调控黄酮合成的主要MYB转录因子及其在苜蓿品质改良中的应用

摘要

黄酮类化合物中的缩合单宁(也称原花色素)含量是紫花苜蓿的重要品质性状，尽管黄酮化合物的合成、调控及其应用一直是植物天然产物领域的研究焦点，但黄酮化合物特别是缩合单宁的调控机制还不完全清楚。通过对模式植物中调控黄酮化合物合成的主要 MYB 型转录因子进行概述，特别是对苜蓿中参与缩合单宁调控的MYB 转录因子方面的研究及其应用进行综述，全面了解 MYB 转录因子调控黄酮化合物合成的机制，并为利用转录因子改良植物特别是苜蓿的品质提供有益参考。%The content of condensed tannins (also called proanthocyanidins)derived from flavonoids, is one of the key quality traits in forage crop alfalfa (Medicago sativa ). Although the biosynthesis,regu-lation and application of flavonoids have been one of the hotspots in plant natural products,the regulation mechanism of flavonoids,in particular condensed tannins,is still not well-understood. In the current re-view,the key MYB transcription factors involved in flavonoid pathway in model plants,in particular those involved in anthocyanin and proanthocyanidin pathway in Medicago were summarized,in attempts to deep understandings of MYB transcription factors in flavonoid biosynthesis as well as their applications in plant modification,with an emphasis on the quality improvement of alfalfa.