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Titolo:
Transformation of organic rhizodepositions by rhizosphere bacteria and itsinfluence on the availability of tertiary calcium phosphate
Autore:
Deubel, A; Gransee, A; Merbach, W;
Indirizzi:
Univ Halle Wittenberg, Inst Plant Nutr & Soil Sci, D-06108 Halle, Germany Univ Halle Wittenberg Halle Germany D-06108 Sci, D-06108 Halle, Germany
Titolo Testata:
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE
fascicolo: 4, volume: 163, anno: 2000,
pagine: 387 - 392
SICI:
1436-8730(200008)163:4<387:TOORBR>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ROOTS; SOIL; CARBON; PLANTS; ACIDS; MAIZE; SOLUBILIZATION; MECHANISMS; EXUDATION; AMMONIUM;
Keywords:
rhizosphere bacteria; phosphate mobilization; rhizodeposition; microbial transformation of root exudates;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Deubel, A Univ Halle Wittenberg, Inst Plant Nutr & Soil Sci, Adam KuckhoffStr 17B, D-06108 Halle, Germany Univ Halle Wittenberg Adam Kuckhoff Str 17B Halle Germany D-06108
Citazione:
A. Deubel et al., "Transformation of organic rhizodepositions by rhizosphere bacteria and itsinfluence on the availability of tertiary calcium phosphate", J PLANT NU, 163(4), 2000, pp. 387-392

Abstract

This study assesses the influence of saccharides in the rhizodeposition onthe phosphate solubilizing ability of rhizosphere bacteria. Water-soluble rhizodeposits were analyzed of C-14-labeled pea plants (Pisum sativum, cv. 'Grapis') which were grown at two different levels of P-nutrition. The sugars produced were fed in vitro either as single compounds or as synthetic mixtures to three bacterial strains and the ability of the bacteria to mobilize Ca-3(PO4)(2) was measured. The relative glucose proportion of pea exudates decreased under P deficiency while the content of galactose, ribose, xylose and fucose increased. In vitro feeding of single sugars and sugar mixtures showed that the ability of Pseudomonas fluorescens (PsIA12) to dissolve tertiary calcium phosphate was lower with pentoses and the mixed sugars of the P-deficient plants than with glucose. On the other hand, the shifted sugar pattern observed under Pdeficiency increased the phosphate mobilization ability of Pentoses agglomerans (D5/23) and Azospirillum sp. (CC 322) considerably. This observation can only partly be explained by the acidification of the nutrient medium. Bacteria also produced different carboxylic anions depending on sugar supply. In addition to low-molecular mono-, di-, and tricarboxylic acids which are known as P-solubilizing substances, sugar acids also played an important role in cultures D 5/23 and CC 322.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:37:03