The role of nitrate reduction in the anoxic metabolism of roots I. Characterization of root morphology and normoxic metabolism of wild type tobacco and a transformant lacking root nitrate reductase

M. Stoimenova; R. Hänsch; R. Mendel; H. Gimmler; W.M. Kaiser

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The role of nitrate reduction in the anoxic metabolism of roots I. Characterization of root morphology and normoxic metabolism of wild type tobacco and a transformant lacking root nitrate reductase

机译：硝酸盐还原在根系缺氧代谢中的作用I.野生型烟草和缺乏根系硝酸盐还原酶的转化体的根系形态和常氧代谢的表征

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Two tobacco lines with (Nicotiana tabacum cv. Gatersleben, WT) or without (transformant LNR-H) nitrate reductase in roots were chosen as model systems to re-evaluate the role of root nitrate reduction for survival of anoxia. In this first paper, the two hydroponically grown lines were compared with respect to their root morphology, root respiration and the root content of inorganic cations, anions, and metabolites. Leaf transpiration in relation to root morphology was also determined. In comparison to WT roots containing NR, the NR-free LNR-H transformants had slightly shorter and thicker roots with a lower root surface area per g leaf FW. Consistent with that, LNR-H leaves had lower transpiration rates than WT. LNR-H-roots also showed consistently higher respiration and higher contents of ATP, starch and hexose monophosphates than WT roots. Concentrations of free sugars were only slightly higher in LNR-H roots. Total soluble protein content was identical in both lines, whereas amino acids were higher in LNR-H. Contents of major inorganic cations and anions were also almost identical in both lines. We conclude that WT versus LNR-H plants are a suitable tool to re-evaluate the role of nitrate reduction in flooding tolerance.

机译：选择两个根系中有（Nicotiana tabacum cv。Gatersleben，WT）或不具有（转化子LNR-H）硝酸盐还原酶的烟草系作为模型系统，以重新评估减少硝酸盐对缺氧存活的作用。在第一篇论文中，比较了两个水培生长的品系的根系形态，根系呼吸作用以及无机阳离子，阴离子和代谢产物的根系含量。还确定了与根系形态相关的叶片蒸腾作用。与含有NR的野生根相比，无NR的LNR-H转化子具有稍短和较粗的根，每克叶片FW具有较低的根表面积。与此相一致，LNR-H叶片的蒸腾速率低于野生型。与野生根相比，LNR-H根还显示出持续较高的呼吸作用和更高的ATP，淀粉和己糖单磷酸含量。 LNR-H根中游离糖的浓度仅略高。在两个品系中，总可溶性蛋白含量相同，而在LNR-H中，氨基酸较高。两条线中主要无机阳离子和阴离子的含量也几乎相同。我们得出的结论是，WT和LNR-H植物是重新评估硝酸盐还原在抗洪能力中的作用的合适工具。

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《Plant and Soil》 |2003年第1期|145-153|共9页
作者
M. Stoimenova; R. Hänsch; R. Mendel; H. Gimmler; W.M. Kaiser;
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作者单位

Lehrstuhl Botanik I Julius-von-Sachs-Institut für Biowissenschaften Universität Würzburg;

Botanisches Institut Technische Universität;

Botanisches Institut Technische Universität;

Lehrstuhl Botanik I Julius-von-Sachs-Institut für Biowissenschaften Universität Würzburg;

Lehrstuhl Botanik I Julius-von-Sachs-Institut für Biowissenschaften Universität Würzburg;

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正文语种 eng
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关键词
metabolism; nitrate reductase; root; root morphology; tobacco;

机译：代谢;硝酸还原酶;根;根形态;烟草;

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1. The role of nitrate reduction in the anoxic metabolism of roots - I. Characterization of root morphology and normoxic metabolism of wild type tobacco and a transformant lacking root nitrate reductase [J] . Stoimenova M, Hansch R, Mendel R, Plant and Soil . 2003,第1期

机译：硝酸盐还原在根系缺氧代谢中的作用-I.野生型烟草和缺乏根系硝酸盐还原酶的转化体的根系形态和常氧代谢的表征
2. The role of nitrate reduction in the anoxic metabolism of roots II. Anoxic metabolism of tobacco roots with or without nitrate reductase activity [J] . M. Stoimenova, I.G.L. Libourel, R.G. Ratcliffe, Plant and Soil . 2003,第1期

机译：硝酸盐还原在根的缺氧代谢中的作用II。具有或不具有硝酸还原酶活性的烟草根的缺氧代谢
3. The role of nitrate reduction in the anoxic metabolism of roots - II. Anoxic metabolism of tobacco roots with or without nitrate reductase activity [J] . Stoimenova M, Libourel IGL, Ratcliffe RG, Plant and Soil . 2003,第1期

机译：硝酸盐还原在根的缺氧代谢中的作用-II。具有或不具有硝酸还原酶活性的烟草根的缺氧代谢
4. Nitrate reductase in roots: succinate- and NADH-dependent plasma membrane-bound forms [C] . Christine Stohr, Stefanie Wienkoop, Wolfram R. Ullrich International Symposium on Structure and Function of Roots . 2001

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5. The role of nitrate and carbohydrates in modulating the partitioning of nitrate assimilation between leaves and roots in perennial ryegrass (Lolium perenne L.). [D] . Bushoven, John T. 2003

机译：硝酸盐和碳水化合物在调节多年生黑麦草（Lolium perenne L.）叶和根之间的硝酸盐同化分配中的作用。
6. Purification and Characterization of NAD(P)H:Nitrate Reductase and NADH:Nitrate Reductase from Corn Roots [O] . Margaret G. Redinbaugh, Wilbur H. Campbell 1981

机译：玉米根中NAD（P）H：硝酸还原酶和NADH：硝酸还原酶的纯化与表征
7. Elevated pCO2 favours nitrate reduction in the roots of wild-type tobacco (Nicotiana tabacum cv. Gat.) and significantly alters N-metabolism in transformants lacking functional nitrate reductase in the roots [O] . J. Kruse 2002

机译：升高的PCO2利用野生型烟草根系的硝酸盐硝酸盐（尼古拉纳塔巴氏菌CV.），并且在根系中缺乏功能性硝酸盐还原酶的转化体中显着改变了N-代谢

The role of nitrate reduction in the anoxic metabolism of roots I. Characterization of root morphology and normoxic metabolism of wild type tobacco and a transformant lacking root nitrate reductase

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