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揭开护卫细胞新陈代谢的黑暗面
Valéria F Lima1, Francisco Bruno S Freire1, Silvio A Cândido-Sobrinho1
1LabPlant, Departamento de Bioquímica e Biologia Molecular, Universidade Federal do Ceará, 60451-970, Fortaleza, Ceará, Brazil.
Plant physiology and biochemistry : PPB
|July 6, 2023
概括
护卫细胞利用烯酸碳化酶 (PEPc) 介导的暗 CO2 同化来推动葡萄糖生成和 TCA 循环. 光改变了代谢网络,增加了糖和TCA循环代谢物中的13C丰富.
科学领域:
- 植物生理学 植物生理学
- 植物新陈代谢 植物新陈代谢
- 生物化学 生物化学
背景情况:
- 护卫细胞表现出更高的基酸碳酸酶 (PEPc) 介导的深色CO2同化比中粒细胞.
- 警卫细胞中暗CO2同化激活的代谢途径在很大程度上是未知的.
- 在照明的防护细胞中,三碳酸 (TCA) 循环中的代谢流的调节尚不清楚.
研究的目的:
- 为了研究PEPc介导CO2同化后的烟草防护细胞中的代谢动态.
- 为了阐明暗CO2同化下游活跃的代谢途径.
- 了解照明的防护细胞中TCA循环和相关途径的调节.
主要方法:
- 使用了13C二碳酸盐标签实验.
- 在持续的黑暗中和从黑暗到光明的过渡期间,分析了烟草的防护细胞.
- 检查了各种代谢物的代谢变化和13C丰富.
主要成果:
- 大多数代谢变化在黑暗暴露和照明的护卫细胞之间是相似的.
- 照明改变了护卫细胞代谢网络结构,并增加了糖和TCA循环代谢物中的13C丰富.
- 糖的标签随着光线的增加而增加,而烟酸盐的标签是一致的;在照明下,pyruvate,succinate和glutamate显示13C丰富度增加.
结论:
- 在黑暗中以PEPc为媒介的CO2同化重定向了几个代谢途径,包括葡萄糖生成和TCA循环.
- 二氧化碳的吸收为葡萄糖生成,TCA循环和谷氨酸合成提供碳.
- 储存的酸盐和酸盐支持照明的护卫细胞的特定代谢需求.
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