类黄酮代谢途径与棉花纤维发育

Flavonoid Pathway in Cotton Fiber Development

棉花纤维是最重要的天然纤维,育成五彩缤纷且品质优良的彩色棉花一直是棉花遗传育种研究的一个重要目标.类黄酮是植物重要的次生代谢物质,与色素形成相关.本文综述了类黄酮代谢途径与棉花纤维发育的研究进展:棕色棉纤维色素物质可能主要是氧化的原花青素;棉花人工驯化过程中,类黄酮代谢途径在白色棉花中下调,但白色棉花表达谱数据显示,类黄酮代谢相关基因在纤维发育过程中仍然非常活跃;一般认为,类黄酮含量与纤维品质负相关,柚皮素和二氢山柰酚可能是抑制纤维发育的主要类黄酮;类黄酮代谢和木质素代谢有共同的代谢前体,木质素代谢相关基因在纤维发育过程中也很活跃,有效调控类黄酮代谢的同时,协调木质素代谢的水平可能会促进纤维发育.

Cotton fiber is the most important natural fiber. Development of colorful cotton varieties with super quality has always been an important goal of cotton genetics and breeding research. Flavonoids that are associated with the formation of pigment are important plant secondary metabolites. In this review, we describe the advances of flavonoid pathway in cotton fiber: brown pigments in cotton fiber may mainly belong to proanthocyanidins. The flavonoid pathway is down-regulated in white cotton with domestication process, but in white cotton, gene expression profiling data show that genes involved in flavonoid pathway are still very active in fiber development. It was generally believed that flavonoids negatively correlated with fiber quality, naringenin and dihydrokaempferol may inhibit the development of fiber. Flavonoid metabolism and lignin metabolism have common metabolic precursors and genes involved in lignin metabolism are also very active in fiber development, and effective regulation of the metabolism of flavonoids, meanwhile coordinating lignin metabolism, may contribute to fiber development.