Resistance of Spirulina platensis to Ammonia at High pH Values
S Belkin, S Boussiba - Plant and cell physiology, 1991 - academic.oup.com
Plant and cell physiology, 1991•academic.oup.com
Spirulina platensis is an alkalophilic cyanobacterium, exhibiting optimal growth at pH 9.0 to
10.0. It grows well at pH 11.5 but not at pH 7.0. Unlike many other photosynthetic
microorganisms, it is capable of utilizing ammonia3 even at high pH values, and is resistant
to the ammonia-mediated uncoupling of photosynthesis. The entry of ammonia into the cells
is ΔpH-dependent, and is limited by a relatively high average internal pH. This high pH
value appears to be maintained predominantly by a high intrathylakoid pH.
10.0. It grows well at pH 11.5 but not at pH 7.0. Unlike many other photosynthetic
microorganisms, it is capable of utilizing ammonia3 even at high pH values, and is resistant
to the ammonia-mediated uncoupling of photosynthesis. The entry of ammonia into the cells
is ΔpH-dependent, and is limited by a relatively high average internal pH. This high pH
value appears to be maintained predominantly by a high intrathylakoid pH.
Abstract
Spirulina platensis is an alkalophilic cyanobacterium, exhibiting optimal growth at pH 9.0 to 10.0. It grows well at pH 11.5 but not at pH 7.0. Unlike many other photosynthetic microorganisms, it is capable of utilizing ammonia3 even at high pH values, and is resistant to the ammonia-mediated uncoupling of photosynthesis. The entry of ammonia into the cells is ΔpH-dependent, and is limited by a relatively high average internal pH. This high pH value appears to be maintained predominantly by a high intrathylakoid pH.
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