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JOURNAL OF PLANKTON RESEARCH | VOLUME 16 | NUMBER 4 | PAGES 303-316 | 1994
© Oxford University Press

research-article

Effects of nitrogen and phosphorus starvation on nucleic acid and protein content of Heterocapsa sp.

Elisa Berdalet, Mikel Latasa1 and Marta Estrada

Institut de Ciencies del Mar CSIC, P.Joan de Borbó, Comte de Barcelona sin, Barcelona 08039, Spain

Received on March 19, 1993; accepted on October 29, 1993

Changes in the protein, RNA and DNA content related to nitrogen (N) and phosphorus (P) starvation were studied in the marine dinoflagellate Heterocapsa sp. grown in batch cultures. In both cases of nutrient starvation, metabolic adaptations affected protein and RNA pools, while the DNA content per cell remained approximately constant. N starvation led to a parallel decrease in protein and RNA concentration which caused the protein/RNA ratios to remain constant. A dramatic decrease in the RNA content characterized the P-starved cultures, although protein synthesis continued. The ribosomal RNA content was lower than expected given the continuation of protein synthesis. It is suggested that protein/RNA ratios could be used as an indicator of P starvation, while protein/chlorophyll ratios would characterize N starvation

1Present address: University of Hawaii at Manoa Soest, Biological Oceanography, 1000 Pope Road, Honolulu, HI 96822, USA


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