Methods of genetically manipulating biology active 4′-O-methylated isoflavonoids have been found based upon the regiospecifity of isoflavone 7-OMT in vivo. Upon transformation and expression of an isoflavonoid O-methyltransferase gene, up-regulation of IOMT in the transgenic plants can be used to increase the accumulation of 4′-O-methylated isoflavonoid phytolalexins, providing for increased disease resistance to the plant. Similar methods can be used to increase accumulation of 4′-O-methylated isoflavonoid nutraceuticals in plants. For down-regulation of IOMT in plants that naturally make 4′O-isoflavonoid phytoalexins and 4′-O-methylated isoflavonoid nutraceuticals, IOMT gene sequences can be transformed in the antisense orientation.
根据异
黄酮 7-O
MT 在体内的专一性,人们发现了从
基因上操纵具有
生物活性的 4′-O-甲基化异
黄酮的方法。在转化和表达异
黄酮 O-甲基转移酶
基因后,转
基因植物中 IO
MT 的上调可用于增加 4′-O-甲基化异
黄酮植物毒素的积累,从而提高植物的抗病性。类似的方法也可用于增加植物中 4′-O-甲基化异黄
酮类营养保健品的积累。为了下调天然制造 4′O-异
黄酮植物
黄酮素和 4′-O-甲基化异
黄酮保健品的植物中的 IO
MT,可以反义方向转化 IO
MT 基因序列。