THB1,一个假定的跨膜蛋白质,导致大米中的混合分解
Tae Wakabayashi1, Kiyoaki Kato1
1Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine, Nishi 2-11 Inada, Obihiro, Hokkaido 080-8555, Japan.
Breeding science
|November 18, 2024
概括
米中的混合分解是由两个基因THB1和THB2引起的. 在温带日本大米中发现的THB1的特定突变,可能导致其最近的进化,并有助于繁殖隔离.
科学领域:
- 遗传学和植物育种 植物育种
- 生殖生物学 生殖生物学
- 分子进化分子进化
背景情况:
- 混合分解是一种关键的后异位生殖隔离机制,阻碍了物种之间的基因流动.
- 在大米 (Oryza sativa) 中,混合分解归因于两个互补的衰退基因:温度敏感混合分解1 (thb1) 和thb2.
研究的目的:
- 确定THB1位点的界限,并确定导致混合分解的因果突变.
- 研究THB1和THB2等位基因在不同子组中的进化史和分布.
主要方法:
- 将THB1位点精细映射到9.1kb区域,其中包含单个基因.
- 在119个大米加入中对THB1的哈普洛型分析.
- 测试与thb2和thb1载体交叉,以确定功能性等位基因.
- 确定非同义SNP作为thb1.1的因果突变.
- 开发一种用于SNP检测的衍生裂变放大多态序列 (dCAPS) 标记.
主要成果:
- THB1位点被划定,揭示了一个编码一个假定的跨膜蛋白质的基因.
- 哈普洛型分析确定了THB1的22种不同的哈普洛型,其中哈普洛型2 (H2) 与thb1相关,并且仅限于温带日本.
- 在H2中,一个特定的非同义SNP被证实为thb1.1的因果突变.
- 在温带日,热带日和印加亚群中发现了THB2,这表明古代日的起源和侵入.
结论:
- THB1可能最近在温带的日本大米中进化,有助于繁殖隔离.
- THB2似乎是一个更古老的基因,在子子组中分布更广泛.
- 开发的dCAPS标志物有助于有效检测thb1因果SNP,有助于米育种工作.
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