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  • 1
    Electronic Resource
    Electronic Resource
    Dormancy Regulators in Woody Plants: Isolation of the Inhibitor varying with Photoperiod in Acer pseudoplatanus (1963)
    [s.l.] : Nature Publishing Group
    Nature 199 (1963), S. 875-876 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SEEDLINGS of Acer pseudoplatanus show marked photo-periodic responses in relation to dormancy1. Under short days the seedlings rapidly cease extension-growth and form resting-buds, whereas under long days extension-growth is more prolonged. The possibility that the dormancy of buds and other ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/199875a0
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  • 2
    Electronic Resource
    Electronic Resource
    Fungitoxicity of plant growth regulators (PGRs) and PGR/fungicide mixtures in soak treatments to Septoria apiicola pycnidiospores (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 38 (1989), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Mixtures of the plant growth regulators (PGRs) gibberellins A4 and A7 (GA 4/7) and ethephon (2-chloroethylphosphonic acid), applied as soak treatments at 20° C for 24 h, were toxic to pycnidiospores of Septoria apiicola on agar, apparently as a result of low pH of their solutions. Ultraviolet spectroscopy showed that the aqueous solubility of the fungicides benomyl and carbendazim increased significantly when buffered at low pH or mixed with aqueous solutions of GA 4/7 and ethephon. This resulted in greater quantities of 14C-labelled fungicides entering celery seeds imbibed in PGR/fungicide mixtures in comparison with fungicides alone.A 24-h seed soak at 20° C in a mixture of aqueous benomyl, GA 4/7 and ethephon eliminated S. apiicola in infected celery seeds. A thiram soak was also effective but PGR mixtures alone did not completely eliminate the pathogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1989.tb01423.x
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  • 3
    Electronic Resource
    Electronic Resource
    The promotive effect on subsequent germination of treating imbibed celery seeds with high temperature before or during drying (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 3 (1980), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract High temperature (32°C) prevented germination of celery seeds even if given after 4 d of germination induction at 17°C in white light, but germination occurred if the seeds were then returned to 17°C. Celery seeds incubated for 3 d at 17°C in white light and then air-dried at 20°C germinated slowly when re-sown at 17°C in the light, achieving only 24% germination after 21 d. Exposure of such seeds to 32°C prior to and during drying resulted in 50% germination after 3.6 d at 17°C in white light, with no loss in viability, compared to 5.7 d for seeds not given a germination induction treatment. If celery seeds were dried rapidly germination was poor, an effect which could be overcome by high temperature treatment. It is suggested that the mechanism which imposes dormancy at 32°C also conditions the seed to withstand desiccation damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11587030
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of temperature and drying rate during dehydration of celery seeds on germination, leakage and response to gibberellin and cytokinin (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 54 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A high temperature treatment of 32°C which prevents dehydration injury in celery seeds imbibed for 3 days at 17°C and then dried at 20°C, reduced leakage during rehydration, compared with seeds not given the high temperature treatment. Treatments which would normally release celery seeds from dormancy, such as low temperature imbibition or gibberellin (GA4/7) and benzyladenine (BA) applications had little effect on the germination of seeds exhibiting desiccation injury. However, GA4/7 did induce splitting of the seed coat and swelling of the endosperm, and this effect was enhanced by BA. It is suggested that in celery seeds high temperature prevents irreversible embryo damage, including membrane damage, caused by drying.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb00580.x
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  • 5
    Electronic Resource
    Electronic Resource
    Thermodormancy in Celery Seeds and its Removal by Cytokinins and Gibberellins (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 42 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Imbibition of celery (Apium graveolens L.) seeds at 32°C for up to 96 h lowered the upper temperature limit for germination. If this high temperature treatment was given in the light, these seeds germinated slightly earlier than those treated in the dark although the final percentage germination was similar for both treatments. The inhibitory effect of the high temperature treatment was completely removed by allowing the seeds to imbibe in a mixture of the gibberellins A4 and A7 (GA4/7) and partially removed by the cytokinin N6-benzylaminopurine (BA). GA4/7 was less effective when added before rather than after the high temperature treatment, whereas the opposite was true of BA. At constant temperatures more GA4/7 was required to promote germination as the temperature was raised but addition of BA reduced the concentration of GA4/7 required. A model is proposed for the control of celery seed germination by light and temperature through the action of endogenous cytokinins and gibberellins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb04104.x
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  • 6
    Electronic Resource
    Electronic Resource
    Enhancement by Low pH of Gibberellin Effects on Dormant Celery Seeds and Embryoless Half-Seeds of Barley (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 37 (1976), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The action of gibberellins on celery (Apium graveolens L.) seed germination and the release of reducing sugars from barley (Hordeum vulgare L.) seed endosperm were enhanced by decreasing the pH of the incubation solution to below the pKa point. In most cases, low pH was obtained by mixing the solution with weak acids such as succinic acid 2.2 dimethylhydrazide (SADH), 2-chloroethylphosphonic acid (CEPA), or citric acid. However, lowering the pH of the gibberellin solution with strong acid (HCl) also increased markedly the activity of low concentrations of GA4/7. The synergistic action of ethylenediaminetetraacetic acid (EDTA) with gibberellin was not dependent on the pH level of the incubation solution. The response of celery seeds to gibberellins was increased when their distal ends were removed: solution pH and EDTA had no effect on this response.The possible explanations of the synergism between low pH compounds and gibberellins are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1976.tb03965.x
