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Effect of oxygen on photoautotrophic and heterotrophic growth of Chlamydomonas reinhardtii in an anoxic atmosphere.

Abstract：

:Photoautotrophic growth of Chlamydomonas reinhardtii was shown to be independent of the presence of atmospheric oxygen. Under constant light and photoautotrophic conditions, C. reinhardtii grew equally well in either air or 367 PPM CO2-in-He. During 12-h light-dark cycles, the cells in air grew substantially faster than those grown in CO2-in-He, indicating a significant role for O2 in dark metabolism. Although cells grown under CO2-in-He were not supplied any exogenous O2, photosynthetic water splitting resulted in the liberation of O2. The effect of photoevolved O2 on the growth of C. reinhardtii was examined (1) by measuring the amount of O2 consumed by photosynthesizing algae, (2) by growing the algae heterotrophically on acetate in the dark and supplied with O2 generated by photoautotrophically grown cells, and (3) by determining the minimum level of O2 needed to stimulate CO2 evolution from cells suspended in minimal medium supplemented with acetate. The results from these investigations indicated that exogenous O2 was not required for photoautotrophic growth by C. reinhardtii and that this alga grew in an anoxic environment if supplied with CO2 and light.

journal_name

Photochem Photobiol

journal_title

Photochemistry and photobiology

authors

Graves DA,Spradlin GM,Greenbaum E

doi

10.1111/j.1751-1097.1990.tb01803.x

subject

Has Abstract

pub_date

1990-09-01 00:00:00

pages

585-90

issue

3

eissn

0031-8655

issn

1751-1097

journal_volume

52

pub_type

杂志文章

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