Is the Heterocyst the Site of Nitrogen Fixation in Blue-green Algae?

Nature ◽  
1968 ◽  
Vol 220 (5169) ◽  
pp. 810-812 ◽  
Author(s):  
P. FAY ◽  
W. D. P. STEWART ◽  
A. E. WALSBY ◽  
G. E. FOGG
Keyword(s):  
Nitrogen Fixation ◽  
Green Algae ◽  
Blue Green Algae

scholarly journals Studies on Nitrogen Fixation by Blue-Green Algae

1942 ◽  
Vol 19 (1) ◽  
pp. 78-87
Author(s):  
G. E. FOGG
Keyword(s):  
Nitrogen Fixation ◽  
Green Algae ◽  
Anabaena Cylindrica ◽  
Fixed Nitrogen ◽  
Blue Green Algae ◽  
Combined Nitrogen

1. Anabaena cylindrica Lemin. has been obtained in pure unialgal bacteria-free culture. 2. Due precautions having been taken against contamination by other organisms and error due to absorption of fixed nitrogen from the atmosphere, this alga has been shown to possess the capacity of fixing nitrogen. 3. Nitrogen fixation does not take place in the presence of a sufficient quantity of readily available combined nitrogen.

Blue-green algae in southern Australian rangeland soils.

1989 ◽  
Vol 11 (2) ◽  
pp. 67 ◽  
Author(s):  
RW Rogers
Keyword(s):  
Nitrogen Fixation ◽  
Climatic Change ◽  
Green Algae ◽  
Soil Conservation ◽  
Soil Surface ◽  
Soil Samples ◽  
Blue Green Algae ◽  
Range Condition ◽  
The Subject ◽  
Arid Rangelands

Blue-green algae (Cyanobacteria) are imponant to the ecology of arid rangelands as sources of nitrogen and as soil stabilizers, yet have been the subject of little comment or investigation in Australia. To provide information on their distribution soil samples were collected from 136 locations in rangeland areas of southem Australia and cultured to permit the identification of the blue-green algae present. Blue-green algae were found in 134 of the samples. The species represented include several apparently capable of nitrogen fixation, and all produce a gelatinous sheath which can bind soil panicles to produce soil-surface crusts. It is likely that lichens and blue-green algae are important for the ecology of arid rangelands now, and if climatic change destroys the lichens which are very heat sensitive when wet, blue- greens may become even more significant in soil conservation and the maintenance of pasture productivity. Both lichens and blue-green algae merit inclusion in assessments of range condition.

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