Løkke H
Ecotoxicol Environ Saf. 1984 Aug;8(4):328-38. doi: 10.1016/0147-6513(84)90002-2.
The effect of 2,4-dichlorophenoxyacetic (2,4-D) acid in artificial rain at pH 3.3 was examined for young plants of rape (Brassica napus L.) and white mustard (Sinapis alba L.). Plants were treated in a closed simulation chamber system with varying CO2 supply (198-418 ppm). Single or daily showers were applied for 20-30 min at varying 2,4-D concentrations (0, 0.03, 0.1, 0.5, and 2.5 mg liter-1). The plants were sampled 5 days after the last treatment. Epinasty was observed for Brassica at 0.5 mg liter-1 and for Sinapis at 0.1 mg liter-1 2,4-D. Leaf to stem dry weight ratios increased with increasing CO2 concentrations in the air and decreased following single treatments with 0.5 or 2.5 mg liter-1 2,4-D in the rain. Dose-effect relationships are proposed for both plant species. Leaf dry matter weights per area unit decreased with increasing CO2 concentrations, but were not significantly affected by the 2,4-D treatments.
研究了pH值为3.3的人工降雨中2,4-二氯苯氧乙酸（2,4-D）对油菜（Brassica napus L.）和白芥（Sinapis alba L.）幼苗的影响。在一个封闭的模拟箱系统中，对植物进行不同二氧化碳供应（198 - 418 ppm）处理。以不同的2,4-D浓度（0、0.03、0.1、0.5和2.5毫克/升）进行单次或每日20 - 30分钟的喷淋。在最后一次处理5天后对植物进行采样。在2,4-D浓度为0.5毫克/升时，油菜出现了偏上性，在2,4-D浓度为0.1毫克/升时，白芥出现了偏上性。叶干重与茎干重的比值随着空气中二氧化碳浓度的增加而增加，而在降雨中单次施用0.5或2.5毫克/升的2,4-D后该比值下降。文中还给出了两种植物的剂量-效应关系。单位面积的叶干物质重量随着二氧化碳浓度的增加而降低，但2,4-D处理对其没有显著影响。
