Detection of denitrification, by a 15N racer technique, of nitrogen released from azolla and blue-green algae in a flooded soil

Soil Research ◽  
1985 ◽  
Vol 23 (2) ◽  
pp. 245 ◽  
Author(s):  
MH Mian
Keyword(s):  
Ammonium Sulfate ◽  
Green Algae ◽  
Total Nitrogen ◽  
Sodium Nitrate ◽  
Nostoc Muscorum ◽  
Flooded Soil ◽  
Flooded Soils ◽  
Mineral N ◽  
Treated Soil ◽  
Blue Green Algae

Denitrification of nitrogen from applied NH4+ and NO3-, and nitrogen released from Azolla caroliniana, Anabaena variabilis and Nostoc muscorum, was studied in a flooded soil. Denitrification did not occur in Azolla-, Anabaena-, Nostoc- or ammonium sulfate-treated soil, incubated at 18� to 25�C, until after 30 days since time was required to develop a surface-oxidized layer where nitrification could first take place. About 32, 45 and 49% of the total nitrogen in Azolla, Anabaena and Nostoc was released as mineral-N in 60 days, with 96, 93 and 93% respectively of this being lost as N2. Thus potentially serious losses of nitrogen from Azolla and blue-green algae may be avoided if their incorporated residues in flooded soils are left no longer than 3 weeks before planting a rice crop. Denitrification started within 3 days of incubation in the sodium nitrate-treated soil. About 10 and 75% of the ISN applied as ammonium sulfate and sodium nitrate, respectively, was lost as N, in 60 days. In addition, a substantial amount of 15N+4- N was formed from the applied 15NO-3-N (about 9% of the total amount added) in 60 days, indicating that a dissimilatory pathway also existed in this soil.

Effect of microcrustaceans on blue-green algae in flooded soil

1980 ◽  
Vol 12 (3) ◽  
pp. 237-240 ◽  
Author(s):  
John T. Wilson ◽  
Sarah Greene ◽  
Martin Alexander
Keyword(s):  
Green Algae ◽  
Flooded Soil ◽  
Blue Green Algae

Inhibition of Photosystem II-Reactions in Blue-Green Algae by the Antisera to Lutein and Neoxanthin

1977 ◽  
Vol 32 (1-2) ◽  
pp. 118-124 ◽  
Author(s):  
Georg H. Schmid ◽  
Helga List ◽  
Alfons Radunz
Keyword(s):  
Electron Transport ◽  
Photosystem Ii ◽  
Green Algae ◽  
Higher Plants ◽  
Algal Species ◽  
Nostoc Muscorum ◽  
Blue Green Algae ◽  
Oscillatoria Chalybea ◽  
Electron Donation ◽  
Tetramethyl Benzidine

An antiserum to lutein agglutinates thylakoids of Nostoc muscorum and Oscillatoria chalybea. From this it follows that lutein is located in the outer surface of the thylakoid membrane of these blue-green algae. The same result is obtained for an antiserum to neoxanthin. As neoxanthin is supposed not to occur in blue-green algae it follows that in this case the antibody action should be directed towards a carotenoid with allenic structure. The antisera to lutein and neoxanthin inhibit in both investigated algal species photosynthetic electron transport on the oxygen-evolving side of photosystem II. Moreover, the inhibition sites of both antisera are identical in Nostoc muscorum and are located between the sites of electron donation of the artificial electron donors tetramethyl benzidene and diphenylcarbazide. In the case of the blue-green alga Oscillatoria chalybea the inhibition sites of both antisera differ. Whereas the inhibition site of the antiserum to neoxanthin lies again between the sites of electron donation of tetramethyl benzidine and di­phenylcarbazide, the inhibition site of the antiserum to lutein appears to be situated at least partially beyond the site of electron donation of tetramethyl benzidine. The degree of inhibition of electron transport reactions with Nostoc muscorum is for both antisera 50 - 60 per cent and is pH-dependent. The pH-optimum lies at pH 7.2 for the antiserum to neoxanthin and at 7.8 for the antiserum to lutein. In comparison to this data the same antisera inhibit electron transport in chloroplasts from higher plants only by 20%. This low degree of inhibition in higher plants is apparently due to the fact that the surfaces of the thylakoids are not accessible to antibodies within the grana. In contrast to this the thylakoid surfaces of blue-green algae are fully accessible because the thylakoids are unstacked. The thylakoids of Oscillatoria chalybea have the tendency towards aggregation. Therefore, the results concerning the accessibility of the carotenoids to antibodies are not so clear cut as with Nostoc muscorum.

