| Dynamic and steady-state responses of inorganic nitrogen pools and NH(3) exchange in leaves of Lolium perenne and Bromus erectus to changes in root nitrogen supply. | |
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MedLine Citation:
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PMID: 11842177 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Short- and long-term responses of inorganic N pools and plant-atmosphere NH(3) exchange to changes in external N supply were investigated in 11-week-old plants of two grass species, Lolium perenne and Bromus erectus, characteristic of N-rich and N-poor grassland ecosystems, respectively. A switch of root N source from NO(-)(3)to NH(4)(+) caused within 3 h a 3- to 6-fold increase in leaf apoplastic NH(4)(+) concentration and a simultaneous decrease in apoplastic pH of about 0.4 pH units in both species. The concentration of total extractable leaf tissue NH(4)(+) also increased two to three times within 3 h after the switch. Removal of exogenous NH(4)(+) caused the apoplastic NH(4)(+) concentration to decline back to the original level within 24 h, whereas the leaf tissue NH(4)(+)concentration decreased more slowly and did not reach the original level in 48 h. After growing for 5 weeks with a steady-state supply of NO(-)(3)or NH(4)(+), L. perenne were in all cases larger, contained more N, and utilized the absorbed N more efficiently for growth than B. erectus, whereas the two species behaved oppositely with respect to tissue concentrations of NO(-)(3), NH(4)(+), and total N. Ammonia compensation points were higher for B. erectus than for L. perenne and were in both species higher for NH(4)(+)- than for NO(-)(3)-grown plants. Steady-state levels of apoplastic NH(4)(+), tissue NH(4)(+), and NH(3) emission were significantly correlated. It is concluded that leaf apoplastic NH(4)(+) is a highly dynamic pool, closely reflecting changes in the external N supply. This rapid response may constitute a signaling system coordinating leaf N metabolism with the actual N uptake by the roots and the external N availability. |
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Authors:
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Marie Mattsson; Jan K Schjoerring |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Plant physiology Volume: 128 ISSN: 0032-0889 ISO Abbreviation: Plant Physiol. Publication Date: 2002 Feb |
Date Detail:
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Created Date: 2002-02-13 Completed Date: 2002-06-27 Revised Date: 2010-09-14 |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 742-50 Citation Subset: IM |
Affiliation:
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Plant Nutrition Laboratory, Department of Agricultural Sciences, Royal Veterinary and Agricultural University, Thorvaldensvej 40, DK-1871 Frederiksberg C, Copenhagen, Denmark. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Ammonia
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pharmacology* Cell Wall / drug effects Nitrates / metabolism, pharmacology Nitrogen / pharmacology Nitrogen Compounds / pharmacology* Plant Leaves / drug effects, metabolism Plant Roots / drug effects, metabolism Poaceae / drug effects*, metabolism Quaternary Ammonium Compounds / metabolism, pharmacology Signal Transduction |
| Chemical | |
Reg. No./Substance:
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0/Nitrates; 0/Nitrogen Compounds; 0/Quaternary Ammonium Compounds; 7664-41-7/Ammonia; 7727-37-9/Nitrogen |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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