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  • 1
    Electronic Resource
    Electronic Resource
    Isolation and activity of the photodynamic pigment hypericin (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 8 (1985), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Hypericin, a photodynamic pigment, occurring in members of the Hypericaceae, can induce photosensitivity in grazing animals. The pigment has been isolated from the glandular trichomes located on the calyx of Hypericum hirsulum. Hypericin is shown to be capable of sensitizing the photo-oxidation of methyl linolenate. This activity is reduced in the presence of crocin, a carotenoid. Evidence for the generation of singlet molecular oxygen by hypericin is provided by the monitoring of oxygen consumption during the photosensitized oxidation of imidazole. Rates of oxygen consumption were modified by deuterium oxide and sodium azide. The photodynamic action of hypericin on pea leaf discs results in the promotion of photo-oxidative damage, measured by pigment loss and ethane production. These results are discussed in relation to the possible function of hypericin within the plant and the role of photo-dynamic reactions in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1985.tb01204.x
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  • 2
    Electronic Resource
    Electronic Resource
    The Contribution of Photosynthesis to Chlorophyll Formation in Etiolated Mung Bean Leaves (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: Chlorophyll formation in seven day old etiolated mung bean leaves was inhibited by CMU. The inhibition was reversed by feeding sucrose, or by leaving the cotyledons attached to the leaves. Photosynthesis appeared to contribute substrates for further chloroplast development soon after its commencement. When sucrose was fed in the presence of CMU at a range of light intensities, there was a distinct light induced promotion of chlorophyll formation at light intensities of 500–2000 lux. Treatment of the leaves with salicyl-aldoxime, an inhibitor of cyclic photophosphorylation indicated that this process could play an important part in chloroplast development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1971.tb01090.x
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  • 3
    Electronic Resource
    Electronic Resource
    Chloroplast protection in greening leaves (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 65 (1985), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Changes in photosynthetic activity, leaf pigments and the activities of enzymes that scavenge damaging oxygen species in chloroplasts were followed during the greening of 8-day-old etiolated pea (Pisum sativum L. cv. Meteor) seedlings. Accumulation of chlorophyll and carotenoids was accompanied by development of photosynthetic activity. Carotenoids present in etiolated leaves, and the high ratio of carotenoid to chlorophyll detected during the early hours of greening are suggested to provide important protection against singlet oxygen. Superoxide dismutase, ascor-bate peroxidase and glutathione reductase, which scavenge superoxide and hydrogen peroxide in chloroplasts, are present at high activities in etiolated leaves and throughout greening. The mechanisms by which developing chloroplasts may generate damaging oxygen species, and the role of these scavengers during greening is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1985.tb08662.x
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  • 4
    Electronic Resource
    Electronic Resource
    Inter-organ Control of Chlorophyll Synthesis in Primary Leaves of Dark-grown Phaseolus aureus (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 34 (1975), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The changing roles of the cotyledons and hypocotyl in the development of dark-grown Phaseolus aureus seedlings are described. The effect of the cotyledons on total chlorophyll synthesis declined with age, but on a chlorophyll per gram fresh weight basis this was less pronounced. In five-day-old plants the hypocotyl was more effective than the cotyledons in increasing the chlorophyll level, and together their effect was less than additive. The promoting factors in the cotyledons were at a saturating level at this stage. The relationship between the effects of the two organs is discussed with particular reference to the components which they supply to the leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb01849.x
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  • 5
    Electronic Resource
    Electronic Resource
    Chlorophyll formation and the development of photosynthesis in dark grown seedlings of Picea abies (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 49 (1980), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Seeds of Picea abies were germinated and grown in either darkness or constant light. The chlorophyll content and photosynthetic carbon dioxide uptake of developing seedlings of different ages was determined. Ten-day-old dark grown seedlings showed an instant ability for photosynthetic carbon dioxide uptake and also formed further chlorophyll most rapidly upon subsequent illumination. These activities progressively diminished when the dark growth period was extended. Light grown seedlings reached a maximum chlorophyll level after 15 days growth, and this preceded maximal photosynthetic development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb03337.x
