ArticlePlant physiology1998
Regulation of apoplastic NH4+ concentration in leaves of oilseed rape
Article in Plant physiology, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.
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Who cites it
21 citing papers in PubMed.
- Nitrogen metabolic rate and differential ammonia volatilization regulate resistance against opportunistic fungusFrontiers in plant science · 2022Article
- Function and Regulation of Ammonium Transporters in Plants.International journal of molecular sciences · 2020Review
- Tolerant mechanisms to OJournal of plant research · 2020Article
- Manipulating Amino Acid Metabolism to Improve Crop Nitrogen Use Efficiency for a Sustainable Agriculture.Frontiers in plant science · 2020Review
- Urea retranslocation from senescing Arabidopsis leaves is promoted by DUR3-mediated urea retrieval from leaf apoplast.The Plant journal : for cell and molecular biology · 2015Article
- Elevated atmospheric CO2 decreases the ammonia compensation point of barley plants.Journal of experimental botany · 2013Article
- Microscopy and proteomic analysis of the non-host resistance of Oryza sativa to the wheat leaf rust fungus, Puccinia triticina f. sp. tritici.Plant cell reports · 2012Article
- Competition between uptake of ammonium and potassium in barley and Arabidopsis roots: molecular mechanisms and physiological consequences.Journal of experimental botany · 2010Article
- Identification of an apoplastic protein involved in the initial phase of salt stress response in rice root by two-dimensional electrophoresis.Plant physiology · 2009Article
- NH4+-stimulated and -inhibited components of K+ transport in rice (Oryza sativa L.).Journal of experimental botany · 2008Article
- Article
- The organization of high-affinity ammonium uptake in Arabidopsis roots depends on the spatial arrangement and biochemical properties of AMT1-type transporters.The Plant cell · 2007Article
- Tonoplast intrinsic proteins AtTIP2;1 and AtTIP2;3 facilitate NH3 transport into the vacuole.Plant physiology · 2005Article
- Characterization of three functional high-affinity ammonium transporters in Lotus japonicus with differential transcriptional regulation and spatial expression.Plant physiology · 2004Article
- Photorespiratory NH(4)(+) production in leaves of wild-type and glutamine synthetase 2 antisense oilseed rape.Plant physiology · 2002Article
- Subcellular NHThe New phytologist · 2002Article
- Regulation of the high-affinity ammonium transporter (BnAMT1;2) in the leaves of Brassica napus by nitrogen status.Plant molecular biology · 2002Article
- Leaf urea metabolism in potato. Urease activity profile and patterns of recovery and distribution of (15)N after foliar urea application in wild-type and urease-antisense transgenics.Plant physiology · 2002Article
- Futile transmembrane NH4(+) cycling: a cellular hypothesis to explain ammonium toxicity in plants.Proceedings of the National Academy of Sciences of the United States of America · 2001Article
- Comparison of gas exchange and bioassay determinations of the ammonia compensation point in Luzula sylvatica (Huds.) Gaud.Plant physiology · 2001Article
Corrections and comments
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Authors and funding
2 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Regulation of apoplastic NH4+ concentration in leaves of oilseed rape (Brassica napus L.) was studied using a vacuum-infiltration technique that allowed controlled manipulations of the apoplastic solution. In leaves infiltrated with NH4+-free solution, the apoplastic NH4+ concentration returned in less than 1.5 min to the preinfiltration level of 0.8 mM. Infiltrated 15NH4+ was rapidly diluted by 14NH4+/14NH3 effluxed from the cell. The exchange rate of 15N/14N over the apoplast due to combined 14N efflux from the symplast and 15N influx from the apoplastic solution was 29.4 &mgr;mol g-1 fresh weight h-1 between 0 and 5 min after infiltration. The net uptake of NH4+ into the leaf cells increased linearly with apoplastic NH4+ concentrations between 2 and 10 mM and could be partially inhibited by the channel inhibitors La3+ and tetraethylammonium and by Na+ and K+. When apoplastic pH increased from 5.0 to 8.0, the steady-state apoplastic NH4+ concentration decreased from 1.0 to 0.3 mM. Increasing temperature increased the rate of NH4+ net uptake and reduced the apoplastic steady-state NH4+ concentration. We conclude that the apoplastic solution in leaves of oilseed rape constitutes a highly dynamic NH4+ pool.
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Registered trials
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