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Titolo:
RESISTANCE TO DIVALENT MANGANESE OF SALT-MARSH PLANTS
Autore:
SINGER CE; HAVILL DC;
Indirizzi:
UNIV LONDON BIRKBECK COLL,DEPT BIOL,MALET ST LONDON WC1E 7HX ENGLAND UNIV LONDON BIRKBECK COLL,DEPT BIOL,MALET ST LONDON WC1E 7HX ENGLAND
Titolo Testata:
Journal of Ecology
fascicolo: 4, volume: 81, anno: 1993,
pagine: 797 - 806
SICI:
0022-0477(1993)81:4<797:RTDMOS>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
DUNE SLACK PLANTS; GROWTH; TOLERANCE; SALINITY; SULFIDE; IRON;
Keywords:
HALOPHYTES; MANGANESE AVAILABILITY; MANGANESE TOXICITY; ROOT ELONGATION; WATERLOGGED SOILS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
C.E. Singer e D.C. Havill, "RESISTANCE TO DIVALENT MANGANESE OF SALT-MARSH PLANTS", Journal of Ecology, 81(4), 1993, pp. 797-806

Abstract

1 Analysis of sediments taken from the emergence and submergence saltmarsh showed that plant-available manganese may occur at a relativelyhigh concentration in all marsh zones. Although there was considerable variation in manganese availability this did not correlate with the height of the marsh surface nor the distribution of marsh species. 2 The manganese concentration found in plant tissues collected from fieldsites was consistent with a similar availability of manganese in the upper and lower marsh. 3 In plant growth experiments interspecific differences in manganese resistance were found to be independent of zonation. 4 In both the emergence and submergence marsh, available manganese was highest in the surface 1 cm, declining markedly at a depth of 1-2 cm. This surface accumulation did not correspond to increased organic enrichment. 5 The available manganese of salt-marsh sediments was much higher than in samples of calcareous soil taken from under Festuca ovina. The mean and range of available manganese in acidic soil collected from under Deschampsia flexuosa was similar to the top centimetre of salt-marsh sediments. 6 Plant culture experiments indicate that salt-marsh species have an enhanced tolerance of manganese. Consistent with this, an inland ecotype of Armeria maritima was found to be significantly more sensitive to high manganese availability than a marsh population. However, resistance to manganese toxicity was less than expected on the basis of the observed manganese concentration in sediments. 7 In culture solutions containing 1% NaCl manganese toxicity was greatly reduced, probably as a result of reduced uptake. It is suggested that Na+-Mn++ antagonism alleviates the potential toxicity of manganese in salt marshes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 06:33:49