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  • 1970-1974  (7)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Translocation of Photosynthates in Tall and Dwarf Varieties of Pea, Pisum sativum (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 25 (1971), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Quantitative studies of the translocation of radiocarbon from a young expanded leaf of two tall varieties (Improved Pilot and Thomas Laxton) and two dwarf varieties (Little Marvel and Meteor) of Pisum sativum showed that 40 to 45 per cent of the radiocarbon was exported from the 14CO2 treated leaf after 24 hours in all four varieties. Although substantial export to the upper shoot always occurred it was more marked in the two tall varieties. Pre-treatment with GA did not affect total fixation but increased total export from the 14CO2 treated leaf in cv. Meteor and decreased it in cv. Improved Pilot. GA had no effect on the translocation pattern in the tall plants but modified that of the dwarf plants to correspond to that found in the tall varieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1971.tb01460.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Fixation of CO2 and Export of Photosynthate by the Carpel in Pisum sativum (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 23 (1970), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Pods of Pisum sativum cv. Meteor were supplied with 14CO2 and the fixation and distribution of the radiocarbon studied. A high fixation rate was found in all of the treated pods. In intact control plants about 60 per cent of the total radiocarbon fixed was exported from the carpet into the seeds of the treated pod in the 24 hour period following fixation. Almost all of the remainder was relained in the carpel itself. It was found that the seeds in the treated pod were the major sink for these fixation products and that the weight of the seed determined the level of import of radiocarbon from the carpel in both attached and detached pods. Removal of the seeds from the treated pod prior to 14CO2 treatment reduced export from the fed carpel from 60 to 15 per cent, this being distributed mainly in the other pods and stem fractions. It appears that carpet photosynthate is likely to be of great importance in the growth and development of seeds enclosed by the carpel. control of fixation and export of radiocarbon seemed to be a function of the carpel and the seeds enclosed by the carpel and to be relatively independent of the rest of the plant. This could explain the absence of effect of GA on these processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1970.tb06421.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The Effects of Benzylaminopurine on Growth and 14Carbon Translocation in Excised Mustard Cotyledons (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 23 (1970), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When localized areas of blades of recently excised mustard cotyledons were fed with 14CO2 it was found that the fixation products passed rapidly into the veins and then were translocated to the petiole. Since other cotyledons similarly treated subsequently rooted at the petiole base, this suggested that it acted as a sink for assimilates. Treatment of excised cotyledons with benzylaminopurine (BAP) resulted in the enhancement of blade growth and the suppression of root initiation and development. Quantitative determinations of labelled assimilate in both the cotyledon blade and the terminal 2 mm portion of the petiole were made. It was found that cotyledons treated with BAP at a concentration high enough to suppress completely root initiation had a higher level of radioactivity in the petiole base than the terminal segments in untreated petioles, whether expressed as specific activity or as a percentage of the total radiocarbon fixed. BAP-treated cotyledons also fixed consistently higher levels of 14CO2, probably due to an increase in photosynthetic area. The results suggest that BAP alters the pattern of differentiation at the base of the petiole rather than the polarity of movement of assimilates to the petiole base.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1970.tb06406.x
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  • 4
    Electronic Resource
    Electronic Resource
    Control of Rooting and the Pattern of Senescence in Detached White Mustard Cotyledons (1970)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 23 (1970), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Senescence of detached mustard cotyledons was greatest in full light or at low light intensity but was reduced at intermediate light intensities. The location of yellowing in the blade depended on the conditions in which it was maintained after excision. Cotyledons cultured at full light intensity in the absence of exogenous nutrients formed roots at the base and yellowed around the margins. Reduction in light intensity and increasing nutrient concentrations resulted in an increasing proportion of the cotyledons yellowing from the base upwards, and fewer developed roots. At low light intensity with high nutrient levels rooting was suppressed and basal senescence predominated.The location of yellowing in the cotyledon may be associated with mobilisation gradients induced by the differential effects of light and mineral nutrient level on root initiation and blade growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1970.tb06497.x
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  • 5
    Electronic Resource
    Electronic Resource
    Differential effects of the embryonic axis on chlorophyll production and photosynthesis of mustard cotyledons (1970)
    Springer
    Planta 93 (1970), S. 289-294 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mustard cotyledons detached from the dry seed or at intervals during five days dark germination produced consistently more chlorophyll but a lower photosynthetic rate when maintained in the dark on moist filter paper for 24 hr before exposure to light than cotyledons which were attached to the seedling axis during this time. The results suggest that the embryonic axis exerts a differential effect on the developing photosynthetic system, competing for material involved in chlorophyll formation and at the same time stimulating the development of other photosynthetic components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384102
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  • 6
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    Differential effects of the embryonic axis on chlorophyll production and photosynthesis of mustard cotyledons (1970)
    Springer
    Details
    Publication Date: 1970-01-01
    Print ISSN: 0032-0935
    Electronic ISSN: 1432-2048
    Topics: Biology
    Published by Springer
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  • 7
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    Biology of Plants. (1971)
    Wiley
    Details
    Publication Date: 1971-11-01
    Print ISSN: 0022-0477
    Electronic ISSN: 1365-2745
    Topics: Biology
    Published by Wiley on behalf of British Ecological Society.
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