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| Web URL(s): | http://www.plantphysiol.org/cgi/content/full/128/2/742?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Dynamic+and+steady-state+responses+of+inorganic+nitrogen+pools+and+NH3+exchange+in+leaves+of+Lolium+&searched=1&FIRSTINDEX=0&volume=128&issue=2&resourcetype=HWCIT
Last checked: 10/2000
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Mattsson, Marie;
Schjoerring, Jan K. |
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| Author Affiliation: | Plant Nutrition Laboratory, Department of Agricultural Sciences, Royal Veterinary and Agricultural University, Copenhagen, Denmark |
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| Title: | Dynamic and steady-state responses of inorganic nitrogen pools and NH3 exchange in leaves of Lolium perenne and Bromus erectus to changes in root nitrogen supply |
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| Source: | Plant Physiology. Vol. 128, No. 2, February 2002, p. 742-750. |
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| Publishing Information: | Rockville, MD: American Society of Plant Physiologists |
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| # of Pages: | 9 |
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| Keywords: | TIC Keywords: Inorganic fertilizers; Nitrogen; Ammonia; Leaves; Lolium perenne; Bromus erectus; Roots; Nitrogen metabolism; Nitrogen cycle; Nitrogen retention; Nitrogen uptake; pH; Nitrates
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| Abstract/Contents: | "Short- and long-term responses of inorganic N pools and plant-atmosphere NH3 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 NO3- to NH4+ caused within 3 h a 3- to 6-fold increase in leaf apoplastic NH4+ concentration and a simultaneous decrease in apoplastic pH of about 0.4 pH units in both species. The concentration of total extractable leaf tissue NH4+ also increased two to three times within 3 h after the switch. Removal of exogenous NH4+ caused the apoplastic NH4+ concentration to decline back to the original level within 24 h, whereas the leaf tissue NH4+ 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 NO3- or NH4+, 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 NO3-, NH4+, and total N. Ammonia compensation points were higher for B. erectus than for L. perenne and were in both species higher for NH4+- than for NO3- -grown plants. Steady-state levels of apoplastic NH4+, tissue NH4+, and NH3 emission were significantly correlated. It is concluded that leaf apoplastic NH4+ 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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| Language: | English |
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| References: | 33 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Mattsson, M., and J. K. Schjoerring. 2002. Dynamic and steady-state responses of inorganic nitrogen pools and NH3 exchange in leaves of Lolium perenne and Bromus erectus to changes in root nitrogen supply. Plant Physiol. 128(2):p. 742-750. |
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| Web URL(s):
http://www.plantphysiol.org/cgi/content/full/128/2/742?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=Dynamic+and+steady-state+responses+of+inorganic+nitrogen+pools+and+NH3+exchange+in+leaves+of+Lolium+&searched=1&FIRSTINDEX=0&volume=128&issue=2&resourcetype=HWCIT
Last checked: 10/2000
Access conditions: Item is within a limited-access website |
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MSU catalog number: QK 1 .P68 |
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