提高玉米的种子蛋白质含量和使用效率
Yongcai Huang1, Haihai Wang1, Yidong Zhu1,2
1National Key Laboratory of Plant Molecular Genetics, CAS Center for Excellence in Molecular Plant Sciences, Shanghai Institute of Plant Physiology and Ecology Chinese Academy of Sciences, Shanghai, China.
Nature
|November 17, 2022
概括
科学家发现了一种基因,即TEOSINTE高蛋白9 (THP9), 将该基因引入现代玉米增加了蛋白质含量和效率,而不会影响产量.
科学领域:
- 植物遗传学
- 农作物科学
- 分子生物学
背景情况:
- 泰奥辛特的种子蛋白质比现代玉米要高得多.
- 这种高蛋白质含量的遗传基础在很大程度上仍未被描述.
研究的目的:
- 鉴定导致茶素中种子蛋白质含量高的遗传因素.
- 研究这些因素对改善玉米营养质量的潜力.
主要方法:
- 连续型DNA测序的三组组合.
- 基于地图的克隆以确定定量特征位置 (QTL).
- 基因表达和转录拼接在和玉米的分析.
- 在玉米中的候选基因的转基因表达和内进.
主要成果:
- 在9号染色体上发现了一种主要的QTL,即TEOSINTE HIGH PROTEIN 9 (THP9).
- THP9对阿斯巴拉金合成酶4进行编码,在酸中表达很高,但在玉米B73中受到拼接缺陷的影响.
- 在B73玉米中增加了THP9-teosinte种子蛋白的转基因表达.
- 在没有降低产量的玉米中增强了THP9-teosinte的氨基酸积累和种子蛋白.
结论:
- THP9 是一个关键的基因,负责高种子蛋白质在teosinte.
- THP9提高了玉米中的使用效率和氨基酸的积累.
- THP9为改善玉米营养价值和可持续农业提供了一个有希望的目标.
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