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  • Nitrogen nutrition  (2)
  • Chemistry  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of nitrogen nutrition on growth and biomass partitioning of annual plants originating from habitats of different nitrogen availability (1992)
    Springer
    Oecologia 92 (1992), S. 236-241 
    Details
    ISSN: 1432-1939
    Keywords: Annual plants ; Biomass partitioning ; Nitrogen nutrition ; Relative growth rate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The hypothesis was tested that faster growth of nitrophilic plants at high nitrogen (N) nutrition is counterbalanced by faster growth of non-nitrophilic plants at low N-nutrition. Ten annual plant species were used which originated from habitats of different N-availability. The species' preference for N was quantified by the “N-number” of Ellenberg (1979), a relative measure of nitrophily. The plants were cultivated in a growth cabinet at five levels of ammonium-nitrate supply. At low N-supply, the relative growth rate (RGR) was independent of nitrophily. At high N-supply, RGR tended to be higher in nitrophilic than in non-nitrophilic species. However, the response of RGR to N-supply was strongly and positively correlated with the nitrophily of species. Increasing N-supply enhanced partitioning to leaf weight per total biomass (LWR) and increased plant leaf area per total biomass (LAR). Specific leaf weight (SLW) and LWR were both higher in non-nitrophilic than in nitrophilic species at all levels of N-nutrition. NAR (growth per leaf area or net assimilation rate) increased with nitrophily only under conditions of high N-supply. RGR correlated positively with LAR, irrespective of N-nutrition. Under conditions of high N-supply RGR correlated with SLW negatively and with NAR positively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317370
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  • 2
    Electronic Resource
    Electronic Resource
    Decreased ribulose-1,5-bisphosphate carboxylase-oxygenase in transgenic tobacco transformed with “antisense” rbcS (1993)
    Springer
    Planta 190 (1993), S. 1-9 
    Details
    ISSN: 1432-2048
    Keywords: Biomass allocation ; Nicotiana ; Nitrogen nutrition ; Photosynthesis ; Relative growth rate ; Ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) ; Transgenic plant (tobacco antisense DNA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Wild-type tobacco (Nicotiana tabacum L.) plants and transgenic tobacco transformed with antisense rbcS to decrease expression of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco; EC 4.1.1.39) were grown at 300 mol-m−2 · s−1 irradiance and 20° C at either 0.1, 0.7 or 5 mM NH4NO3. In high nitrogen (N), growth was reduced in parallel with the inhibition of photosynthesis when Rubisco was decreased by genetic manipulation. In limiting N, photosynthesis was reduced strongly when Rubisco was decreased by genetic manipulation, but growth was hardly affected. At all N levels, decreased expression of Rubisco led to a decrease in the amount of starch accumulated in the leaves. There was a large increase of the specific leaf area (SLA; leaf area maintained per unit dry weight in the leaf) in plants with decreased Rubisco. Increased SLA was associated with an increased inorganic and a decreased carbon contribution to leaf structural dry weight. The increased SLA represents a more efficient investment of photosynthate with respect to maximisation of leaf area and light interception, and partly compensates for the decreased rate of photosynthesis in plants with decreased expression of Rubisco. The changes of starch content and SLA were particularly large in limiting N, when growth rate was effectively independent of the rate of photosynthesis. Increased N availability led to a large increase of the shoot/ root ratio, but only a small increase in SLA. It is argued that N availability and the availability of photosynthate both regulate storage and allocation of biomass to optimize resource utilization, but achieve this via different mechanisms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00195668
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Phosphors. XIX. Zur Kenntnis des Phosphor-sulfid-jodids PSJ3Professor Otto Schmitz-DuMont zum 65. Geburtstage gewidmet (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 327 (1964), S. 124-127 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphorus(III) iodide reacts with sulfur under suitable conditions (PJ3:S8 = 1:1/8; CS2 as solvent; daylight excluded) forming the hitherto unknown crystalline thiophosphoryl iodide, PSJ3. A simpler synthesis is that starting from the three elements dissolved in CS2 and reacting over several days at 0°C and light exclusion.The new compound decomposes at 20°C into P4S7, PJ3 and J2, light and heat accelerating this decomposition. From IR and Raman investigations, the symmetry of the PSJ3 molecule is supposed to be C3v.
    Notes: Phosphor(III)-jodid reagiert mit Schwefel im Molverhältnis 1 PJ3: 1/8 S8 in Schwefelkohlenstoff unter Lichtausschluß zu dem bisher unbekannten, kristallinen Phosphor-sulfidjodid PSJ3. Noch einfacher gelingt die Synthese des PSJ3 aus den Elementen im entsprechenden stöchiometrischen Verhältnis in Schwefelkohlenstoff durch mehrtägiges Stehen unter Lichtausschluß bei 0°C. Die reine Verbindung zersetzt sich bei 20°C innerhalb weniger Stunden unter Oxydo-Reduktion zu Tetraphosphor-heptasulfid, Phosphor(III)-jodid und Jod, wobei Licht und Wärme die Umwandlung begünstigen. Die molekülspektroskopischen Befunde stehen mit der angenommenen Symmetrie C3v der PSJ3-Molekel im Einklang.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643270304
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