Enantioselective Separation of 4,8-DHT and Phytotoxicity of the Enantiomers on Various Plant Species
作者:Li Yang、Xiao-Yan Ma、Xiao Ruan、De-An Jiang、Cun-De Pan、Qiang Wang
DOI:10.3390/molecules21040528
日期:——
As a candidate for bioherbicide, 4,8-dihydroxy-1-tetralone (4,8-DHT) was isolated from Caryospora callicarpa epicarp and its two enantiomers, S-(+)-isosclerone and R-(−)-regiolone, were separated by chiral high-performance liquid chromatography (HPLC) on a Chiralcel OD column with chiral stationary phase (CSP)-coated cellulose-tris(3,5-dimethylphenylcarbamate). Then, the phytotoxicity of 4,8-DHT and its enantiomers toward the seeds germination and seedling growth of the five tested plant species, including lettuce (Latuca sativa), radish (Raphanus sativus), cucumber (Cucumis sativus), onion (Allium cepa), and wheat (Triticum aestivum), were investigated and the results indicated a hormesis at low concentration of 4,8-DHT and its enantiomers, but a retardant effect at high concentration. Between the two enantiomers of 4,8-DHT, the S-(+)-isosclerone was more toxic to seeds germination and seedling growth of the five tested plant species than the R-(−)-regiolone, and also the phytotoxicity of S-(+)-isosclerone varied with different plants. For example, S-(+)-isosclerone was the most active to seedling growth of lettuce, indicating that S-(+)-isosclerone had specific effects on different organisms. Thus, all of the chirality and concentration of 4,8-DHT, as well as the affected plant species, need to be taken into consideration in the development and utilization of 4,8-DHT.
作为生物除草剂的候选物质,从苦楝树外皮中分离出4,8-二羟基-1-四氢萘酮(4,8-DHT),并通过手性高效液相色谱(HPLC)在Chiralcel OD柱上分离出其两个对映体S-(+)-异石竹酮和R-(-)-雷吉酮。该柱上涂有手性固定相(CSP)的纤维素-三(3,5-二甲基苯基氨基甲酸酯)。然后,研究了4,8-DHT及其对映体对五种测试植物(包括莴苣(Latuca sativa)、萝卜(Raphanus sativus)、黄瓜(Cucumis sativus)、洋葱(Allium cepa)和小麦(Triticum aestivum))的种子发芽和幼苗生长的植物毒性,结果表明,低浓度的4,8-DHT及其对映体具有激素效应,而高浓度则具有抑制作用。在4,8-DHT的两个对映体中,S-(+)-异石竹酮对五种测试植物的种子发芽和幼苗生长的毒性比R-(-)-雷吉酮更强,而且S-(+)-异石竹酮的植物毒性也因植物而异。例如,S-(+)-异石竹酮对莴��