Fungicidal activity of three putrescine analogues

摘要

AbstractThe synthetic putrescine analogues (E)‐N,N,N′,N′‐tetraethyl‐l,4‐diaminobut‐2‐ene(E‐TED), the (Z)‐isomer (Z‐TED) and (E)‐N,N‐dimethyl‐1,4‐diaminobut‐2‐ene(E‐DMD) were prepared as their salts, and controlled five important crop pathogens (Erysiphe graminisDC f.sp.hordeiMarchal,Uromyces viciae‐fabae(Pers.) Schroet,Botrytis fabaeSardina,Podosphaera leucotricha(Ell.Ev.) Salm. andPhytophthora infestans(Mont.) De Bary). E‐TED was also effectivein vitro, with growth ofP. infestans and Pyrenophora avenaeItoKuribay completely inhibited at 1800 and 360 mg litre−1respectively. WhenP. avencewas grown in the presence of 180 mg E‐TED litre−1, there were significant reducuons in putrescine and spermidine concentrations (58 and 35 respectively). An apparent increase in ornithine decarboxylase activity and a decrease inS‐adenosylmethionine decarboxylase activity inP. avenaeexposed to E‐TED at 36 mg litre−1were not statistically significant. Diamine oxidase activity r