Schreiber Lukas, Schönherr Jörg
Physiologische Ökologie, Fachbereich Biologie, Universität Kaiserslautern, Erwin-Schrödinger-Str., Ban 22, D-6750 Kaiserslautern, Germany.
Lehrstuhl fur Botanik, Technische Universität München, Arcisstraβe 21, D-8000 München 2, Germany.
New Phytol. 1993 Mar;123(3):547-554. doi: 10.1111/j.1469-8137.1993.tb03767.x.
The distribution of pentachlorophenol and 2,4-dichlorophenoxyacetic acid in conifer needles was studied following uptake from aqueous solutions for up to 21 h. Desorption kinetics revealed two compartments (C j and C ) in which organics were sorbed reversibly and one compartment (C ) from which organics could not be desorbed. Reversible sorption proceeded very rapidly (less than 1 h for equilibration) and was made up of sorption to the surfaces of cuticular waxes and sorption in waxes and cutin. C appears to be identical with the apoplast and the symplast of needles. Penetration into C proceeded slowly and remained steady up to 21 h (longer periods not tried). The distribution of organics between the three compartments varied with time of loading and depended on plant species and properties of solutes. Data are discussed in relation to methods of exposure monitoring.
研究了针叶树针叶从水溶液中吸收五氯苯酚和2,4-二氯苯氧乙酸长达21小时后的分布情况。解吸动力学揭示了两个有机物质可逆吸附的隔室（C j 和C ）以及一个有机物质无法解吸的隔室（C ）。可逆吸附进行得非常迅速（平衡时间少于1小时），由吸附到角质蜡表面以及在蜡和角质中的吸附组成。C 似乎与针叶的质外体和共质体相同。进入C 的渗透过程缓慢，直至21小时保持稳定（未尝试更长时间）。三个隔室之间有机物质的分布随加载时间而变化，并取决于植物种类和溶质性质。结合暴露监测方法对数据进行了讨论。
