侧面根密度和长度的新型QTL改善了大米 (Oryza sativa L.) 的吸收
Lam Thi Dinh1,2,3, Yoshiaki Ueda1, Daniel Gonzalez1
1Crop, Livestock and Environment Division, Japan International Research Center for Agricultural Sciences (JIRCAS), 1-1 Ohwashi, Tsukuba, Ibaraki, 305-8686, Japan.
概括
米有两种侧根类型:L型和S型. 识别根密度和长度的遗传标记可以改善作物适应营养不良的土壤.
科学领域:
- 植物生物学 植物生物学
- 遗传学 是一个遗传学.
- 农业学是一种农业学.
背景情况:
- 米具有两种截然不同的横根类型:不确定的L型和确定的S型.
- 这两种根类型对于营养和水的吸收至关重要,基因型变异在具有挑战性的环境中提供了提高作物的潜力.
研究的目的:
- 为了优化大米的选方法,侧面根密度和长度.
- 识别与这些根特征变异相关的遗传标记,用于育种应用.
主要方法:
- 对不同生长介质 (营养溶液与土壤) 的根特征进行比较分析.
- 定量特征位置 (QTL) 映射使用从具有对比根特征的父母衍生出的种群.
- 根系表型,包括扫描和测量密度和长度,在低场条件下.
主要成果:
- 在营养溶液中选有效地确定了根密度的基因型变异,而在根长度变异方面,土壤选更好.
- 5号染色体上的一个主要的QTL (qLDC5) 显著影响了L型横向根密度 (LDC),解释了46%的表型变异.
- 其他QTL被确定为S型密度 (SDC,SDL) 和长度 (SLL) 以及皇冠根数 (RNO).
- 发现最不发达国家和RNO是吸收的最重要贡献者,其次是SDL.
结论:
- 已确定的QTLs,特别是qLDC5,qRNO9和qSDL9,为标记器辅助的选择提供了有价值的目标,以增强大米中的吸收.
- 缺乏检测到的权衡表明,对这些QTL进行金字塔化是开发改进品种的可行的.
- 分子标记物为表型选择提供了具有成本效益的替代方案,用于将理想的根密度特征纳入育种计划中.
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