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首页> 外文期刊>Genes & Genetic Systems >Expression profiles of respiratory components associated with mitochondrial biogenesis during germination and seedling growth under normal and restricted conditions in wheat.
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Expression profiles of respiratory components associated with mitochondrial biogenesis during germination and seedling growth under normal and restricted conditions in wheat.

机译:小麦在正常和受限条件下发芽和幼苗生长过程中与线粒体生物发生有关的呼吸器官的表达谱。

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摘要

Germination of plant embryo is a dynamic phase-changing process that is driven by a rapid increase in mitochondrial respiration. We studied the development of respiratory electron transport pathways and the profiles of their transcript and protein components during this critical period using wheat embryos. Oxygen consumption through both the cytochrome and alternative pathways increased rapidly upon imbibition. Quantitative RT-PCR analysis using specific primers and western blot analysis using specific antibodies suggested that this respiratory burst was supported both by the stored mRNA and protein components and ones synthesized de novo at least in the cytochrome pathway. Dry embryos also contained transcript and protein of alternative oxidase (AOX), but their levels remained constant during the studied period. By contrast, the alternative pathway capacity showed a marked increase when the cytochrome pathway was inhibited by antimycin A and this increase was associated with increased levels of AOX transcript and protein. Our results suggest that mitochondrial biogenesis is accompanied by sequential and differential gene expression and protein accumulation, and that AOX allows the complex I to continue to conserve energy thus to support embryo germination and initial seedling growth in wheat when the cytochrome pathway is restricted.
机译:植物胚的萌发是一个动态的相变过程,它由线粒体呼吸的快速增加驱动。我们研究了在这个关键时期使用小麦胚的呼吸电子运输途径的发展及其转录和蛋白质成分的概况。吸收后,通过细胞色素和替代途径消耗的氧气迅速增加。使用特异性引物的定量RT-PCR分析和使用特异性抗体的western印迹分析表明,这种呼吸爆发由存储的mRNA和蛋白质成分以及至少在细胞色素途径中从头合成的分子支持。干胚胎也含有替代氧化酶(AOX)的转录本和蛋白质,但在研究期间它们的水平保持恒定。相比之下,当细胞色素途径被抗霉素A抑制时,替代途径的容量显示出明显的增加,并且这种增加与AOX转录物和蛋白质水平的增加有关。我们的结果表明,线粒体的生物发生伴随着顺序和差异基因的表达以及蛋白质的积累,并且AOX允许复合体I继续保存能量,从而在细胞色素途径受到限制时支持小麦的胚发芽和初始幼苗生长。

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