Natural Products Chemistry Laboratory Department of Horticulture, Michigan State University, 48824, East Lansing, Michigan.
J Chem Ecol. 1991 Jan;17(1):9-19. doi: 10.1007/BF00994418.
Three allelochemicals from rye or its breakdown products were evaluated for activity on garden cress (Lepidum sativum L.), barnyardgrass [Echinochloa crus-galli (L.) Beauv.], cucumber (Cucumis sativus L.), and snap bean (Phaseolus vulgaris L.). 2,4-Dihydroxy-1,4(2H)-benzoxazin-3-one (DIBOA), 2(3H)-benzoxazolinone (BOA), and 2,2'-oxo-1,1'-azobenzene (AZOB) were all applied singly at 50, 100, and 200 ppm and in two- and three-way combinations each at 50 and 100 ppm. AZOB at 100 and 200 ppm produced 38-49% more inhibition than DIBOA, while combinations of BOA/ DIBOA, which contained AZOB at 100 ppm had 54-90% more inhibition when compared to DIBOA/BOA combinations. All combinations were slightly antagonistic to barnyardgrass, while several combinations caused a synergistic response to garden cress germination and growth. Cucumbers and snap beans exhibited both types of responses, depending on the allelochemical combination and application rate. The plant-produced benzoxazinones were more inhibitory to crops than weeds. Therefore, improved herbicidal selectivity would be expected if there were rapid transformation of the benzoxazinones to the microbially produced AZOB.
三种来自黑麦或其分解产物的化感物质在田间荠（Lepidum sativum L.）、稗草（Echinochloa crus-galli (L.) Beauv.）、黄瓜（Cucumis sativus L.）和菜豆（Phaseolus vulgaris L.）上的活性进行了评估。2,4-二羟基-1,4(2H)-苯并恶嗪-3-酮（DIBOA）、2(3H)-苯并恶唑啉酮（BOA）和 2,2'-氧代-1,1'-联苯（AZOB）均以 50、100 和 200 ppm 的浓度单独使用，以 50 和 100 ppm 的浓度以两种和三种组合方式使用。AZOB 在 100 和 200 ppm 时产生的抑制率比 DIBOA 高 38-49%，而当 BOA/DIBOA 组合中含有 100 ppm 的 AZOB 时，与 DIBOA/BOA 组合相比，抑制率增加了 54-90%。所有组合对稗草均略有拮抗作用，而几种组合对田间荠的发芽和生长产生协同作用。黄瓜和菜豆表现出这两种反应，具体取决于化感物质组合和应用率。植物产生的苯并恶嗪酮对作物的抑制作用比对杂草更强。因此，如果苯并恶嗪酮能迅速转化为微生物产生的 AZOB，预计除草选择性会得到提高。