Chelating agents and blue-green algae

1974 ◽  
Vol 20 (10) ◽  
pp. 1311-1321 ◽  
Author(s):  
Willy Lange
Keyword(s):  
Microcystis Aeruginosa ◽  
Green Algae ◽  
Chelating Agents ◽  
Algal Species ◽  
Anacystis Nidulans ◽  
Water Soluble ◽  
Nostoc Muscorum ◽  
Artificial Agents ◽  
Blue Green Algae ◽  
Anabaena Circinalis

Many planktonic blue-green algae produce natural chelators which enable them to grow at high pH's in the absence of artificial chelators. The growth of 10 cyanophytes without an added chelator was found to differ widely with the algal species. Bacteria-containing cultures of Anabaena cylindrica, Anacystis nidulans, Lyngbya sp., Microcystis aeruginosa, Nostoc muscorum, and Phormidium foveolarum produced their own chelators and grew just as well as the controls with artificial chelating agents. Bacteria-containing cultures of Anabaena circinalis, Gloeotrichia echinulata, Oscillatoria rubescens, and Aphanizomenon flos-aquae did not produce chelators and, in the absence of artificial agents, grew poorly or perished early. The alga-produced, extracellular chelators were water-soluble and capable of chelating and controlling metal compounds that would exist in colloidal form at pH's above 7. Accordingly, in the absence of artificial chelators, the non-chelator-forming species grew in the filtrates of the chelator-forming algae the same as in the presence of artificial agents. Bacteria were not involved in the formation of natural chelators, since axenic cultures of Anabaena circinalis, Anacystis nidulans, Microcystis aeruginosa, Nostoc muscorum, and Phormidium foveolarum in the absence of artificial chelators performed about the same as the bacteria-associated species. Also, the filtrates of axenic, chelator-forming Anacystis cultures had the same growth-stimulating effect on non-chelator-forming species as filtrates from bacteria-associated cultures. The natural chelators showed partial thermolability.While the growth of chelator-forming species in the absence of artificial chelators was normal during the logarithmic phase, a peculiar, continuing production of total organic matter was observed with strongly declining cell numbers of Lyngbya, Microcystis, and Phormidium. The terminal cultures of these species were gelatinous, owing to the presence of extracellular matter, probably consisting of polysaccharides.

Interaction of Photosynthetic and Respiratory Electron Transport in Blue-Green Algae: Effect of a Cytochrome c-553 Specific Antibody

1984 ◽  
Vol 39 (6) ◽  
pp. 623-626 ◽  
Author(s):  
Irene Alpes ◽  
Erwin Stürzl ◽  
Siegfried Scherer ◽  
Peter Böger
Keyword(s):  
Electron Transport ◽  
Cytochrome C ◽  
Oxygen Uptake ◽  
Green Algae ◽  
Specific Antibody ◽  
Nostoc Muscorum ◽  
Membrane Material ◽  
Specific Antibodies ◽  
Blue Green Algae ◽  
Respiratory Electron Transport

An antibody prepared against purified cytochrome c-553 from Nostoc muscorum inhibits the redox function of cytochrome c-553 as checked by a diaphorase assay. 20 to 30% inhibition of NADPH-driven respiratory and light-induced oxygen uptake by Nostoc thylakoids is observed when cytochrome c-553 specific antibodies were applied. However, only 30 to 50% of the total cytochrome c-553 content is released from isolated membrane material, thus being accessible to antibodies. Supplementing the isolated membrane material with excess Nostoc cytochrome before adding the antibody abolishes inhibition. The data provide further evidence for soluble cytochrome c-553 being a link between photosynthetic and respiratory electron transport in blue- green algae.

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