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大麦中硝酸根离子流入的调控：使用硝酸根离子的研究

Regulation of NO(3) Influx in Barley : Studies Using NO(3).

作者信息

Glass A D, Thompson R G, Bordeleau L

机构信息

University of British Columbia, Department of Botany, No. 3529 at 6270 University Boulevard, Vancouver, British Columbia, V6T 2B1, Canada.

出版信息

Plant Physiol. 1985 Feb;77(2):379-81. doi: 10.1104/pp.77.2.379.

DOI:10.1104/pp.77.2.379

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1064523/

Abstract

Short-term (10 minutes) measurements of plasmalemma NO(3) (-) influx (phi(oc)) into roots of intact barley plants were obtained using (13)NO(3) (-). In plants grown for 4 days at various NO(3) (-) levels (0.1, 0.2, 0.5 millimolar), phi(oc) was found to be independent of the level of NO(3) (-) pretreatment. Similarly, pretreatment with Cl(-) had no effect upon plasmalemma (13)NO(3) (-) influx. Plants grown in the complete absence of (13)NO(3) (-) (in CaSO(4) solutions) subsequently revealed influx values which were more than 50% lower than for plants grown in NO(3) (-). Based upon the documented effects of NO(3) (-) or Cl(-) pretreatments on net uptake of NO(3) (-), these observations suggest that negative feedback from vacuolar NO(3) (-) and/or Cl(-) acts at the tonoplast but not at the plasmalemma. When included in the influx medium, 0.5 millimolar Cl(-) was without effect upon (13)NO(3) (-) influx, but NH(4) (+) caused approximately 50% reduction of influx at this concentration.

摘要

使用¹³NO₃⁻对完整大麦植株根系的质膜NO₃⁻内流（φ(oc)）进行了短期（10分钟）测量。在不同NO₃⁻水平（0.1、0.2、0.5毫摩尔）下生长4天的植株中，发现φ(oc)与NO₃⁻预处理水平无关。同样，用Cl⁻预处理对质膜¹³NO₃⁻内流也没有影响。在完全不含¹³NO₃⁻（在CaSO₄溶液中）的条件下生长的植株，其随后显示的内流值比在含NO₃⁻条件下生长的植株低50%以上。基于已记录的NO₃⁻或Cl⁻预处理对NO₃⁻净吸收的影响，这些观察结果表明，液泡中NO₃⁻和/或Cl⁻的负反馈作用于液泡膜而非质膜。当在流入培养基中加入0.5毫摩尔Cl⁻时，对¹³NO₃⁻内流没有影响，但在此浓度下NH₄⁺会使内流减少约50%。