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  • N-nitroso-N-ethylurea
  • Oryza sativa
  • Springer  (6)
  • Institute of Physics
  • International Union of Crystallography
  • Wiley
  • 2000-2004  (4)
  • 1955-1959  (2)
Collection
Keywords
Publisher
  • Springer  (6)
  • Institute of Physics
  • International Union of Crystallography
  • Wiley
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Growth Inhibitory Effects of Nutgrass (Cyperus rotundus) on Rice (Oryza sativa) Seedlings (2000)
    Springer
    Journal of chemical ecology 26 (2000), S. 2221-2231 
    Details
    ISSN: 1573-1561
    Keywords: Rice ; Oryza sativa ; nutgrass ; Cyperus rotundus ; growth inhibition ; allelopathy ; plant phenolics ; fatty acids ; GC-MS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Growth inhibitory effects of aqueous extracts and leachates of leaves and tubers of Cyperus rotundus L. were investigated by using rice (Oryza sativa L.) seedling as a bioassay material. Both the extracts and leachates of Cyperus were inhibitory to the growth of rice seedlings. Growth inhibition was more pronounced in the presence of aqueous extracts than the leachates. The extract and leachate of leaves had higher total phenolic contents than those of the tubers. Soil amendment with fresh leaves of Cyperus reduced plant height, leaf area, and root and shoot weight of rice seedlings. Total phenolic content was higher in soil amended with fresh Cyperus leaves than the unamended control soil. Nineteen compounds were tentatively identified from the aqueous extracts of leaves and tubers by ethyl acetate extraction followed by gas chromatography–mass spectroscopy (GC-MS). Dicarboxylic, phenolic, and fatty acids were the major compounds. Our results suggest that Cyperus may affect the growth and establishment of rice seedlings after sowing or transplanting, especially when Cyperus plants are mixed in soil during land preparation by ploughing in rain-fed rice culture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005532802836
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  • 2
    Electronic Resource
    Electronic Resource
    Selection of hydroxyproline-resistant proline-accumulating mutants of cauliflower (brassica oleracea var. botrytis) (1955)
    Springer
    Euphytica 85 (1955), S. 329-334 
    Details
    ISSN: 1573-5060
    Keywords: curd culture ; frost tolerance ; N-nitroso-N-ethylurea ; proline accumulation ; mutagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A procedure is described by which hydroxyproline-resistant lines could be selected from regenerating curd tissue of cauliflower. Mutagenesis was by N-nitroso-N-ethylurea, supplied as a drop of 0.3 mM solution on each 3 mm diameter curd piece. The mutagen generated numerous morphological and pigment mutations without significantly affecting shoot regeneration from explants. Thirty one resistant shoots were recovered from more than six thousand explants mutagenised on regeneration medium supplemented with 3 mM hydroxyproline, while none was obtained from a similar number of non-mutagenised controls. Out of twenty-three resistant shoots which survived subculture, only one showed consistently elevated levels of endogenous proline. During early shoot culture passages, proline levels were 3.6–4.7 times higher than controls, but this was reduced to 1.6 times after 10–12 culture passages in the absence of hydroxyproline. Possible reasons for this decline are discussed. Leaf strip assays suggest resistant shoots may be chimeras and current efforts are directed towards regenerating solid mutants from resistant sectors. These will then be evaluated for any alteration in frost tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023963
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  • 3
    Electronic Resource
    Electronic Resource
    Genetic engineering of Indica rice in support of sustained production of affordable and high quality food in developing countries (1955)
    Springer
    Euphytica 85 (1955), S. 441-449 
    Details
    ISSN: 1573-5060
    Keywords: Oryza sativa ; Indica-type rice ; genetic engineering ; vitamin A endosperm ; insect resistance ; virus resistance ; fungus resistance ; essential amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Indica-type rice provides the staple food for two billion people in Third World countries. Several problems involved in the stable and sustained production of high quality food cannot be solved by traditional breeding. Methods have been established for gene transfer to Indica rice breeding lines to study possible contributions from genetic engineering. Experiments are in progress on the development of transgenic resistance towards Yellow Stem Borer, resistance towards Rice Tungro Virus, accumulation of provitamin A in the endosperm, increase of essential amino acids in the endosperm such as lysine, cysteine and methionine and resistance towards fungal pests such as Rice Blast and Sheath Blight. Transgenic clones from Indica rice breeding lines have been recovered from several of the approaches mentioned, some of which have been regenerated to plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023978
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  • 4
    Electronic Resource
    Electronic Resource
    Involvement of Lipid Peroxidation in Water Stress-Promoted Senescence of Detached Rice Leaves (2000)
    Springer
    Biologia plantarum 43 (2000), S. 141-145 
    Details
    ISSN: 1573-8264
    Keywords: antioxidative enzymes ; Oryza sativa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Role of lipid peroxidation and antioxidative enzymes (catalase, peroxidase, superoxide dismutase, ascorbate peroxidase and glutathione reductase) in water stress-promoted senescence of detached rice leaves was investigated. The senescence was followed by measuring the decrease in protein content. Increased lipid peroxidation was closely correlated with senescence in water stressed leaves. Decrease in superoxide dismutase activity was evident 8 h after beginning of water stress. However, decreased catalase, peroxidase, and ascorbate peroxidase activity was observed only when senescence was observed. Glutathione reductase was not affected by water stress. Free radical scavengers retarded water stress-enhanced senescence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026579702967
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  • 5
    Electronic Resource
    Electronic Resource
    Proline, Ornithine, Arginine and Glutamic Acid Contents in Detached Rice Leaves (2000)
    Springer
    Biologia plantarum 43 (2000), S. 305-307 
    Details
    ISSN: 1573-8264
    Keywords: amino acids ; Oryza sativa ; protein ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of water stress on the contents of proline, ornithine, arginine and glutamic acid in detached rice leaves were examined. In water stressed leaves, the content of proline was elevated to a content approximately 8-, 14- and 17-fold higher than in control leaves after 4, 8 and 12 h, respectively. We also observed that omithine and arginine contents were much higher under water stress than in control leaves. However, the content of glutamic acid in water stressed leaves was higher after 4 and 8 h and lower after 12 h than that in control leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002733117506
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  • 6
    Electronic Resource
    Electronic Resource
    The Relation between Accumulation of Abscisic Acid and Proline in Detached Rice Leaves (2000)
    Springer
    Biologia plantarum 43 (2000), S. 301-304 
    Details
    ISSN: 1573-8264
    Keywords: Oryza sativa ; water stress
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relation between abscisic acid (ABA) and proline accumulation was investigated in detached rice (Oryza sativa L.) leaves. In darkness, proline content increased about 2-, 2,5- and 6-fold after 24, 48 and 72 h. ABA content reached maximum after 48 h. In the light, proline content remained almost unchanged until 48 h and subsequently increased slightly. ABA content in the light was lower than in darkness, but the maximum was also after 48 h. During 12-h exposure to decreased air humidity, proline content gradually increased, but ABA content increased about 25-fold after 4 h and declined thereafter. Exogenous application of ABA resulted in an increase in proline content in detached rice leaves under both light and darkness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002781016598
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