Davies Kevin M, Jibran Rubina, Zhou Yanfei, Albert Nick W, Brummell David A, Jordan Brian R, Bowman John L, Schwinn Kathy E
The New Zealand Institute for Plant and Food Research Limited, Palmerston North, New Zealand.
Faculty of Agriculture and Life Sciences, Lincoln University, Christchurch, New Zealand.
Front Plant Sci. 2020 Feb 4;11:7. doi: 10.3389/fpls.2020.00007. eCollection 2020.
The flavonoid pathway is one of the best characterized specialized metabolite pathways of plants. In angiosperms, the flavonoids have varied roles in assisting with tolerance to abiotic stress and are also key for signaling to pollinators and seed dispersal agents. The pathway is thought to be specific to land plants and to have arisen during the period of land colonization around 550-470 million years ago. In this review we consider current knowledge of the flavonoid pathway in the bryophytes, consisting of the liverworts, hornworts, and mosses. The pathway is less characterized for bryophytes than angiosperms, and the first genetic and molecular studies on bryophytes are finding both commonalities and significant differences in flavonoid biosynthesis and pathway regulation between angiosperms and bryophytes. This includes biosynthetic pathway branches specific to each plant group and the apparent complete absence of flavonoids from the hornworts.
类黄酮途径是植物中特征最为明确的特殊代谢途径之一。在被子植物中，类黄酮在协助耐受非生物胁迫方面具有多种作用，也是向传粉者和种子传播媒介发出信号的关键物质。该途径被认为是陆地植物所特有的，大约在5.5亿至4.7亿年前的陆地定殖时期出现。在这篇综述中，我们探讨了苔藓植物（包括叶苔、角苔和藓类）类黄酮途径的现有知识。与被子植物相比，苔藓植物的该途径特征较少，对苔藓植物的首次遗传和分子研究发现，被子植物和苔藓植物在类黄酮生物合成和途径调控方面既有共性也有显著差异。这包括每个植物类群特有的生物合成途径分支，以及角苔中明显完全不存在类黄酮的情况。
