The two enantiomers of flutriafol were resolved by means of high-performance liquid chromato-(graphy) with a cellulose derivative chiral stationary phase. The mobile phase was n-hexane, and five alkane (alcohols) were...The two enantiomers of flutriafol were resolved by means of high-performance liquid chromato-(graphy) with a cellulose derivative chiral stationary phase. The mobile phase was n-hexane, and five alkane (alcohols) were used as the polar modifier. The effects of the modifier and its concentration on the resolution were studied, and the influence of the temperature was also investigated. The results show that the separation factor could reach 1.41 at room temperature with 5%(volume fraction) isopropanol in the mobile phase. (Lower) column temperature resulted in a higher separation factor. The separation mechanism was primarily (discussed).展开更多
Late wilt, a severe vascular disease of maize caused by the fungus Harpophora maydis, is characterized by relatively rapid wilting of maize plants, before tasseling and until shortly before maturity. In Israel, the di...Late wilt, a severe vascular disease of maize caused by the fungus Harpophora maydis, is characterized by relatively rapid wilting of maize plants, before tasseling and until shortly before maturity. In Israel, the disease becomes a major problem in recent years. The pathogen currently controlled using varieties of maize has reduced sensitivity. In earlier work, we modified a molecular method for use as a diagnostic tool to evaluate the disease progress in field infested plants. Several fungicides suppressed H. maydis in vitro and in a detached root pathogenicity assay. Seedling pathogenicity assay enables us to identified H. maydis DNA in the host root and stem tissues 18 days after sowing in both susceptible and tolerant maize plants. Although the infested plants exhibited no wilt symptoms, their roots were significantly shorter in length. This seedling assay was used to demonstrate the suppressive effect of the fungicide Flutriafol on H. maydis virulence. The method of assaying the pathogen in a series of trials starting in a plate assay, followed by a detached root and resulting in a seedlings pathogenicity assay, using molecular and morphological approaches could be generalized to other plant pathogens.展开更多
文摘The two enantiomers of flutriafol were resolved by means of high-performance liquid chromato-(graphy) with a cellulose derivative chiral stationary phase. The mobile phase was n-hexane, and five alkane (alcohols) were used as the polar modifier. The effects of the modifier and its concentration on the resolution were studied, and the influence of the temperature was also investigated. The results show that the separation factor could reach 1.41 at room temperature with 5%(volume fraction) isopropanol in the mobile phase. (Lower) column temperature resulted in a higher separation factor. The separation mechanism was primarily (discussed).
文摘Late wilt, a severe vascular disease of maize caused by the fungus Harpophora maydis, is characterized by relatively rapid wilting of maize plants, before tasseling and until shortly before maturity. In Israel, the disease becomes a major problem in recent years. The pathogen currently controlled using varieties of maize has reduced sensitivity. In earlier work, we modified a molecular method for use as a diagnostic tool to evaluate the disease progress in field infested plants. Several fungicides suppressed H. maydis in vitro and in a detached root pathogenicity assay. Seedling pathogenicity assay enables us to identified H. maydis DNA in the host root and stem tissues 18 days after sowing in both susceptible and tolerant maize plants. Although the infested plants exhibited no wilt symptoms, their roots were significantly shorter in length. This seedling assay was used to demonstrate the suppressive effect of the fungicide Flutriafol on H. maydis virulence. The method of assaying the pathogen in a series of trials starting in a plate assay, followed by a detached root and resulting in a seedlings pathogenicity assay, using molecular and morphological approaches could be generalized to other plant pathogens.