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  • ribulose bisphosphate carboxylase  (2)
  • N loss  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of ammonium and nitrate on carbondioxide compensation point and enzymes associated with carbondioxide exchange in wheat (1988)
    Springer
    Photosynthesis research 17 (1988), S. 267-275 
    Details
    ISSN: 1573-5079
    Keywords: glycolate oxidase ; nitrate reductase ; nitrogen nutrition ; phosphoenolpyruvate carboxylase ; photorespiration ; ribulose bisphosphate carboxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The carbondioxide compensation point (Γ), dry matter production, and the activities of nitrate reductase (NR), glycolate oxidase (GO), ribulose 1,5-bisphosphate carboxylase (RuBPC) and phosphoenolpyruvate carboxylase (PEPC) were measured in wheat, grown on media, containing nitrate or ammonium. Significantly higher Γ and lower dry matter was observed in plants supplied with ammonium-nitrogen (NH4-N), as compared to those supplied with nitrate-nitrogen (NO3-N). The activities of NR and PEPC were higher in plants grown on NO3-N than to those grown on NH4-N. There were no significant differences in the activities of GO and RuBPC irrespective of whether NO3-N or NH4-N was supplied. None of the enzymes was found to be associated directly with the Γ.PEPC activity accounted the measured differences in the Γ and biomass production between NH4-N and NO3-N supplied plants. The relationship between PEPC and the Γ is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035453
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of ammonium and nitrate on CO2 assimilation, RuBP and PEP carboxylase activity and dry matter production in wheat (1987)
    Springer
    Photosynthesis research 12 (1987), S. 265-272 
    Details
    ISSN: 1573-5079
    Keywords: ammonium nutrition ; nitrate nutrition ; 14CO2 assimilation ; dry matter production ; phosphoenol pyruvate carboxylase ; ribulose bisphosphate carboxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Photosynthetic14CO2 assimilation, ribulose 1, 5-bisphosphate carboxylase (RuBPC), phosphoenol pyruvate carboxylase (PEPC) and dry matter (DM) production were examined in wheat under varying levels and forms of nitrogen.14CO2 assimilation increased gradually after germination reaching a peak value at anthesis, followed by a sharp decline. A similar pattern was observed for both the carboxylases, RuBPC and PEPC activities. Increase in nitrogen levels, in general, brought about a significant increase over the control (zero-nitrogen) in14CO2 assimilation, RuBPC, PEPC activities and DM production. There were no significant differences in RuBPC activity and14CO2 assimilation with respect to the forms of nitrogen. Significantly higher PEPC activity and DM was observed in plants supplied with nitrate-nitrogen (NO3-N), as compared to those supplied with ammonium-nitrogen (NH4-N). The significance of PEPC activity in C3 photosynthesis is discussed in relation to DM distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00055126
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of rates of nitrogen and relative efficiency of sulphur-coated urea and nitrapyrin-treated urea in dry matter production and nitrogen uptake by rice (1980)
    Springer
    Plant and soil 55 (1980), S. 389-396 
    Details
    ISSN: 1573-5036
    Keywords: Apparent N ; recovery ; Denitrification ; IBDU N ; concentration ; Neem cake ; Nitrification inhibitors ; Nitrapyrin (N-Serve) ; N loss ; N uptake ; Rice ; Sandy clay loam ; Slow-release ; N fertilizers ; Sulphur-coated urea ; Urea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A field experiment conducted for two rainy seasons (1974 and 1975) on a sandy clay loam soil at the Indian Agricultural Research Institute, New Delhi showed that at 100kg N/ha the apparent recovery of urea nitrogen by the rice crop was only 28%, which was raised to 41.7% by treating urea with Nitrapyrin and to 47.4% by coating urea withneem (Azadirachta indica Juss) cake. The recovery with sulphur-coated urea was 37.7%. Dry matter production nitrogen concentration in plant and uptake by rice were increased as the rate of nitrogen was increased from 0 to 150kg N/ha. Advantage of treating urea with Nitrapyrin or coating withneem cake was seen more in grain than straw yield.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182699
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