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  • 1
    Electronic Resource
    Electronic Resource
    A class of glyphosate-selected mutants of the cyanobacterium Nostoc muscorum showing loss of ammonium transport activity (Amt−), heterocyst formation (Het−) and nitrogenase activity (Nif−) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 60 (1989), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Glyphosate was considerably more growth inhibitory to N2-assimilating than to ammonium-assimilating cultures of N. muscorum. The herbicide, while inhibiting nitrogenase activity and ammonium [14C]-methylammonium) uptake activity caused significant increase in the biosynthetic activity of in vivo glutamine synthetase (GS) in N2-assimilating or ammonium-assimilating cultures and nearly 50% derepression of heterocyst formation and nitrogenase activity in ammonium assimilating cultures. The differential toxicity of the herbicide to N2-fixing cultures led us to use this herbicide as selective agent to isolate a class of mutant clones on ammonium-supplemented medium which lacked heterocyst differentiation (Het−), nitrogenase activity (Nif−) and ammonium [14C]-methylammonium) uptake activity (Amt−). It is concluded that heterocyst differentiation, nitrogenase activity and ammonium uptake activity are all under the regulatory control of common genetic determinants in the cyanobacterium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1989.tb03443.x
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  • 2
    Electronic Resource
    Electronic Resource
    Differential Photosynthetic Acclimation Pattern to Limiting Growth-Irradiance in Two Types of C4 Plants (2000)
    Springer
    Photosynthetica 38 (2000), S. 267-273 
    Details
    ISSN: 1573-9058
    Keywords: chlorophyll amount and fluorescence ; cytochrome b 6/f ; electron transport rates ; net photosynthetic rate ; photosystems 1 and 2 ; quantum efficiency of photosystem 2
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic acclimation to reduced growth irradiances (650 and 200 µmol m−2 s−1) in Eleusine coracana (L.) Garten, a nicotinamide adenine dinucleotide-malic enzyme (NAD-ME) C4 species and Gomphrena globosa L., a nicotinamide adenine dinucleotide phosphate-malic enzyme (NADP-ME) C4 species were investigated. E. coracana plants acclimated in 4 and 8 d to 650 and 200 µmol m−2 s−1, respectively, whereas G. globosa plants took 8 and 10 d, respectively, to acclimate to the same irradiances. The acclimation to reduced irradiance was achieved in both species by greater partitioning of chlorophyll towards the light-harvesting antennae at the expense of functional components. However, magnitude of increase in the light-harvesting antenna was higher in E. coracana as compared to G. globosa. Superior photosynthetic acclimation to reduced irradiance in G. globosa was due to the smaller change in functions of the cytochrome b 6/f complex, photosystem (PS) 1 and PS2 leading to the higher carbon fixation rates compared to E. coracana.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007246314876
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    Paper (German National Licenses)
    Fulltext
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