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Appl Environ Microbiol. 1969 January; 17(1): 139-144
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Oxygen-tolerant Strain of Chlorella sorokiniana

Fred W. Wagner1 and B. E. Welch

a Environmental Systems Branch, USAF School of Aerospace Medicine, Aerospace Medical Division (AFSC), Brooks Air Force Base, Texas 78235

ABSTRACT

An oxygen-tolerant strain (OTS) of Chlorella sorokiniana was isolated by growing and continuously subculturing the oxygen-sensitive strain (OSS) in growth medium bubbled continuously with 95% O2-5% CO2. Under these conditions, 6 to 8 hr were required before the OSS began to grow. The growth rates of the OTS and the OSS were the same when grown in an atmosphere of air-5% CO2, and the growth rate of the OTS was the same when aerated with 95% O2-5% CO2 and air-5% CO2. The adaptive process was irreversible since serial transfers of the OTS grown with air-5% CO2 did not alter the ability of the OTS to grow with 95% O2-5% CO2. Inasmuch as photosynthesis in the OTS and the OSS was inhibited to a similar extent by oxygen and the adaptive process occurred heterotrophically in the absence of photosynthesis, it was concluded that the adaptive process was independent of photosynthesis. Morphological differences between the OTS and the OSS are presented and discussed with respect to the adaptive process.

FOOTNOTES

1 USAF Postdoctoral Research Associate. Present Address: Department of Biochemistry and Nutrition, University of Nebraska, Lincoln, Neb. 68503.

Appl Environ Microbiol. 1969 January; 17(1): 139-144
Copyright © 1969 American Society for Microbiology. All Rights Reserved.





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