Nitrogen nutrition in the estuarine zone: the case of Suaeda maritima var. macrocarpa View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1985-06

AUTHORS

J. Boucaud, J. P. Billard

ABSTRACT

Suaeda maritima L. var. macrocarpa is a halophytic species distributed in the lower parts of salt marshes of the French coasts. The influence of salinity on nitrogen nutrition and on levels of the key enzymes involved in nitrogen assimilation is analyzed by growing Suaeda under experimental conditions. Use of 15N-labelled NO3- and NH4+ shows that both ions are effective sources of inorganic nitrogen for Suaeda. The plant is found to use NH4+ ions with a good yield, chiefly at high salinities (up to 130 mM). Nitrate reduction and ammonium assimilation by the glutamine synthetase/glutamate synthase pathway occurs mainly in leaves when Suaeda is grown at optimal saline conditions (130 mM NaCl). Absence of NaCl creates less favourable conditions and lowers the activity of nitrate reductase and glutamine synthetase but leads to an important activity of glutamate dehydrogenase in roots. This enzyme could play a major role under suboptimal environmental conditions (i.e., absence of NaCl for Suaeda maritima). More... »

PAGES

303-308

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00044757

DOI

http://dx.doi.org/10.1007/bf00044757

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1011106502


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