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  • Azospirillum lipoferum  (2)
  • Blue-green algae  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Differential colonization of Azospirillum lipoferum on roots of two varieties of rice (Oryza sativa L.) (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 3-7 
    Details
    ISSN: 1432-0789
    Keywords: Azospirillum lipoferum ; Mucigel ; Oryza sativa ; Root colonization ; Scanning electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Seedlings of rice (IR42 and IR50) were aseptically dipped into Azospirillum lipoferum strain 34H suspension under dark, and the presence of bacteria on the differentiating regions of rice roots was observed by scanning electron microscopy. The bacterium did not colonize the root tips of IR42, while it colonized this region in the case of IR50, within 24 h after inoculation. In the early stages, most of the bacteria were embedded in the ruptured mucigel below the root cap cells of IR42. Mucigel was hardly detectable in IR50. While the root hair primordia of IR50 were colonized heavily with the bacterium within 24 h, the root hairs of IR42 were colonized 48 and 72 h after inoculation. This phenomenon in relation to plant varietal differences was discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280343
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  • 2
    Electronic Resource
    Electronic Resource
    Genetic control of heterocyst formation in the blue-Green algae Nostoc muscorum and nostoc linckia (1977)
    Springer
    Archives of microbiology 114 (1977), S. 155-159 
    Details
    ISSN: 1432-072X
    Keywords: Blue-green algae ; Nostoc ; Mutants ; Heterocyst and nitrogenase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Non-heterocystous, non-nitrogenfixing (het - nif-), heterocystous, non-nitrogenfixing (het + nif-) and multiple heterocystous, nitrogen-fixing (M-het + nif+) mutants of heterocystous, nitrogen-fixing (het + nif+) wild-type Nostoc muscorum and Nostoc linckia were isolated and characterized with respect to (a) nitrogenfixing activity, (b) reversion frequency, (c) ammonium repressibility of heterocyst formation, (d) heterocyst spacing pattern, and (e) action of L-methionine-DL-sulphoximine (MSO), an inhibitor of glutamine synthetase (GS), on heterocyst regulation. The mutant and revertant results suggest: (i) either involvement of a common genetic determinant in the formation of heterocyst and nitrogenase or the organization of het genes and nif genes in a single operon prone to complete inactivation by a single polar mutation, (ii) non-participation of active nitrogenase in regulation of heterocyst spacing; (iii) involvement of genetic factor(s) in the control of heterocyst spacing pattern in N. linckia, and (iv) apparently different nature of the mechanism of heterocyst inhibition by proheterocyst from that of heterocyst inhibition by NO 3 - or NH 4 + . L-Methionine-DL-sulphoximine inhibits growth and causes heterocyst formation in chains in N. linckia growing in nitrogen-free, NO 3 - , NO 2 - or NH 4 + medium, thus indicating a close physiological linkage between heterocyst and inorganic nitrogen metabolism regulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00410777
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  • 3
    Electronic Resource
    Electronic Resource
    Alteration of cyanobacterial glutamine synthetase activity in vivo in response to light and NH 4 + (1979)
    Springer
    Archives of microbiology 120 (1979), S. 195-200 
    Details
    ISSN: 1432-072X
    Keywords: Blue-green algae ; Cyanobacteria ; Glutamine synthetase ; Light-modulation ; Anabaena cylindrica ; NH 4 + -deactivation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Extractable glutamine synthetase activity of the cyanobacterium Anabaena cylindrica was reduced by approximately 50% when N2-fixing cultures were treated with 10 mM NH 4 + or were placed in darkness. The deactivated enzyme could be rapidly reactivated (within 5 min) by adding 40 mM 2-mercaptoethanol to the biosynthetic reaction mixture. The enzyme could also be reactivated in vivo by replacing the culture in light or by removing NH 4 + . When the enzyme was deactivated by simultaneously adding NH 4 + and placing the culture in darkness, reactivation occurred on reillumination and removal of NH 4 + . The removal of NH 4 + in darkness did not result in reactivation. On in vitro reactivation of glutamine synthetase from dark or NH 4 + -treated cultures the maximum glutamine synthetase activity observed frequently exceeded that of glutamine synthetase extracted from untreated cultures. Anacystis nidulans showed a similar type of reversible dark deactivation to A. cylindrica but Plectonema boryanum and a Nostoc did not. With A. cylindrica, a direct positive correlation between the size of the intracellular pool of glutamate and biosynthetic glutamine synthetase activity occurred during light/dark shifts, and on treatment with NH 4 + . The changes in activity of glutamine synthetase in A. cylindrica in response to light resemble in some respects the light modulation of enzymes of the oxidative and reductive pentose phosphate pathways noted in cyanobacteria by others.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00423065
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  • 4
    Electronic Resource
    Electronic Resource
    Influence of Azospirillum inoculation on the mineral uptake and growth of rice under hydroponic conditions (1988)
    Springer
    Plant and soil 108 (1988), S. 281-285 
    Details
    ISSN: 1573-5036
    Keywords: Azospirillum lipoferum ; hydroponic system ; inoculation ; mineral uptake ; NH4-ion ; Oryza sativa L. ; PO4-ion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Seedlings of rice (Oryza sativa L. var. IR42) were inoculated with nitrogen-fixingAzospirillum lipoferum (strain 34H) by immersing the roots in the inoculum for 6 h. The plants were grown in the prescence of NH4 +-N for 47 days in a hydroponic system under greenhouse conditions. Inoculation significantly enhanced PO4-ion uptake of the plants in 4 of the 7 samplings tested while the uptake of NH4-ion was significantly increased in two samplings and was decreased in one sampling. Inoculation reduced root length significantly and caused significant increases in shoot fresh and dry weights. Root surface area was not affected by inoculation. Bacterial population counts suggested thatA. lipoferum survived on the roots till the end of the experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02375660
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