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Altered gene expression by sedaxane increases PSII efficiency, photosynthesis and growth and improves tolerance to drought in wheat seedlings

机译:sedaxane改变基因表达可提高PSII效率,光合作用和生长并提高小麦幼苗的耐旱性

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摘要

Succinate dehydrogenase inhibitor (SDHI) fungicides have been shown to increase PSII efficiency and photosynthesis under drought stress in the absence of disease to enhance the biomass and yield of winter wheat. However, the molecular mechanism of improved photosynthetic efficiency observed in SDHI-treated wheat has not been previously elucidated. Here we used a combination of chlorophyll fluorescence, gas exchange and gene expression analysis, to aid our understanding of the basis of the physiological responses of wheat seedlings under drought conditions to sedaxane, a novel SDHI seed treatment. We show that sedaxane increased the efficiency of PSII photochemistry, reduced non-photochemical quenching and improved the photosynthesis and biomass in wheat correlating with systemic changes in the expression of genes involved in defense, chlorophyll synthesis and cell wall modification. We applied a coexpression network-based approach using differentially expressed genes of leaves, roots and pregerminated seeds from our wheat array datasets to identify the most important hub genes, with top ranked correlation (higher gene association value and z-score) involved in cell wall expansion and strengthening, wax and pigment biosynthesis and defense. The results indicate that sedaxane confers tolerant responses of wheat plants grown under drought conditions by redirecting metabolites from defense/stress responses towards growth and adaptive development.
机译:琥珀酸脱氢酶抑制剂(SDHI)杀真菌剂已显示出在无病情况下提高干旱胁迫下PSII效率和光合作用的能力,从而增强了冬小麦的生物量和产量。然而,先前尚未阐明在SDHI处理的小麦中观察到的提高光合作用效率的分子机理。在这里,我们结合使用叶绿素荧光,气体交换和基因表达分析,以帮助我们了解干旱条件下小麦幼苗对新SDHI种子处理剂sedaxane的生理反应基础。我们表明,sedaxane提高了PSII光化学的效率,减少了非光化学猝灭,并改善了小麦的光合作用和生物量,与参与防御,叶绿素合成和细胞壁修饰的基因表达的系统变化有关。我们使用基于共表达网络的方法,利用小麦阵列数据集中叶,根和发芽种子的差异表达基因,鉴定出最重要的中心基因,并在细胞壁中涉及相关性最高的基因(较高的基因关联值和z评分)膨胀和增强,蜡和色素的生物合成和防御。结果表明,七叶烷通过将代谢产物从防御/胁迫响应转向生长和适应性发育,赋予了在干旱条件下生长的小麦植物的耐受性响应。

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