ZmCCD8通过strigolactone信号调节玉米核中的糖和氨基酸积累
Yanting Zhong1,2, Yongqi Wang1, Xiaoying Pan1
1State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, China Agricultural University, Beijing, China.
Plant biotechnology journal
|November 10, 2024
概括
斯特里戈拉克顿 (SL) 信号通过控制糖和氨基酸积累来调节玉米核的生长. 操纵SL生物合成基因,如CAROTENOID CLEAVAGE DIOXYGENASE 8 (CCD8),会影响耳朵的大小和营养含量,从而有可能改善作物.
科学领域:
- 植物分子生物学 植物分子生物学
- 植物生理学作物生理学
- 农业生物技术 农业生物技术
背景情况:
- 在谷物谷物中碳 (糖) 和 (氨基酸) 积累的协调控制是不太了解的.
- 斯特里戈拉克顿 (SLs) 是植物激素,在发育过程中具有已知的作用,但它们在谷物营养积累中的特定功能尚不清楚.
研究的目的:
- 阐明strigolactone (SL) 信号在玉米核中的糖糖和氨基酸积累的协调调节中的作用.
- 确定关键的基因和调节途径,参与SL介导的营养分离在开发玉米粒.
主要方法:
- 在玉米中基因操纵strigolactone生物合成 (ZmCCD8) 和信号 (DWARF 14B) 基因.
- 对转基因和突变系中的核生长,糖糖和氨基酸含量的分析.
- 转录基因分析以确定下游监管目标,包括转录因子 (ZmMYB42,ZmMYB63) 和营养物质运输体 (ZmSWEETs,ZmLHT14).
主要成果:
- 过度表达ZmCCD8增加了内核大小,增加了糖糖和氨基酸的积累,而功能丧失突变减少了这些参数.
- 操纵ZmCCD8改变了转录因子ZmMYB42和ZmMYB63的表达,这些转录因子负面调节糖糖和氨基酸载体.
- 调节SL信号元件直接影响了关键营养物质运输体的表达,影响了核糖和氨基酸水平.
结论:
- 已经确定了一种新型的strigolactone (SL) 信号通路,该通路调节了玉米核中的糖糖和氨基酸积累.
- ZmCCD8及其下游目标,包括ZmMYB42,ZmMYB63,ZmSWEETs和ZmLHT14,是这个途径的关键组成部分.
- ZmCCD8的遗传变异与耳朵和子直径有关,这表明可以提高产量和使用效率.
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