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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Phosphorus limitation for the colony formation, growth and photosynthesis of an edible cyanobacterium, Nostoc sphaeroides.
Biotechnology Letters 2012 January
The percentage of spherical colonies from the trichomes of Nostoc sphaeroides reached 62-73% after 16 days with 50 and 250 μM P, but only 10-15% at 0.5 and 5 μM P. During colony formation from microcolonies to macrocolonies, the growth rates were 95, 206 and 244% higher, respectively at 5, 50 and 250 μM P than that at 0.5 μM P. The light-saturated photosynthetic rate, maximum electron transport rate and light-limited photosynthetic efficiency at 0.5 μM P decreased, respectively, by 45, 51 and 32% than those at 250 μM P. These indicated that the colony development, growth and photosynthetic capacities were restricted at low P level, suggesting that P might be an important factor limiting the productivity and distribution of N. sphaeroides in the field.
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