谷物中的双重复制的Rubisco激活酶基因显示出差异性的进化和对热应激的反应
Ragupathi Nagarajan1, Kaviraj Singh Kahlon1, Amita Mohan1
1Department of Crop and Soil Sciences, Washington State University, Pullman, WA, 99164, USA.
Plant molecular biology
|December 21, 2024
概括
热应激会影响光合作用,特别是Rubisco激活酶 (RCA). 一个特定于草的基因重复事件创造了两个具有明显热应激反应的RCA副本,帮助植物适应.
科学领域:
- 植物生物学 植物生物学
- 分子进化分子进化
- 光合作用研究研究 光合作用研究
背景情况:
- 热应激显著损害光合作用,主要是通过抑制Rubisco激活,由于热敏感的Rubisco激活酶 (RCA).
- 了解RCA对热应激反应的遗传基础对于提高作物弹性至关重要.
研究的目的:
- 为了研究在草家族中发生的并联重复事件后,RCA基因的进化模式和功能分歧.
- 阐明在热应力下RCA拷贝的差异表达的基础分子机制.
主要方法:
- 在各种植物物种中对RCA编码基因进行比较基因组学和序列分析.
- 在正常和热应激条件下,对转录和蛋白质水平进行基因表达分析.
- 推动者地区分析以确定监管要素,包括可转移的要素.
主要成果:
- RCA基因的草特异双重复制导致了两种具有不同的进化轨迹的副本:一种是保存的,一种是高度可变的.
- 保存的RCA副本在正常条件下显示出高表达,在热应力下下降,而可变副本在热应力下显示出增加的表达.
- 对促进区域的分析揭示了可转移元素与热反应元素在热诱导性RCA副本中的插入,特别是在玉米和中.
结论:
- 复制的RCA基因经历了新功能化,可变拷贝进化了特定的功能,以应对草的热应激.
- 在可变RCA副本的促进子区域内插入可转换元件可能是其热感应表达的原因.
- 这种分歧为了解各种草种中观察到的差异性耐热度提供了分子基础.
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