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首页> 外文期刊>Journal of Agricultural and Food Chemistry >Direct Effects of Physcion, Chrysophanol, Emodin, and Pachybasin on Germination and Appressorium Formation of the Barley (Hordeum vulgare L.) Powdery Mildew Fungus Blumeria graminis f. sp hordei (DC.) Speer
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Direct Effects of Physcion, Chrysophanol, Emodin, and Pachybasin on Germination and Appressorium Formation of the Barley (Hordeum vulgare L.) Powdery Mildew Fungus Blumeria graminis f. sp hordei (DC.) Speer

机译：生理酶，氯氰酸甲醇，大黄素和肉豆苷对大麦（Hordeum Vulgare L.）粉末状霉菌真菌Blumeria Graminis F的直接影响。 SP HORDEI（DC）SPEER

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摘要

Several anthraquinone derivatives are active components of fungicidal formulations particularly effective against powdery mildew fungi. The antimildew effect of compounds such as physcion and chrysophanol is largely attributed to host plant defense induction. However, so far a direct fungistatic/fungicidal effect of anthraquinone derivatives on powdery mildew fungi has not been unequivocally demonstrated. By applying a Formvar-based in vitro system we demonstrate a direct, dose-dependent effect of physcion, chrysophanol, emodin, and pachybasin on conidial germination and appressorium formation of Blumeria graminis f. sp. hordei (DC.) Speer, the causative agent of barley (Hordeum vulgare L.) powdery mildew. Physcion was the most effective among the tested compounds. At higher doses, physcion mainly inhibited conidial germination. At lower rates, however, a distinct interference with appressorium formation became discernible. Physcion and others may act by modulating both the infection capacity of the powdery mildew pathogen and host plant defense. Our results suggest a specific arrangement of substituents at the anthraquinone backbone structure being crucial for the direct antimildew effect.
机译：几种Anthraquinone衍生物是杀菌剂配方的活性成分，特别是对粉末状霉菌真菌有效的。诸如物理和汉霉甲酚等化合物的抗度效应主要归因于宿主植物防御诱导。然而，到目前为止，Anthraquinone衍生物对粉状霉菌真菌的直接稳定性/杀菌效果并未明确证明。通过应用基于FormVar的体外系统，我们证明了Phyclia Graminis F的分析萌发和植入形成的直接，剂量依赖性效果。 sp。 HORDEI（DC）SPEER，大麦的致病因子（Hordeum Vulgare L.）粉状霉菌。 Physcion是测试化合物中最有效的。在较高剂量，物理液主要抑制分析萌发。然而，在较低的速率下，与孕产性形成的不同干扰变得可辨别。 physcion和其他人可以通过调节白粉病病原体和宿主植物防御的感染能力来采取行动。我们的研究结果表明，蒽醌骨干结构中取代基的特定布置对于直接反抗性效应至关重要。

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