Mizutani Plant Ecochemicals Project, ERATO, Research Development Corporation of Japan Eniwa Research Center, 3-1-1 Meguminokita Eniwa, 061-13, Hokkaido, Japan.
J Chem Ecol. 1993 Aug;19(8):1775-87. doi: 10.1007/BF00982307.
Phenolic compounds have been identified as the most common allelochemicals produced by higher plants. Inhibitions of cinnamic acid, its related phenolic derivatives, and abscisic acid (ABA) on seedling growth and seed germination of lettuce were studied.trans-Cinnamic acid, ando-,m-, andp-coumaric acids inhibited the growth of etiolated seedlings of lettuce at concentrations higher than 10(-4) M and seed germination above 10(-3) M. Coumarin inhibited seedling growth and seed germination at 10(-5) M or above. Chlorogenic acid inhibited seedling growth above 10(-4) M, but did not inhibit seed germination at 10(-5)-5×10(-3) M. Low concentrations (below 10(-3) M) of caffeic and ferulic acids promoted the elongation of hypocotyls, but higher concentrations (over 10(-3) M) inhibited seedling growth and seed germination. These phenolic compounds and abscisic acid had additive inhibitory effects both on seedling growth and seed germination. The inhibition on lettuce was reversed by caffeic and ferulic acids at concentrations lower than 10(-3) M except for the inhibition of germination by coumarin. These results suggest that in naturetrans-cinnamic acid,o-, m-, p-coumaric acids, coumarin, and chlorogenic acid inhibit plant growth regardless of their concentration. However, caffeic and ferulic acids can either promote or inhibit plant growth according to their concentration.
酚类化合物已被确定为高等植物产生的最常见的化感物质。研究了肉桂酸、其相关酚类衍生物和脱落酸（ABA）对生菜幼苗生长和种子萌发的抑制作用。反式肉桂酸、邻、间和对香豆酸在浓度高于 10(-4) M 时抑制生菜黄化幼苗的生长，在浓度高于 10(-3) M 时抑制种子萌发。香豆素在 10(-5) M 或更高浓度时抑制幼苗生长和种子萌发。绿原酸在浓度高于 10(-4) M 时抑制幼苗生长，但在 10(-5)-5×10(-3) M 时不抑制种子萌发。低浓度（低于 10(-3) M）的咖啡酸和阿魏酸促进下胚轴伸长，但高浓度（高于 10(-3) M）抑制幼苗生长和种子萌发。这些酚类化合物和脱落酸对幼苗生长和种子萌发均具有相加抑制作用。除香豆素对萌发的抑制作用外，咖啡酸和阿魏酸在低于 10(-3) M 的浓度下可逆转对生菜的抑制作用。这些结果表明，在自然界中，反式肉桂酸、邻、间和对香豆酸、香豆素和绿原酸无论浓度如何都会抑制植物生长。然而，咖啡酸和阿魏酸可以根据其浓度促进或抑制植物生长。
