解锁甜玉米中维生素E含量的遗传基础:通过全基因组关联研究扩大育种目标
Kun Li1, Yongtao Yu1, Nan Zhang1
1Crop Research Institute, Guangdong Academy of Agricultural Sciences; Guangdong Key Laboratory of Crop Genetic Improvement, Guangzhou, China.
概括
研究人员使用全基因组关联研究在甜玉米中确定了控制维生素E (托可克罗曼醇) 的关键基因. 这一发现为提高作物中维生素E含量铺平了道路.
科学领域:
- 植物遗传学 植物遗传学
- 营养生物化学 营养生物化学
- 农业科学 农业科学
背景情况:
- 托可克罗曼醇或维生素E是植物合成的必需的饮食抗氧化剂.
- 由于基因多样性较低和早期收获,对甜玉米中托科罗曼醇积累的理解是有限的.
- 托可克罗曼醇生物合成的基因在模型植物中已知,但在甜玉米中尚未完全阐明.
研究的目的:
- 确定影响甜玉米核中的托可克罗曼醇积累的遗传因素.
- 探索新的基因和调节维生素E含量的途径在多样化的甜玉米面板中.
- 为提高谷物作物中维生素E的育种策略提供基础.
主要方法:
- 全基因组关联研究 (GWAS) 在295个甜玉米个体上进行.
- 一组高密度分子标记物被用于全面的遗传分析.
- 采用CRISPR-Cas9技术,生成用于遗传验证的试验线.
主要成果:
- 确定了13个与托可克罗曼醇特征相关的定量特征位点 (QTL).
- 发现了ZmCS2,Zmshki1和ZmB4FMV1在α-托哥法醇积累中的新型作用.
- ZmCS2和Zmhppd1参与通过氨酸代谢调节总托科克罗曼醇含量.
结论:
- 这项研究阐明了甜玉米中维生素E变异的遗传结构.
- 鉴定的基因为标记器辅助的选择提供了标,以增加托可克罗曼醇水平.
- 这些发现支持通过基因改进提高甜玉米和其他谷物作物的维生素E含量.
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