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首页> 外文期刊>Journal of Experimental Botany >Glutathione redox state plays a key role in flower development and pollen vigour
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Glutathione redox state plays a key role in flower development and pollen vigour

机译:谷胱甘肽氧化还原国家在花开发和花粉活力中起着关键作用

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The importance of the glutathione pool in the development of reproductive tissues and in pollen tube growth was investigated in wild-type (WT) Arabidopsis thaliana, a reporter line expressing redox-sensitive green fluorescent protein (roGFP2), and a glutathione-deficient cad2-1 mutant (cad2-1/roGFP2). The cad2-1/roGFP2 flowers had significantly less reduced glutathione (GSH) and more glutathione disulfide (GSSG) than WT or roGFP2 flowers. The stigma, style, anther, germinated pollen grains, and pollen tubes of roGFP2 flowers had a low degree of oxidation. However, these tissues were more oxidized in cad2-1/roGFP2 flowers than the roGFP2 controls. The ungerminated pollen grains were significantly more oxidized than the germinated pollen grains, indicating that the pollen cells become reduced upon the transition from the quiescent to the metabolically active state during germination. The germination percentage was lower in cad2-1/roGFP2 pollen and pollen tube growth arrested earlier than in roGFP2 pollen, demonstrating that increased cellular reduction is essential for pollen tube growth. These findings establish that ungerminated pollen grains exist in a relatively oxidized state compared with germinating pollen grains. Moreover, failure to accumulate glutathione and maintain a high GSH/GSSG ratio has a strong negative effect on pollen germination.
机译:在野生型(WT)Arabidopsis Thaliana中,研究了表达氧化还原敏感的绿色荧光蛋白(Rogfp2)的报告系和谷胱甘肽缺陷的CAD2- 1突变体(CAD2-1 / ROGFP2)。 CAD2-1 / ROGFP2花的谷胱甘肽(GSH)和更多的谷胱甘肽二硫化物(GSSG)显着降低,而不是WT或ROGFP2花。 Rogfp2花的耻辱,风格,花药,发芽的花粉和花粉管具有低氧化程度。然而,这些组织在CAD2-1 / ROGFP2花中更氧化而不是ROGFP2对照。未渗透的花粉晶粒比发芽的花粉晶粒显着更加氧化,表明花粉细胞在从萌芽期间从静态转变到代谢活性状态的转变。 CAD2-1 / ROGFP2花粉中的发芽率较低,花粉管生长早于Rogfp2花粉,表明细胞减少增加对于花粉管生长至关重要。与发芽花粉颗粒相比,这些发现设定了未渗透的花粉颗粒存在于相对氧化的状态。此外,未能积累谷胱甘肽并保持高GSH / GSSG的比率对花粉萌发具有强烈的负面影响。

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