Respiratory responses of arbuscular mycorrhizal roots to short-term alleviation of P deficiency
Arbuscular mycorrhizal (AM) root respiration can impose a respiratory sink on host reserves under low P conditions, but it is not known how AM roots respond to short-term supply of sufficient P. Therefore, the effect of P stress alleviation on the respiration of AM roots was investigated in 5-week-o...
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| Veröffentlicht in: | Mycorrhiza 2007-03, Vol.17 (2), p.137-143 |
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| description | Arbuscular mycorrhizal (AM) root respiration can impose a respiratory sink on host reserves under low P conditions, but it is not known how AM roots respond to short-term supply of sufficient P. Therefore, the effect of P stress alleviation on the respiration of AM roots was investigated in 5-week-old tomato plants. Plants were inoculated with Glomus mosseae in sand culture and grown hydroponically in a low P (2 μM) nutrient medium for 3 weeks. P stress was alleviated by the supply of 2 mM P for 72 h. With P stress alleviation, the improved root P status coincided with a decline in AM fungal activity and a reduction in root CO₂ and O₂ fluxes of the AM plants. During P stress alleviation, the AM roots had lower concentrations of organic acids, derived from root-zone CO₂ assimilation, in their root exudates. These results show that short-term alleviation of low P conditions in AM roots rapidly affects AM fungal symbiont activity, AM root respiration, and root-zone CO₂-derived organic acid metabolism. |
| doi_str_mv | 10.1007/s00572-006-0093-2 |
| format | Article |
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J ; Kleinert, A</creator><creatorcontrib>Valentine, A. J ; Kleinert, A</creatorcontrib><description>Arbuscular mycorrhizal (AM) root respiration can impose a respiratory sink on host reserves under low P conditions, but it is not known how AM roots respond to short-term supply of sufficient P. Therefore, the effect of P stress alleviation on the respiration of AM roots was investigated in 5-week-old tomato plants. Plants were inoculated with Glomus mosseae in sand culture and grown hydroponically in a low P (2 μM) nutrient medium for 3 weeks. P stress was alleviated by the supply of 2 mM P for 72 h. With P stress alleviation, the improved root P status coincided with a decline in AM fungal activity and a reduction in root CO₂ and O₂ fluxes of the AM plants. During P stress alleviation, the AM roots had lower concentrations of organic acids, derived from root-zone CO₂ assimilation, in their root exudates. These results show that short-term alleviation of low P conditions in AM roots rapidly affects AM fungal symbiont activity, AM root respiration, and root-zone CO₂-derived organic acid metabolism.</description><identifier>ISSN: 0940-6360</identifier><identifier>EISSN: 1432-1890</identifier><identifier>DOI: 10.1007/s00572-006-0093-2</identifier><identifier>PMID: 17216500</identifier><language>eng</language><publisher>Berlin: Berlin/Heidelberg : Springer-Verlag</publisher><subject>Biological and medical sciences ; Carbon Dioxide - metabolism ; Carbon Radioisotopes ; Fundamental and applied biological sciences. 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J</creatorcontrib><creatorcontrib>Kleinert, A</creatorcontrib><title>Respiratory responses of arbuscular mycorrhizal roots to short-term alleviation of P deficiency</title><title>Mycorrhiza</title><addtitle>Mycorrhiza</addtitle><description>Arbuscular mycorrhizal (AM) root respiration can impose a respiratory sink on host reserves under low P conditions, but it is not known how AM roots respond to short-term supply of sufficient P. Therefore, the effect of P stress alleviation on the respiration of AM roots was investigated in 5-week-old tomato plants. Plants were inoculated with Glomus mosseae in sand culture and grown hydroponically in a low P (2 μM) nutrient medium for 3 weeks. P stress was alleviated by the supply of 2 mM P for 72 h. With P stress alleviation, the improved root P status coincided with a decline in AM fungal activity and a reduction in root CO₂ and O₂ fluxes of the AM plants. During P stress alleviation, the AM roots had lower concentrations of organic acids, derived from root-zone CO₂ assimilation, in their root exudates. These results show that short-term alleviation of low P conditions in AM roots rapidly affects AM fungal symbiont activity, AM root respiration, and root-zone CO₂-derived organic acid metabolism.