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of glyphosate on selected plant processes (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 23 (1983), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Biochemical effects of glyphosate have been examined with a variety of plant materials using mostly merislematic or actively growing tissues. The accumulation of chlorophyll was severely retarded and photosynthetic CO2 uptake was inhibited to a lesser extent. These inhibitory effects could not be alleviated by the simultaneous admixture of divalent cations. Glyphosate enhanced the initial substrate-induction of nitrate reductase, but repressed induction of nitrite reductase, in Ihe latter case correlating with both inhibition of chlorophyll accumulation and CO2 uptake. Inhibition of macromolecule synthesis in single node buds of Agropyron repens(L.) Beauv. was due partly to inhibition of 14C-precursor uptake. The specific activity of soluble acid phosphatase was enhanced as was the evolution of ethane. Ethylene production was not greatly affected. A marked decrease in microsomal protein was observed but the specific activities of several microsomal enzymes did not decline. Glyphosate had little inhibitory effect on the activity of microsomal ATPases in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1983.tb00535.x
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  • 7
    Electronic Resource
    Electronic Resource
    Modifications of chloroplasts of flax cotyledons treated with monuron: myelinoid figures formed under low light conditions (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. Monuron treatment of flax cotyledons in the dark and at a low light intensity of 0.2 Wm−2 caused a retardation of chlorophyll breakdown. With low light, carotenoid breakdown occurred more rapidly, suggesting a possible overloading of the carotenoid protective system, but in darkness chlorophyll loss was first. The ultrastructure of treated leaves was markedly altered. In the dark, monuron caused a swelling of the chloroplasts and a subsequent disruption of the thyl-akoids resulting in a concentric membrane formation in the stroma. Following envelope rupture the thylak-oid system was visible as a myelinoid figure in the cytoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11581486
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  • 8
    Electronic Resource
    Electronic Resource
    The interaction of a gibberellin and a kinin in the control of chlorophyll synthesis (1972)
    Springer
    Cellular and molecular life sciences 28 (1972), S. 1113-1113 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Resumé La promtion synergétique et l'inhibition de la synthèse de la chlorophylle par la gibberelline (GA3) et par la 6-benzylaminopurine (6-BAP) de concentrations diverses, fut observée. L'augmentation de la concentration de 6-BAP réduisit la concentration de GA3 nécessaire pour obtenir la promotion maximum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01918707
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  • 9
    Electronic Resource
    Electronic Resource
    Inhibition of paraquat phytotoxicity by a novel copper chelate with superoxide dismutating activity (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 1295-1296 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A chelate with superoxide dismutase activity, D-penicillamine copper complex, was shown to inhibit paraquat toxicity in flax cotyledons (Linum usitatissimum var. Reina). Paraquat-stimulated chlorophyll loss and ethane production were markedly reduced by this complex. The role of superoxide in the action of paraquat is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01963967
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  • 10
    Electronic Resource
    Electronic Resource
    The photosynthetic capacity of pea leaves with a controlled chlorophyll formation (1970)
    Springer
    Planta 94 (1970), S. 282-290 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The relationship between chlorophyll content and photosynthesis as measured in whole leaves by CO2 uptake and by the component reactions of the electron transport chain of isolated chloroplasts, has been investigated. Leaves with a retarded chlorophyll formation, brought about by treatment with chloramphenicol, terramycin or by a low light intensity, were compared with control leaves (i) illuminated for a similar period of time, and (ii) with a similar chlorophyll content. There appeared to be no direct relationship between chlorophyll content and photosynthetic rate. It is suggested that CO2 uptake in low light treated leaves was limited by lack of enzymes, which are formed as a response to the supply of photosynthetic products. With terramycin and chloramphenicol the limiting factors may also be lowered enzyme levels, caused by specific protein synthesis inhibition. It is suggested that a component of Light System II required a high light intensity stimulation, and its formation was inhibited by chloramphenicol. The synthesis of a substance linking Light Systems I and II appears to be closely associated with chlorophyll formation, and could well be plastoquinone. Structural damage to the intermediate chain between Light Systems I and II is also apparently induced by chloramphenicol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00385760
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