Genetic mapping of a novel recessive allele for non-glaucousness in wild diploid wheat Aegilops tauschii: implications for the evolution of common wheat
Genetic mapping of a novel recessive allele for non-glaucousness in wild diploid wheat Aegilops tauschii: implications for the evolution of common wheat
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DOI：
10.1007/s10709-018-0012-4
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发表时间：
2018-02
期刊：
影响因子：
1.5
通讯作者：
Ryo Nishijima;C. Tanaka;Kentaroh Yoshida;S. Takumi
中科院分区：
文献类型：
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作者：
Ryo Nishijima;C. Tanaka;Kentaroh Yoshida;S. Takumi
植物气生表面的角质层蜡质对许多环境胁迫具有保护作用。小麦叶和茎的蓝白色外观称为蓝绿色。大多数现代多倍体小麦品种表现出白霜表型，而在野生小麦祖先，Ae。2D染色体短臂上的蜡质抑制基因Iw 2是导致节节麦表型变异的主要原因。tauschii和Ae. tauschii通常由人工合成的六倍体小麦遗传。然而，少数合成系显示出白绿色表型，尽管亲本Ae。tauschii的加入是非白霜的。分子标记基因型表明，例外的non-glaucousAe。在Iw 2染色体区域，节节麦种质与粉绿麦种质具有相同的基因型，表明这些种质具有不同的表型致病基因座。利用F2作图群体将该位点定位在3D染色体长臂上，命名为W 4，这是一个新的蓝绿色基因座。tauschii显性W 4等位基因赋予白灰色，与表型观察Ae。和衍生的合成系。这些结果表明，蓝绿色种质的Ae。具有W2 W2 iw 2 iw 2 W 4 W 4基因型的节节麦可能是普通小麦D染色体组的供体。
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 inAe. tauschii, and the glaucous/non-glaucous phenotype ofAe. tauschiiis usually inherited by synthetic hexaploid wheat. However, a few synthetic lines show the glaucous phenotype although the parentalAe. tauschiiaccessions are non-glaucous. Molecular marker genotypes indicate that the exceptional non-glaucousAe. tauschiiaccessions share the same genotype in theIw2chromosomal 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 F2mapping population and designatedW4, a novel glaucous locus inAe. tauschii. The dominantW4allele confers glaucousness, consistent with phenotypic observation ofAe. tauschiiaccessions and the derived synthetic lines. These results implied that glaucous accessions ofAe. tauschiiwith theW2W2iw2iw2W4W4genotype could have been the D-genome donor of common wheat.