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Titolo:
Release of carbon and nitrogen compounds by plant roots and their possibleecological importance
Autore:
Merbach, W; Mirus, E; Knof, G; Remus, R; Ruppel, S; Russow, R; Gransee, A; Schulze, J;
Indirizzi:
Univ Halle Wittenberg, Inst Pflanzenernahrung & Bodenkunde, D-06108 Halle,Saale, Germany Univ Halle Wittenberg Halle Saale Germany D-06108 08 Halle,Saale, Germany Zentrum Agr Landschafts & Landnutzungsforsch, Inst Rhizospharenforsch & Pflanzenernahrung, D-15374 Muncheberg, Germany Zentrum Agr Landschafts & Landnutzungsforsch Muncheberg Germany D-15374 Inst Gemuse & Zierpflanzenbau, D-14979 Grossbeeren, Germany Inst Gemuse & Zierpflanzenbau Grossbeeren Germany D-14979 eeren, Germany Umweltforschungszentrum Leipzig Halle, Sekt Bodenforsch, D-06120 Halle, Saale, Germany Umweltforschungszentrum Leipzig Halle Halle Saale Germany D-06120 Germany
Titolo Testata:
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE
fascicolo: 4, volume: 162, anno: 1999,
pagine: 373 - 383
SICI:
1436-8730(199908)162:4<373:ROCANC>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
PANTOEA-AGGLOMERANS; RHIZOSPHERE MICROORGANISMS; ORGANIC-SUBSTANCES; WHEAT PLANTS; SOIL; MAIZE; EXUDATION; POTASSIUM; MUCILAGE; WEIGHT;
Keywords:
rhizosphere; rhizodeposition; root exudates; carbon and nitrogen balances; plant-microbe interactions;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Merbach, W Univ Halle Wittenberg, Inst Pflanzenernahrung & Bodenkunde, Adam Kuckhoff Str 17B, D-06108 Halle, Saale, Germany Univ Halle Wittenberg Adam Kuckhoff Str 17B Halle Saale Germany D-06108
Citazione:
W. Merbach et al., "Release of carbon and nitrogen compounds by plant roots and their possibleecological importance", J PLANT NU, 162(4), 1999, pp. 373-383

Abstract

The root-borne C- and N-flux in the plant/soil system was studied by determining the C-14- or N-15-balances in pot trials with soil as a substrate ((CO2)-C-14- or (NH3)-N-15-application to the shoots, comparison of sterile and nonsterile treatments for quantification of root-borne substances). The following results were obtained:1. The amount of (primary) root-borne carbon compounds released into soil was (besides root respiration) 11-20% of net-CO2-assimilation or 13-32% of the C-14 incorporated into the plants (= 1 t C . ha(-1)). 5-6% of N-15 assimilated by the plants were released as root-borne N compounds (= 15 kg N . ha(-1)).2. A considerable portion of the root-borne C (about 6% = 600 kg C . ha(-1)) was found in the rooted soil zone at the end of the experiments (rhizodeposition).3. (Primary) root-borne C and N compounds found in immediate vicinity of the roots (about 60-80%) were mainly water soluble, whereas most of the C and N compounds found in a greater distance were water insoluble. The water soluble exudates consisted mainly of neutral (carbohydrates) and acid fractions (organic acids). The basic fraction (amino acids) made up a small portion only.4. The root-borne C and N compounds influenced the nutrient balance of soil and plant directly and/or indirectly via microbes (depending on species, variety and nutritional status of plants).5. Microbes stimulated the release of C- and N-compounds, but rapidly respired 65-85% of the root-borne C-compounds, thereby putting a burden on the C-budget of the "host" plant.6. It could be shown by the example of hup(+) Rhizobium meliloti strains (tested by H-3(2)-incorporation) and the wheat-Serratia-association, that energy efficient microbenplant systems can improve plant performance.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 20:22:11