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  • 1
    Electronic Resource
    Electronic Resource
    The Shapes and Sizes of Seeds (1970)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 1 (1970), S. 327-356 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.01.110170.001551
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Endogenous Sugar Levels and Their Effects on Root Formation and Petiole Yellowing of Detached Mustard Cotyledons (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 31 (1974), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Detached cotyledons of Sinapis alba rooted readily in water in petri dishes in the light. The addition of (6 × 10−2M) galactose, mannose or 2-deoxy-D-glucose to the culture medium proved toxic to cotyledon growth. Of the other sugars tested that were not toxic, sucrose was the most inhibitory to root formation and increased petiolar yellowing to the greatest extent. Glucose was more inhibitory than fructose which in turn increased petiolar yellowing more than methyl-D-glucose.Sucrose, glucose, or fructose at 6 × 10−2M in the culture medium gave rise to very substantial increases in the cotyledon petiole of reducing sugar and starch with smaller increases in sucrose. Methyl-D-glucose had much less effect on internal sugar levels. It was found that the higher the internal level of glucose the more rapid the rate and final extent of petiolar yellowing. In general, the degree of petiolar yellowing was inversely related to the ability of the cotyledon to root. Methyl-D-glucose differed from the other sugars in that it delayed and reduced root formation but had very little effect on petiolar yellowing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1974.tb03697.x
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  • 3
    Electronic Resource
    Electronic Resource
    Some Effects of Triazines on Growth, Photosynthesis and Translocation of Photosjuthate in Pinus Species (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 33 (1975), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effects of triazines on growth, 14CO2-fixation and translocation of 14C-assimilates by young Pinus seedlings were investigated. Post-emergenceroot application of moderate and high concentrations of simazine and atrazine resulted in severe toxicity to the seedlings of Pinus nigra and P. coniorta as depicted by reduction in dry weight, chlorosis, wilting and mortality. Atrazine was more toxic than simazine and P. nigra was more susceptible than P. contorta to both the triazines. Simazine treatment to the roots of P. nigra seedlings, not only caused inhibition of 14CO2-fixation but also reduced the short-term downward transloca-tion of l4 C-assimilates. Various possible mechanisms whereby simazine reduced the downward movement of I4C-assimilates in Pinus seedlings are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb03172.x
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  • 4
    Electronic Resource
    Electronic Resource
    Concanavalin A-mediated agglutination of plant plastids (1978)
    Springer
    Planta 138 (1978), S. 35-39 
    Details
    ISSN: 1432-2048
    Keywords: Agglutination ; Chloroplasts ; Concanavalin A ; Cucumis ; Pisum ; Pyrus ; Proplastids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cucumber (Cucumis sativus L.) and pear (Pyrus domestica Medik.) fruit proplastids, and pea (Pisum sativum L., cv. Meteor) leaf chloroplasts, extracted by osmotic rupture of protoplasts isolated after degradation of the cell walls by cellulase and pectinase, agglutinated in the presence of Con A. Agglutination of cucumber proplastids was inhibited by anti-Con A and by methyl α D-gluco/manno pyranosides but not by methyl α D-galactopyranoside. Fluorescein isothiocyanate-conjugated Con A (FITC-Con A) rendered agglutinated clumps fluorescent. If cellulase was omitted from the macerating medium, Con A-mediated agglutination did not occur even if proplatids were subsequently incubated with cellulase. Proplastids and chloroplasts extracted by conventional mechanical disruption methods were not agglutinated by Con A and did not acquire fluorescence with FITC-Con A. However, cucumber proplastids so extracted could be agglutinated by Con A if incubated with cellulase after preparation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392911
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on flower longevity in Digitalis (1979)
    Springer
    Planta 146 (1979), S. 409-414 
    Details
    ISSN: 1432-2048
    Keywords: Corolla abscission ; Digitalis ; Flower longevity ; Pollination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Flower lifespan was terminated by corolla abscission 5–6 days after stigma opening in the unpollinated flower. Increased pollen loads produced increased seed set and reduced flower longevity progressively to a minimum of one day after pollination with pure pollen. Weakening of the abscission zone was detectable 8 h after pollination, whilst the pollen tubes were still within the stigmatic zone, suggesting that a stimulus, moving at 4 mm h−1 minimum, was transmitted through the style and ovary. Soon after pollination removal of the stigma prevented the pollination-induced corolla abscission. Later it was necessary to remove the stigma and upper style, and later still the whole style to delay abscission. The progressive induction of the stigma and style took place at a rate of 1.5 mm h−1, in advance of the pollen tubes which grew at 0.75 mm h−1. It was not possible to reproduce the pollination effects by application of indoleacetic acid (IAA) to the stigma or the style.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380853
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  • 6
    Electronic Resource
    Electronic Resource
    Studies on flower longevity in Digitalis (1983)
    Springer
    Planta 157 (1983), S. 15-21 
    Details
    ISSN: 1432-2048
    Keywords: Abscission ; Corolla (abscission) ; Digitalis ; Ethylene and abscission ; Pollination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The flowers of Digitalis purpurea respond to pollination by rapid corolla abscission without any loss of corolla turgor, nor any significant loss of corolla constituents, relative to the corollas of unpollinated flowers of a similar age. The corollas of unpollinated flowers too eventually abscise, 6 d after the stigma opens, however, they do so with only a minimal loss of fresh weight or corolla constituents. Pollination causes an increase in ethylene production detectable within 1 h. Increased ethylene production occurs initially only from the upper portion of the style, later from the lower portion, and lastly, between 23 and 48 h after pollination, from the ovary plus calyx. The pollination response can be induced by exogenous ethylene, the degree of weakening of the corolla abscission zone being dependent upon the concentration and duration of the exposure period and on the stage of flower development. The regulation of ethylene biosynthesis and its involvement in the control of pollination-induced corolla abscission are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394535
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  • 7
    Electronic Resource
    Electronic Resource
    Book reviews (1977)
    Springer
    Plant ecology 35 (1977), S. 63-64 
    Details
    ISSN: 1573-5052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02097136
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