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Rhizospheric NO affects N uptake and metabolism in Scots pine (Pinus sylvestris L.) seedlings depending on soil N availability and N source.
MedLine Citation:
PMID:  23146102     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We investigated the interaction of rhizospheric nitric oxide (NO) concentration (i.e., low, ambient, or high) and soil N availability (i.e., low or high) with organic and inorganic N uptake by fine roots of Pinus sylvestris L. seedlings by (15) N feeding experiments under controlled conditions. N metabolites in fine roots were analysed to link N uptake to N nutrition. NO affected N uptake depending on N source and soil N availability. The suppression of nitrate uptake in the presence of ammonium and glutamine was overruled by high NO. The effects of NO on N uptake with increasing N availability showed different patterns: (1) increasing N uptake regardless of NO concentration (i.e., ammonium), (2) increasing N uptake only with high NO concentration (i.e., nitrate and arginine), and (3) decreasing N uptake (i.e., glutamine). At low N availability and high NO nitrate accumulated in the roots indicating insufficient substrates for nitrate reduction or its storage in root vacuoles. Individual amino acid concentrations were negatively affected with increasing NO (i.e., asparagine and glutamine with low, serine and proline with high N availability). In conclusion, this study provides first evidence that NO affects N uptake and metabolism in a conifer. © 2012 Blackwell Publishing Ltd.
Authors:
Judy Simon; Fang Dong; Franz Buegger; Heinz Rennenberg
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-12
Journal Detail:
Title:  Plant, cell & environment     Volume:  -     ISSN:  1365-3040     ISO Abbreviation:  Plant Cell Environ.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9309004     Medline TA:  Plant Cell Environ     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012 Blackwell Publishing Ltd.
Affiliation:
Institute of Forest Botany and Tree Physiology, Chair of Tree Physiology, University of Freiburg, Georges-Koehler-Allee 53/54, 79110 Freiburg, Germany Institute of Soil Ecology, Helmholtz Zentrum München, Ingolstädter Landstrasse 1, 85764 Neuherberg, Germany.
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