一个杀手保护系统调节了混合不育性和米分离扭曲
Jiangyi Yang1, Xiaobo Zhao, Ke Cheng
1National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan 430070, China.
Science (New York, N.Y.)
|September 18, 2012
概括
米中的混合不育性是由S5位点的杀手保护基因系统调节的. 这种系统通过在雌激素形成过程中管理内质网膜应激来控制印加-日本米杂交品种的生育能力.
科学领域:
- 遗传学 是一个遗传学.
- 植物生物学 植物生物学
- 生殖生物学 生殖生物学
背景情况:
- 混合不育性是限制植物种群之间的基因流动的关键因素.
- 种植大米 (Oryza sativa L.) 的分种混合物,特别是印加和日本大米,通常表现出不育性.
研究的目的:
- 为了阐明在印加-日本米的混合不孕症背后的遗传机制.
- 确定S5位点参与调节生育的特定基因及其功能.
主要方法:
- 对S5位点及其紧密相关基因 (ORF3-ORF5) 在杂交品种中的分析.
- 调查杀手基因 (ORF5) 和保护基因 (ORF3) 在内质网膜 (ER) 应激反应中的作用.
- 检查杂交体中的性状细胞形成,编程细胞死亡和胚胎囊堕胎.
主要成果:
- 在S5位点,一个涉及ORF3,ORF4和ORF5的杀手保护系统调节了印加-日本杂交的生育能力.
- 杀手基因 (ORF5和ORF4) 在雌性子生成过程中诱导ER压力.
- 保护基因 (ORF3) 减轻了ER压力,确保了正常的性子细胞的产生;它缺少导致胚胎囊堕胎和分离扭曲.
结论:
- S5位点杀手-保护系统对于米杂交生育至关重要.
- 了解这个系统,可以了解印加米和日本米的分歧.
- 这种知识可以被潜在地应用于增强大米遗传改进和育种计划.
相关概念视频
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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).
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