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Titolo:
Cu, Zn, and Cd acquisition by two spinach cultivars depending on P nutrition and root exudation
Autore:
Keller, H; Romer, W;
Indirizzi:
Univ Gottingen, Inst Agr Chem, D-37075 Gottingen, Germany Univ Gottingen Gottingen Germany D-37075 hem, D-37075 Gottingen, Germany
Titolo Testata:
JOURNAL OF PLANT NUTRITION AND SOIL SCIENCE-ZEITSCHRIFT FUR PFLANZENERNAHRUNG UND BODENKUNDE
fascicolo: 3, volume: 164, anno: 2001,
pagine: 335 - 342
SICI:
1436-8730(200106)164:3<335:CZACAB>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
CADMIUM; SOIL; AGENTS; METALS;
Keywords:
spinach cultivars; heavy metal acquisition; net uptake rate of Cu, Zn, Cd; root length-shoot weight ratio; exudation of organic acids;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Romer, W Univ Gottingen, Inst Agr Chem, Von Siebold Str 6, D-37075 Gottingen, Germany Univ Gottingen Von Siebold Str 6 Gottingen Germany D-37075 rmany
Citazione:
H. Keller e W. Romer, "Cu, Zn, and Cd acquisition by two spinach cultivars depending on P nutrition and root exudation", J PLANT NU, 164(3), 2001, pp. 335-342

Abstract

Within a spectrum of 11 spinach cultivars (cvs) differences in the Cu. Zn,and Cd contents of shoots had been noticed. The aim of this study was therefore to analyze in more detail the acquisition of Cu, Zn, and Cd by the most differing cultivars (Tabu and Monnopa) in dependence on P nutrition. Theplants were grown in a low phosphorus Luvisol (pH 6.3: total contents Cu: 89, Zn: 297, Cd: 1.4 mg kg(-1)) with two phosphorus levels in pots under natural conditions. For the determination of inflow, root length/ shoot weight ratio and of the Cu, Zn, and Cd concentration in the soil solution (rhizosphere) plants were harvested 26 and 40 days after sowing. Root exudation of organic acids of the two cvs was measured 35 days after growing in quartzsand with different P supply. Both cultivars responded to P fertilizer by doubling their shoot weight. With increased P supply (0.68-0.77% P in shoot-DM) both cultivars showed similar heavy metal contents in the shoot resulting from similar root length/shoot weight ratios (RSR) and net uptake rates of the three elements as wellas the same element concentrations in the rhizosphere soil solution. UnderP deficiency, however, cv. Tabu (0.52% P in shoot-DM) showed in comparisonwith cv. Monnopa (0.48% P) higher Cu, Zn, and Cd contents of shoots although its RSR was smaller than that of cv. Monnopa. However, the inflow for Cuwas higher and for Zn and Cd significantly higher compared with cv. Monnopa. This result of cv. Tabu corresponded with higher concentrations of Cu, Zn, and Cd of its rhizosphere soil solution, and its higher exudation rates of oxalate, citrate, and malate (3.9; 1.0; 0.7 nmol cm(-1) h(-1)). The corresponding values for cv. Monnopa were: 1.7: 0.3; 0.4 nmol cm-l h-l. The mobilization of Cu, Zn, and Cd by the excreted organic acids seems to be responsible for the higher Cu, Zn, and Cd inflow of cv. Tabu.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/08/20 alle ore 08:18:53