Bioactive Constituents Research USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N. University St., 61604, Peoria, Illinois.
J Chem Ecol. 1995 Feb;21(2):107-15. doi: 10.1007/BF02036645.
A flavonoid decomposition product that is present in peanut (Arachis hypogaea) shells, 5,7-dihydroxychromone (DHC), was found to inhibit the radial growth of cultures of the soil pathogenic fungiRhizoctonia solani andSclerotium rolfsii with I50 (the concentrations of DHC required to inhibit growth 50%) values of 18 and 26µM, respectively. Radicle elongation of velvetleaf, corn, peanut, and wheat was inhibited by DHC with I50 values of 30, 50, 65 and 200µM, respectively. DHC had no effect on the growth ofBradyrhizobium sp. at 10µM in medium containing low (1.0 g/liter) mannitol as the carbon source, although the related flavones luteolin and chrysin each promoted bacterial growth at 10µM 48 hr after inoculation. When tested in high (10.0 g/liter) mannitol medium, DHC initially inhibited growth ofBradyrhizobium sp., but 120 hr after inoculation the growth of all treatments were similar. These results suggest a role for DHC released from peanut shells in suppressing pathogenic fungal infection and competing plant growth but not forBradyrhizobium growth promotion.
存在于花生壳中的一种类黄酮分解产物 5,7-二羟基色原酮（DHC）被发现能抑制土壤病原菌立枯丝核菌和丝核菌的菌落径向生长，其 I50（抑制生长 50%所需的 DHC 浓度）值分别为 18 和 26µM。DHC 对菘蓝、玉米、花生和小麦的胚根伸长的抑制作用的 I50 值分别为 30、50、65 和 200µM。在含有低浓度（1.0 g/L）甘露醇作为碳源的培养基中，DHC 对 10µM 的慢生根瘤菌没有影响，尽管相关的类黄酮木犀草素和白杨黄素在接种后 48 小时均能以 10µM 的浓度促进细菌生长。在高浓度（10.0 g/L）甘露醇培养基中，DHC 最初抑制了慢生根瘤菌的生长，但在接种 120 小时后，所有处理的生长情况相似。这些结果表明，从花生壳中释放的 DHC 可能在抑制致病真菌感染和竞争植物生长方面发挥作用，但对慢生根瘤菌的生长促进作用不大。
