JMJ720编码一种H3K9me2脱甲酶,可以调节大米的粒度
Xiaoche Wang1, Zhiwen Yu1, Xiang Li1
1Rice Research Institute of Shenyang Agricultural University, Shenyang, 110 866, China.
The Plant journal : for cell and molecular biology
|September 6, 2025
概括
研究人员发现了调节米粒大小的JMJ720基因. 通过表观遗传控制OsNDB2基因, 它的缺失会导致更大的谷物, 这为提高水产量提供了新的策略.
科学领域:
- 植物分子遗传学
- 表观遗传学
- 农作物科学
背景情况:
- 谷物大小是影响大米产量的关键因素.
- 控制大米粒大小的精确分子机制尚未完全理解.
- 表观遗传调节在植物发育和特征决定中起作用.
研究的目的:
- 确定大米粒大小的关键遗传调节者.
- 通过表观遗传途径阐明控制粒径的分子机制.
- 探索提高大米粒大小和产量的潜在策略.
主要方法:
- 基于地图的克隆来识别JMJ720的位置.
- 对jmj720突变体进行粒度表型分析.
- 在OsNDB2位点测定H3K9me2水平的基因组修饰试验.
- 在野生型和突变型大米中分析OsNDB2的基因表达.
主要成果:
- 鉴定出JMJ720基因是大米粒大小的关键调节者.
- 与野生大米相比, jmj720突变体呈现出更大的粒度.
- JMJ720作为基因组H3K9me2脱甲酶,抑制OsNDB2的表达,导致更大的粒度.
- 由JMJ720介导的OsNDB2表达的减少与粒度的增加直接相关.
结论:
- 一个涉及JMJ720和基因素甲基化的新型表观遗传机制调节了大米粒的大小.
- JMJ720通过表观基因调节OsNDB2的表达来控制颗粒大小.
- 针对JMJ720-OsNDB2路径提供了一个有前途的米培育大粒和提高产量.
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