The effects of ammonium on growth, accumulation of free amino acids and nutritional status of young phosphorus deficient Stratiotes aloides plants

Turions of Stratiotes aloides L. were grown at different ammonium levels under phosphorus deficient conditions in a staged gradient. After 13 weeks the plantlets appeared to be severely phosphorus deficient with the growth being seriously impaired. Nitrogen in the plants appeared to be predominantly...

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Bibliographic Details
Published in:Aquatic botany 1996-03, Vol.53 (1), p.85-96
Main Authors: Smolders, A.J.P., den Hartog, C., van Gestel, C.B.L., Roelofs, J.G.M.
Format: Article
Language:English
Subjects:
Amino acid accumulation
Ammonium toxicity
Asparagine
Phosphorus deficiency
Stratiotes aloides
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Summary:Turions of Stratiotes aloides L. were grown at different ammonium levels under phosphorus deficient conditions in a staged gradient. After 13 weeks the plantlets appeared to be severely phosphorus deficient with the growth being seriously impaired. Nitrogen in the plants appeared to be predominantly present as soluble amino acids. This indicates that net protein synthesis was seriously disturbed. Asparagine was by far the dominant soluble amino acid in the plantlets. At the highest external ammonium levels, net growth was significantly retarded when compared with the other concentrations with free ammonium accumulating in the plants. Ammonium uptake under phosphorus deficient conditions strongly increases nutrient imbalances in the plants, and thus their vitality.
ISSN:0304-3770
1879-1522
DOI:10.1016/0304-3770(95)01014-9