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  • 7
    Electronic Resource
    Electronic Resource
    13C NMR determination of sugar levels in storage roots of carrot (Daucus carota) (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 63 (1985), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 13C NMR was used to detect sugars in detached fibrous and storage roots of carrots (Daucus carota L. cv. Chantenay Red-Cored). The relative amounts of sucrose, glucose and fructose in storage roots of two ages and in fibrous roots were similar to those detected by a destructive, enzymatic sugar determination method. In tap roots all three sugars were present with glucose being marginally predominant in 8-week-old roots and sucrose being the major sugar present in 12-week-old roots. Glucose was the major sugar present in fibrous roots with small amounts of sucrose and no fructose detected. The results indicate that with some instrumental modification, 13C NMR could be used as a non-destructive method for measuring sugar levels in intact storage root systems during development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1985.tb04266.x
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  • 8
    Electronic Resource
    Electronic Resource
    Relationship between Position on the Parent Plant and Dormancy Characteristics of Seeds of Three Cultivars of Celery (Apium graveolens) (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 45 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Germination and seedling emergence studies were made on seeds harvested from four different umbel positions of three cultivars of celery (Apium graveolens L.). Although heavier seeds were produced from primary umbels than from other umbels, these were less viable as measured by the germination percentage at I8°C in the light. However, germination of viable seeds from quaternary umbels was lower than that of seeds from primary umbels at 18°C in the dark when incubated with GA4, (2 × 10 −4M) and seed from secondary and tertiary umbels tended to be intermediate in response. All viable seeds germinated when N6-benzyladenine (10−2M) was used in combination with GA4. Seeds from quaternary umbels of two of the cultivars had a lower high-temperature limit for germination in the dark than did seeds from other umbels. In glasshouse experiments the emergence of viable ‘quaternary’ seeds of these cultivars was higher than that of ‘primary’ seeds. Under these conditions the time to 50% of the final emergence as determined after 42 days was similar for seeds from all umbel positions within each cultivar. In two varieties seedling weights were greater from seeds of primary as compared to quaternary umbels, and in general, the largest seedlings arose from the heaviest seeds and the smallest from the lightest seeds in all three cultivars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb02620.x
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  • 9
    Electronic Resource
    Electronic Resource
    Residual effects of High Temperature Pre-Treatments on the Germination of Celery Seeds (Apium graveolens) (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 47 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Celery seeds (Apium graveolens L.) were allowed to imbibe in the dark for different periods at 28. 32. 37 or 41°(the high temperature pre-treatmem or HTP) prior to transfer to 15, 17, 19.5 or 22°C in white light (the low temperature treatment or LTT). The effect of HTP's at 28. 32 and 37°C was to lower the upper temperature limit for germination and this effect increased with increase in the temperature and duration of the HTP. Increasing exposure to an HTP of 41 °C, however, did not appear to lower the upper temperature limit for germination but reduced the viability of the seeds. This trend of increased inhibition of germination caused by increasingly higher temperatures was reversed when the transfer was to a 22°C LTT after a 4 day HTP at 37°C.When the temperature of (he HTP was relatively low and transfer was to a low LTT. or if the HTP was of a brief duration, the rate of germination was increased as compared to seeds not given an HTP. However, when the temperature and duration of the HTP were increased, the rate of germination became slower than that of seeds not given an HTP, i.e. the time taken for the seeds to recover from the HTP-induced dormancy increased with the temperature and duration of the HTP. The decrease in the germination rate was caused by a delay in the start and not a slowing of the rate of embryo elongation within the seed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb06515.x
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of Different Cytokinins on the Germination of Lettuce (Lactuca sativa) and Celery (Apium graveolens) Seeds (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 37 (1976), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The naturally occurring cytokinins, zeatin, zeatin riboside and dihydrozeatin did not promote the germination of celery (Apium graveolens L.) seeds and 6-Δ2-isopentenyladenine (2iPA) and its riboside were only moderately active. Of the synthetic cytokinins, kinetin, kinetin riboside, and the disubstituted urea, N-phenyl-N′-pyridyl urea (NC5392) were moderately active, and 6-benzyl-aminopurine (BA) and its derivatives BA riboside and 6-benzyl-amino-9(tetrahydropyran-2yl)purine (SD8339) were the most active cytokinins tested. 6-(o-hydroxybenzyl)aminopurine (hyd-BA) and its naturally occurring riboside inhibited germination under normally inductive conditions.All the cytokinins examined were more active in promoting germination of lettuce (Lactuca sativa L.) than celery seeds. BA, BA riboside and SD8339 were again the most active cytokinins. In contrast to the results with celery, zeatin and zeatin riboside were highly active. The other cytokinins also showed high activity with the exception of dihydrozeatin, hyd-BA and hyd-BA riboside which were less active. Cytokinin ribosides were less active than the corresponding free bases during the early period of the lettuce seed incubation but total germination after 90 h was similar.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1976.tb01865.x
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