Flavonoids are polyphenolic compounds found in all vascular and non-vascular plants. Although nonessential for plant growth and development, flavonoids have species-specific roles in nodulation, fertility, defense and UV protection. Flavonoids have been shown to modulate transport of the phytohormone auxin in addition to auxin-dependent tropic responses. However, flavonoids are not essential regulators of these processes because transport and tropic responses occur in their absence. Flavonoids modulate the activity of auxin-transporting P-glycoproteins and seem to modulate the activity of regulatory proteins such as phosphatases and kinases. Phylogenetic analysis suggests that auxin transport mechanisms evolved in the presence of flavonoid compounds produced for the scavenging of reactive oxygen species and defense from herbivores and pathogens.

中文翻译：

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类黄酮和生长素运输：调节剂还是调节剂？

类黄酮是在所有维管植物和非维管植物中发现的多酚化合物。尽管类黄酮对植物的生长和发育无关紧要，但它们在结瘤，肥力，防御和紫外线防护方面具有特定物种的作用。黄酮类化合物已显示除了生长素依赖性的热带反应外，还可以调节植物激素生长素的转运。但是，类黄酮不是这些过程的必需调节剂，因为在它们不存在时会发生运输和热带反应。类黄酮调节生长素运输的P-糖蛋白的活性，并且似乎调节诸如磷酸酶和激酶的调节蛋白的活性。系统发育分析表明，生长素运输机制是在存在类黄酮化合物的情况下发展的，该类黄酮化合物用于清除活性氧并防御草食动物和病原体。