一种新的冬季小麦遗传资源拥有来自合成六倍体小麦的尚未开发的多样性
Tally I C Wright1, Richard Horsnell2, Bethany Love2
1The John Bingham Laboratory, NIAB, 93 Lawrence Weaver Road, Cambridge, CB3 0LE, UK. tally.wright@NIAB.com.
概括
一个新的冬季小麦嵌套协会映射种群 (NIAB_WW_SHW_NAM) 有助于识别合成六倍体小麦的遗传特征. 这种资源通过改善开花时间,植物高度和抗黄色生能力来增强现代小麦品种.
科学领域:
- 植物遗传学和育种.
- 农业科学 农业科学
- 基因组学就是基因组学.
背景情况:
- 现代小麦品种面临着遗传多样性的瓶.
- 合成六倍体小麦 (SHW) 提供了来自小麦祖先的基丰富的来源.
- 通过对四体和双体祖先的杂交重合成小麦,产生SHW.
研究的目的:
- 使用SHW.开发一个大型,多样化的冬季小麦嵌协会绘图 (NAM) 种群.
- 利用这一种群绘制定量特征位点 (QTLs),可以改善精英小麦品种.
- 评估SHW衍生的特征在当前英国小麦环境中的潜力.
主要方法:
- 开发了NIAB冬季小麦合成六合体小麦嵌套协会映射 (NIAB_WW_SHW_NAM) 种群 (3241种基因型).
- 从15个Triticum durum捐赠者和47个Aegilops tauschii加入中创建了初级SHW线路.
- 使用单核酸多态 (SNP) 阵列对种群进行基因定型,并进行实地试验.
主要成果:
- 检测到27个QTL的开花时间,植物的高度,和黄色 (Yr) 耐药性.
- 鉴定了4D染色体上Yr抗性的显著QTL,与Yr28基因对应.
- 观察到,主要的SHW父母通常比精英品种"Robigus"表现出更早的开花,更高的身材和更好的YR抵抗力.
结论:
- NIAB_WW_SHW_NAM种群是绘制SHW的QTL来增强现代小麦的宝贵资源.
- 这项研究提供了Yr28基因在当前的英国环境和遗传背景中有效运作的第一个证据.
- 这种NAM种群具有改善小麦品种的巨大潜力,有前途的基因型已经被育种者选择.
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