.
Nishijima R, Tanaka C, Yoshida K, et al. Genetic mapping of a novel recessive allele for non-glaucousness in wild diploid wheat Aegilops tauschii: implications for the evolution of common wheat. Genetica. 2018;146(2):249-254.
Nishijima, R., Tanaka, C., Yoshida, K., & Takumi, S. (2018). Genetic mapping of a novel recessive allele for non-glaucousness in wild diploid wheat Aegilops tauschii: implications for the evolution of common wheat. Genetica, 146(2), 249-254. https://doi.org/10.1007/s10709-018-0012-4
Nishijima R, et al. Genetic Mapping of a Novel Recessive Allele for Non-glaucousness in Wild Diploid Wheat Aegilops Tauschii: Implications for the Evolution of Common Wheat. Genetica. 2018;146(2):249-254. PubMed PMID: 29397498.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Genetic mapping of a novel recessive allele for non-glaucousness in wild diploid wheat Aegilops tauschii: implications for the evolution of common wheat. AU - Nishijima,Ryo, AU - Tanaka,Chisa, AU - Yoshida,Kentaro, AU - Takumi,Shigeo, Y1 - 2018/02/03/ PY - 2017/10/12/received PY - 2018/01/31/accepted PY - 2018/2/6/pubmed PY - 2018/8/16/medline PY - 2018/2/5/entrez KW - Allopolyploid speciation KW - Cuticular wax KW - Intraspecific variation KW - Synthetic hexaploid KW - Wheat SP - 249 EP - 254 JF - Genetica JO - Genetica VL - 146 IS - 2 N2 - Cuticular wax on the aerial surface of plants has a protective function against many environmental stresses. The bluish-whitish appearance of wheat leaves and stems is called glaucousness. Most modern cultivars of polyploid wheat species exhibit the glaucous phenotype, while in a wild wheat progenitor, Ae. tauschii, both glaucous and non-glaucous accessions exist. Iw2, a wax inhibitor locus on the short arm of chromosome 2D, is the main contributor to this phenotypic variation in Ae. tauschii, and the glaucous/non-glaucous phenotype of Ae. tauschii is usually inherited by synthetic hexaploid wheat. However, a few synthetic lines show the glaucous phenotype although the parental Ae. tauschii accessions are non-glaucous. Molecular marker genotypes indicate that the exceptional non-glaucous Ae. tauschii accessions share the same genotype in the Iw2 chromosomal region as glaucous accessions, suggesting that these accessions have a different causal locus for their phenotype. This locus was assigned to the long arm of chromosome 3D using an F2 mapping population and designated W4, a novel glaucous locus in Ae. tauschii. The dominant W4 allele confers glaucousness, consistent with phenotypic observation of Ae. tauschii accessions and the derived synthetic lines. These results implied that glaucous accessions of Ae. tauschii with the W2W2iw2iw2W4W4 genotype could have been the D-genome donor of common wheat. SN - 1573-6857 UR - https://www.unboundmedicine.com/medline/citation/29397498/Genetic_mapping_of_a_novel_recessive_allele_for_non_glaucousness_in_wild_diploid_wheat_Aegilops_tauschii:_implications_for_the_evolution_of_common_wheat_ DB - PRIME DP - Unbound Medicine ER -