文献类型： 外文期刊

作者： Li, Ya ¹ ; Li, Guangda ¹ ; Yu, Haitao ² ; Jiao, Xingzhi ¹ ; Gao, Kun ¹ ;

作者机构： 1.Lanzhou Univ, Coll Chem & Chem Engn, State Key Lab Appl Organ Chem, Lanzhou 730000, Gansu, Peoples R China

2.Gansu Acad Agr Sci, Inst Plant Protect, Lanzhou 730070, Gansu, Peoples R China

关键词： alfalfa; phenolic compounds; antifungal activities; Uromyces striatus; phytochemistry; biological activity

期刊名称：CHEMISTRY & BIODIVERSITY （ 影响因子：2.408； 五年影响因子：2.351 ）

ISSN： 1612-1872

年卷期： 2018 年 15 卷 12 期

页码：

收录情况： SCI

摘要： Fungal pathogens constitute a severe yield-limiting factor for the pasture crop alfalfa (Medicago sativa L.). Eleven phenolic compounds, including a new isoflavane, were isolated from the Uromyces striatus Schroet. infected alfalfa. The effect of infection with U. striatus Schroet. on the phytochemical profile of alfalfa was investigated using ultra-performance liquid chromatography (UPLC), and the antifungal properties of isolated compounds against a range of pathogens were tested. It was found that the contents of most of the isolated compounds in U. striatus infected alfalfa were higher than those in healthy alfalfa. Compounds 1-5 exhibited a moderate inhibitory activity against Curvularia lunata with 40.14 +/- 1.63 %, 48.03 +/- 1.22 %, 57.54 +/- 1.18 %, 50.10 +/- 1.56 %, and 61.54 +/- 2.14 % inhibition ratio at the concentration of 50 mu g/mL. Compounds 3 and 5 showed a weak inhibitory activity against Fusarium graminearum with the EC50 values of 104.2 +/- 2.66 and 123.0 +/- 1.23 mu g/mL, and a moderate inhibitory activity against Bipolaris sorokinianum with the EC50 values of 39.1 +/- 2.05 and 95.0 +/- 1.01 mu g/mL, respectively. In pot experiments with wheat, compounds 1-5 possessed desirable protective efficacy of over 80 % and curative effectiveness of over 50 % against Puccinia striiformis f. sp. tritici at a concentration of 0.5 mg/mL