O heterotrofnoj ishrani nekih vrsta zelenih alga

The growth of eight species of green algae on sixteen organic substrates in the light as well as in the dark was tested quantitatively. The growth was stimulated by most organic substrates and we can correlate it with heterotrophic nutrition. The heterotrophic growth was stimulated in the light. The best ability of heterotrophic growth has been shown in two species: Scenedesmus quadricauda and Chlorella sp., and the poorest in Ulothrix sp. Glucose, fructose, peptone and yeast extract were the most efficient growth substrates and the least efficient were ribose and urea. Enlarged and giant cells of unicellular species were usually present during their heterotrophic growth. These changes are considered to be the consequence of the disharmony between the process of cell growth and cell division.Kvantitativno je ispitivano rastenje osam vrsta zelenih alga na šesnaest organskih supstrata, kako na svjetlosti tako i u tami. Mnogi organski supstrati stimulirali su rast, pa to možemo povezati sa heterotrofnom prehranom. Svjetlost je stimulirala heterotrofni rast. Najpogodniji supstrati za heterotrofiju bili su: glukoza, fruktoza, pepton i ekstrakt kvasca, a inhibiciju rastenja kod većine vrsta izazvali su riboza i urea. Najbolji heterotrofni rast pokazale su vrste Scenedesmus quadricarida i Chlorella sp., a najslabiji nitasta alga Ulothrix sp. Kod jednostaničnih vrsta bile su često prisutne povećane i divovske stanice. Te promjene protumačene su kao poremećaj ravnoteže između procesa rastenja i dijeljenja stanica