一种新型QTLDM9.1的精细映射,使瓜子具有菌耐药性
Xuejun Zhang1,2,3, Yueming Ling2, Wenli Yang2
1College of Horticulture, China Agricultural University, Beijing, China.
Frontiers in plant science
|June 28, 2023
概括
研究人员确定了一个主要的遗传基因位点DM9.1,赋予了瓜子对菌的抵抗力. 这一发现为开发改进的,抗病的瓜子品种提供了有价值的标记.
科学领域:
- 植物病理学 植物病理学
- 遗传学 是一个遗传学.
- 农业科学 农业科学
背景情况:
- 唐尼菌 (DM) 严重影响全球西瓜产量,造成了巨大的经济损失.
- 开发具有固有的耐药性品种是最有效的疾病管理策略.
- 识别对DM耐药性负责的基因对于培育耐药瓜子品种至关重要.
研究的目的:
- 为了绘制与瓜子下耐药性相关的定量特征位点 (QTLs).
- 识别和验证DM耐药瓜子的标记器辅助育种的遗传标记物.
主要方法:
- 从一种耐DM的西瓜种群构建两个F2种群 (PI 442177).
- 使用基因型测序 (GBS) 生成高密度遗传地图.
- 使用基因图和QTL-seq分析进行QTL映射.
- 使用竞争性等位基特异性PCR (KASP) 试验,精确地绘制抵抗位点.
主要成果:
- 一个主要的QTL,名为DM9.1,在不同的生长阶段被一致识别,解释了24.3-37.7%的表型变异.
- QTL-seq分析验证了F2种群中DM9.1的存在.
- DM9.1被精确地映射到1.0 Mb的间隔,并开发了一个共同分离的KASP标志物.
结论:
- 已确定的主要QTL,DM9.1,是克隆瓜中DM耐药基因的有价值目标.
- 开发的KASP标记器在瓜子育种计划中促进了高效的标记器辅助选择,以抵抗菌.
相关概念视频
Monohybrid Crosses
Overview
Dihybrid Crosses
Overview
Trihybrid Crosses
Trihybrid Crosses
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...
Some of Mendel’s crosses examined three pairs of contrasting characteristics. Such a cross is called a trihybrid cross. A trihybrid cross is a combination of three individual monohybrid crosses. For example, plant height (tall vs. short), seed shape (round vs. wrinkled), and seed color (yellow vs. green).
The F1 generation plants of a trihybrid cross are heterozygous for all three traits and produce eight gametes. Upon self-fertilization, these gametes have an equal chance to...


