在中性和性外部pH值下,花内部的微流体通信
Alexander A Bulychev1, Natalia A Krupenina1
1Department of Biophysics, Faculty of Biology, Lomonosov Moscow State University, Moscow, Russia.
Physiologia plantarum
|April 10, 2025
概括
查拉细胞中的细胞质流运输代谢物,影响叶绿素光. 高pH条件改变了这种运输,揭示了新的代谢物相互作用,并增强了非光化学火 (NPQ).
科学领域:
- 植物细胞生理学植物细胞生理学
- 光合作用研究研究光合作用.
- 细胞内运输机制 细胞内运输机制
背景情况:
- 细胞质流 (循环) 促进植物细胞的细胞内通信,克服扩散限制.
- 循环溶解平滑了由光变化和外部pH引起的度梯度.
- 在查拉细胞中,光诱导的还原等效物通过流传输,影响叶绿素光 (F').
研究的目的:
- 为了研究高外部pH对代谢物运输和Chara细胞中叶绿素光效应的影响.
- 了解循环溶解运输的代谢物如何在性条件下与叶绿体相互作用.
- 阐明作用电位生成在不同pH下非光化学火 (NPQ) 的作用.
主要方法:
- 使用PAM微型光计测量叶绿素光度 (F'和F'm).
- 查拉内节细胞被暴露在高pH值溶液 (9.5) 中,以模仿天然的性区域.
- 测量是在模拟的光线条件下进行的,并在动作潜能生成期间进行测量.
主要成果:
- 在性条件下的 хлоропласт对循环溶解运输的还原剂等价物和一种灭光的新代谢物做出了反应.
- 不同代谢物的联合作用似乎抑制了微流体相互作用.
- 动能生成在高pH时诱导强烈的非光化学火 (NPQ),而不是在中性pH时.
结论:
- 高的外部pH值会改变细胞内代谢物运输和叶绿体反应.
- 在高pH下限制CO2可能会诱导电子运输重排,增加背景NPQ.
- 叶绿体对通过细胞质流传递的过氧化 (H2O2) 在高pH和光应激下变得更加敏感.
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