A comparative study of sodium andosmotic requirements for growth and nutrient uptake of two related green flagellates,Dunaliella tertiolectaandChlamydomonas pulsatilla
✍ Scribed by Johan A. Hellebust
- Publisher
- Springer
- Year
- 1985
- Tongue
- English
- Weight
- 453 KB
- Volume
- 143
- Category
- Article
- ISSN
- 0302-8933
No coin nor oath required. For personal study only.
✦ Synopsis
Dunaliella tertiolecta, a euryhaline marine flagellate, grows over a wide salinity range and exhibits both a minimum sodium and osmotic requirement for growth.
Chlamydomonas pulsatilla, a flagellate isolated from a supralittoral rockpool, grows over a more narrow salinity range, and exhibits no sodium or minimum osmotic requirement for growth. The uptake ofmethylamine by C. pulsatilla is not markedly influenced by the presence of sodium. Phosphate uptake by this flagellate, while showing no absolute dependence on the presence of sodium, is strongly stimulated by low sodium concentrations. Dunaliella tertiolecta, on the other hand, shows absolute requirements for sodium for both methylamine and phosphate uptake. The concentrations of sodium needed for nutrient uptake agree well with those needed for growth when the osmotic requirement for growth of this flagellate is satisfied by mannitol.