</description><subject>Biological and medical sciences</subject><subject>Carbon Dioxide - metabolism</subject><subject>Carbon Radioisotopes</subject><subject>Fundamental and applied biological sciences. Psychology</subject><subject>Fungi</subject><subject>Glomus mosseae</subject><subject>Hydroponics</subject><subject>Lycopersicon esculentum</subject><subject>Lycopersicon esculentum - microbiology</subject><subject>Microbiology</subject><subject>Mycorrhizae - growth & development</subject><subject>Mycorrhizae - metabolism</subject><subject>Mycorrhizae - physiology</subject><subject>Organic acids</subject><subject>organic acids and salts</subject><subject>P stress</subject><subject>Parasitism and symbiosis</subject><subject>Phosphorus - metabolism</subject><subject>Plant physiology and development</subject><subject>Plant Roots - metabolism</subject><subject>Plant Roots - microbiology</subject><subject>Respiration</subject><subject>Roots</subject><subject>Symbiosis</subject><subject>Tomatoes</subject><subject>vesicular arbuscular mycorrhizae</subject><issn>0940-6360</issn><issn>1432-1890</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2007</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNqF0U1r3DAQBmBRGppN2h_QS2sK6c3tjGRL8jGEfkEgoW3OYixLjYJtbSW7sPn11bILgV56ENLheUcML2OvET4ggPqYAVrFawBZTidq_oxtsBG8Rt3Bc7aBroFaCgmn7CznBwBUUuALdoqKo2wBNsx8d3kbEi0x7apU3nHOLlfRV5T6Ndt1pFRNOxtTug-PNFYpxiVXS6zyfUxLvbg0VTSO7k-gJcR5n7ytBueDDW62u5fsxNOY3avjfc7uPn_6efW1vr758u3q8rq2DeJSt862jeuk8JZzskPT6db2pLUcqBecBqk7h33XchJKiZ44R-Wdb8h6DxLEOXt_mLtN8ffq8mKmkK0bR5pdXLNRwIVEof8LsVMNR60KfPcPfIhrmssSRiLXEhqFBeEB2RRzTs6bbQoTpZ1BMPuOzKEjUzoy-44ML5k3x8FrP7nhKXEspYCLI6BsafSJZhvyk9MSVdvuV3l7cJ6ioV-pmLsfHFCUf1tUQoq_Qs6jmw</recordid><startdate>20070301</startdate><enddate>20070301</enddate><creator>Valentine, A. 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Psychology</topic><topic>Fungi</topic><topic>Glomus mosseae</topic><topic>Hydroponics</topic><topic>Lycopersicon esculentum</topic><topic>Lycopersicon esculentum - microbiology</topic><topic>Microbiology</topic><topic>Mycorrhizae - growth & development</topic><topic>Mycorrhizae - metabolism</topic><topic>Mycorrhizae - physiology</topic><topic>Organic acids</topic><topic>organic acids and salts</topic><topic>P stress</topic><topic>Parasitism and symbiosis</topic><topic>Phosphorus - metabolism</topic><topic>Plant physiology and development</topic><topic>Plant Roots - metabolism</topic><topic>Plant Roots - microbiology</topic><topic>Respiration</topic><topic>Roots</topic><topic>Symbiosis</topic><topic>Tomatoes</topic><topic>vesicular arbuscular mycorrhizae</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Valentine, A. 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| subjects | Biological and medical sciences Carbon Dioxide - metabolism Carbon Radioisotopes Fundamental and applied biological sciences. Psychology Fungi Glomus mosseae Hydroponics Lycopersicon esculentum Lycopersicon esculentum - microbiology Microbiology Mycorrhizae - growth & development Mycorrhizae - metabolism Mycorrhizae - physiology Organic acids organic acids and salts P stress Parasitism and symbiosis Phosphorus - metabolism Plant physiology and development Plant Roots - metabolism Plant Roots - microbiology Respiration Roots Symbiosis Tomatoes vesicular arbuscular mycorrhizae |
| title | Respiratory responses of arbuscular mycorrhizal roots to short-term alleviation of P deficiency |
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