Departments of Range Science and Plant Sciences, Texas A&M University, College Station, Texas 77843.
Plant Physiol. 1969 Jun;44(6):831-8. doi: 10.1104/pp.44.6.831.
Application of 4-amino-3,5,6-trichloropicolinic acid (picloram) to roots stimulated the production of ethylene in both mesquite [Prosopis juliflora (Swartz) DC. var. glandulosa (Torr.) Cockerell] and huisache [Acacia farnesiana (L.) Willd.] seedlings. Herbicide levels rose in tissues before we detected increased ethylene production. Rates of ethylene production by various parts of the plant paralleled herbicide concentrations. In both species, picloram caused loss of leaf movement and epinastic curvature of leaves and stems. Only huisache was defoliated by picloram. Rates of ethylene production increased before we observed any leaf movement or defoliation responses. Fumigation of plants with levels of ethylene, calculated to approximate those in herbicide-treated plants at the initial loss of leaf movement, caused the same symptoms as picloram treatment. The time sequence of ethylene fumigation and loss of the ability for leaf movement is compatible with the hypothesis that there is a causal relationship between picloram and ethylene production and loss of leaf movement.
4-氨基-3,5,6-三氯吡啶酸（草甘膦）施用于根部会刺激豆科金合欢属植物（Prosopis juliflora (Swartz) DC. var. glandulosa (Torr.) Cockerell）和牧豆树（Acacia farnesiana (L.) Willd.）幼苗产生乙烯。在我们检测到乙烯产量增加之前，除草剂水平就在组织中上升。植物各部分产生乙烯的速率与除草剂浓度平行。在这两个物种中，草甘膦都会导致叶片运动丧失和叶片及茎的内卷曲率。只有牧豆树被草甘膦落叶。在我们观察到任何叶片运动或落叶反应之前，乙烯的产生速率就增加了。用计算出的与最初叶片运动丧失时在除草剂处理植物中相近的乙烯水平熏蒸植物，会导致与草甘膦处理相同的症状。乙烯熏蒸和丧失叶片运动能力的时间顺序与草甘膦和乙烯产生以及叶片运动丧失之间存在因果关系的假说相符。
