氯化汞对番茄根系导水率的影响（通道介导的水分运输途径的证据）
Effects of Mercuric Chloride on the Hydraulic Conductivity of Tomato Root Systems (Evidence for a Channel-Mediated Water Pathway).
作者信息
Maggio A., Joly R. J.
机构信息
Department of Horticulture, Purdue University, West Lafayette, Indiana 47907-1165.
出版信息
Plant Physiol. 1995 Sep;109(1):331-335. doi: 10.1104/pp.109.1.331.
Abstract
A pressure-flux approach was used to evaluate the effects of HgCl2 on water transport in tomato (Lycopersicon esculentum) roots. Addition of HgCl2 to a root-bathing solution caused a large and rapid reduction in pressure-induced root water flux; the inhibition was largely reversible upon addition of [beta]-mercaptoethanol. Root system hydraulic conductivity was reduced by 57%. There was no difference between treatments in the K+ concentration in xylem exudate. The results are consistent with the presence of a protein-mediated path for transmembrane water flow in tomato roots.
摘要
采用压力-通量法评估HgCl₂对番茄（Lycopersicon esculentum）根系水分运输的影响。向根系浸泡溶液中添加HgCl₂会导致压力诱导的根系水分通量大幅快速降低；加入β-巯基乙醇后，这种抑制作用在很大程度上是可逆的。根系导水率降低了57%。各处理间木质部渗出液中的K⁺浓度没有差异。这些结果与番茄根系中存在蛋白质介导的跨膜水分流动途径一致。
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