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RECORD NUMBER: 9 OF 14

OLS Field Name OLS Field Data
Main Title Nutritional Requirements of the Submerged Angio-Sperm 'Ruppia maritima' in Algae-Free Culture.
Author Thursby, G. B. ;
CORP Author Environmental Research Lab., Narragansett, RI. ;Rhode Island Univ., Kingston. Dept. of Botany.
Year Published 1984
Report Number EPA-600/J-84-047 ;CONTRIB-580;
Stock Number PB84-222660
Additional Subjects Aquatic plants ; Plant nutrition ; Growth ; Brackish water ; Vitamins ; Metals ; Iron ; Inorganic phosphates ; Concentration(Composition) ; Inorganic nitrates ; Tissues(Biology) ; Requirements ; Reprints ; Ruppia maritima ; Vascular plants
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB84-222660 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 8p
Abstract
Ruppia maritima has the potential to become a model laboratory organism for studies with submerged aquatic vascular plants. The present study demonstrated that algae-free R. maritima grew well in a defined medium without sediment. Growth was a linear response to photon flux density over the range of light tested. Vitamins may be a necessary addition in artificial seawater. Trace metals caused little or no increase in growth during short-term (3 wk) growth studies, but appear to be required for long-term cultivation. Iron also caused no increase in growth, at the concentrations tested, but plants were greener in 1.46 micrometers M iron. A nitrate concentration of 110 micrometers M and a phosphate concentration of 2.3 micrometers M were sufficient for maximum growth. However, 4.5 micrometers M phosphate eliminated occasional CaCO3 precipitation in stock cultures. Critical tissue nitrogen content was between 2.5 and 3.0%, and critical phosphorus content between 0.25 and 0.35%. A comparison with field data suggests that R. maritima was deficient in both nitrogen and phosphorus during much of the summer.