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  • Nitrogen fixation  (3)
  • Cylindrospermum
  • Gas vacuole
  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen fixation and balance studies of rice soil (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 15-19 
    Details
    ISSN: 1432-0789
    Keywords: Nitrogen fixation ; N-balance studies ; Azolla ; Blue-green algae ; Chemical N fertilization ; Rice
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A nitrogen balance study conducted in ceramic pots under net house conditions for four seasons showed that flooded rice soil leaves a positive nitrogen balance (N increase) in soil after rice cropping in both fertilized and unfertilized soil. Recovery of nitrogen from rice soil was more than its input in unfertilized soil, but it was reverse in fertilized soil. Incorporation of Azolla or BGA twice as basal and 20 days after transplanting (DAT) alone or in combination showed higher nitrogen balance and N2-fixation (N gain) in soil than in that where it was applied once either as basal or 20 DAT. Planted soil showed more N2-fixation than that of fallow rice, and flooded soil fixed more nitrogen in comparison to non-flooded soil in light but less in dark. Soil exposed to light fixed more nitrogen than that of unexposed soil in both flooded and non-flooded conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280345
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Algicidal effect of 2,4-dichlorophenoxy acetic acid on blue-green alga Cylindrospermum sp. (1974)
    Springer
    Archives of microbiology 97 (1974), S. 69-72 
    Details
    ISSN: 1432-072X
    Keywords: Algicidal Effect ; Tolerance to Herbicides ; Blue-Green Alga ; Cylindrospermum ; Growth Effect ; 2,4-Dichlorophenoxyacetic Acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of the herbicide 2,4-Dichlorophenoxy acetic acid generally used in agriculture was studied on the nitrogen fixing blue-green alga Cylindrospermum sp. The alga could tolerate up to 150 μg per ml in liquid culture and 100 μg per ml on agar plates without any inhibitory effect on growth and survival. The maximum tolerance was up to 800 μg per ml and higher concentrations were lethal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403046
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Photoreactivation of UV-irradiated blue-green algae and algal virus LPP-1 (1975)
    Springer
    Archives of microbiology 103 (1975), S. 297-302 
    Details
    ISSN: 1432-072X
    Keywords: Photoreactivation ; UV-Irradiation ; Cylindrospermum ; Plectonema boryanum ; Fischerella muscicola ; Cyanophage LPP-1
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ultraviolet (UV) sensitivity and photoreactivation of blue-green algae Cylindrospermum sp., Plectonema boryanum, spores of Fischerella muscicola and algal virus (cyanophage) LPP-1 were studied. The survival value after UV irradiation of filaments of Cylindrospermum sp. and Virus LPP-1 showed exponential trend and these were comparatively sensitive towards UV than F. muscicola and P. boryanum. Photoreactivation of UV-induced damage occurred in black, blue, green, yellow, red and white light in Cylindrospermum sp., however only black, blue and white light were capable of photorepair of UV-induced damage in P. boryanum, spores of F. muscicola and virus LPP-1 in infected host alga. Pre-exposure to yellow and black light did not show photoprotection. The non-heterocystous and nitrogen fixation-less mutants of Cylindrospermum sp. were not induced by UV and their spontaneous mutation frequency was not affected after photoreactivation. The short trichome mutants of P.boryanum were more resistant towards UV. The occurrence of photoreactivation of UV-induced killing in wide range of light in Cylindrospermum sp. is the first report in organisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00436364
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation of gas vacuole-less mutants of the blue-green alga Anabaenopsis raciborskii (1976)
    Springer
    Archives of microbiology 111 (1976), S. 195-196 
    Details
    ISSN: 1432-072X
    Keywords: Mutation ; Blue-green alga ; Anabaenopsis raciborskii ; Gas vacuole ; Nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From a bloom forming blue-green alga, Anabaenopsis raciborskii, spontaneous mutants, which had lost the ability to form gas vacuoles have been isolated; the mutant frequency was 4.8×10-3. The filaments of gas vacuole-less mutants settled at the bottom of flasks in liquid culture media unlike the parent alga. The growth and nitrogen fixation were comparatively poor in the mutants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446569
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Rice yields as influenced by Azolla N2 fixation and urea N-fertilization (1989)
    Springer
    Plant and soil 114 (1989), S. 63-68 
    Details
    ISSN: 1573-5036
    Keywords: Azolla pinnata ; Nitrogen fixation ; N yield ; Oryza sativa ; Urea-N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Application of 0, 30, 60, 90 and 120 kg N ha−1 of urea (U) in split doses with (and without)Azolla pinnata, R. Brown was studied for three consecutive seasons under planted field condition. Fresh weight (FW), acetylene reduction activity (ARA) and N yield of Azolla were found to be maximum 14 days after inoculation (DAI). Among the different treatments, maximum Azolla growth was recorded in no N control. The FW, ARA and N yield of Azolla were inhibited increasingly with the increase in N levels. Irrespective of season, FW and N yield of Azolla were inhibited only a small extent with 90 kg N ha−1 U, beyond which the inhibition was pronounced. ARA was inhibited only slightly up to 60 kg N ha−1 of U. Grain yield and crop N uptake of rice increased significantly up to 90 kg N ha−1 of U (alone or in combination with Azolla) in the dry seasons (variety IR 36) and up to 60 kg N ha−1 U in the wet season (variety CR 1018).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02203082
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    Paper (German National Licenses)
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