mono-hydroxylated GR24 analogues. Separate feeding experiments with each of the GR24 stereoisomers revealed that the hydroxylated products were derived from 2′-epi-GR24, an evidence of sterical recognition of the GR24 molecule by sorghum. Trans-4-hydroxy-GR24 isomers derived from all GR24 stereoisomers were detected in the exudates as minor metabolites. The synthetic hydroxy-GR24 isomers induced germination of Striga
通过
水培生长的高粱(高粱)对GR24(最广泛使用的合成strigolactone(SL))进行
生物转化)和羟基化GR24立体异构体的
生物活性进行了研究。使用
液相色谱-串联质谱和多反应监测(MRM)技术分析以前用GR24外消旋和非对映异构混合物饲喂的高粱根
提取物和渗出液,证实了GR24的吸收并建议将其转化为单羟基化产物。通过与一系列合成的单羟基化GR24类似物的色谱行为直接比较,在根
提取物和渗出物中鉴定出两种主要的GR24代谢物7-羟基-GR24和8-羟基-GR24。用每种GR24立体异构体进行的单独进料实验表明,羟基化产物衍生自2'- Epi -GR24,这是高粱对GR24分子进行空间识别的证据。反式在渗出液中检测到衍生自所有GR24立体异构体的-
4-羟基-GR24异构体为次要代谢物。合成的羟基-GR24异构体以C-8> C-7> C-6> C-5> C-4的降序排列诱导了月生Striga