Search Results

13 results

  1. CORESTA Congress, Paris, 2006, APOST 24

    Color and aroma of tobacco: a facilitated approach for their objective evaluation in Oriental tobaccos and for cultivar classification within Virginia and Oriental tobacco types

    DAGNON S.; EDREVA A.; VLADOVSKA A.
    Tobacco and Tobacco Products Institutes, Plovdiv, Bulgaria; D. Kostov Inst. of Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria.
    In the routine practice the evaluation of colour and smoke aroma, major qualitative characteristics of tobacco, is mainly based on organoleptic estimates by expert panels, with this suffering from subjectivity, high costs and health hazards. We propose a ...
  2. Bull. Spec. CORESTA Congress, Lisbon, 2000, p. 67, AP17

    Biochemical changes in ß-cryptogein - elicited tobacco: a possible basis of induced resistance

    EDREVA A.; BLANCARD D.; DELON R.; BONNET P.; RICCI P.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    ß-cryptogein, a proteinaceous elicitor from the phytopathogenic fungus Phytophthora cryptogea, is known to induce leaf necrosis in tobacco and non-specific resistance (expressed in the perinecrotic leaf area) against a wide range of tobacco pathogens, ...
  3. Ann. Tabac, 1997, Sect. 2-29, p. 27-32., ISSN.0399-0354

    A biochemical study of tobacco subjected to cotyledon test : effect of magnesium, reactions of resistant and non resistant plants to Peronospora tabacina. VIII. A cytochemical study of lignin and phenolics

    GEORGIEVA I.D.; DELON R.; EDREVA A.
    D. Kostov Inst. of Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
    The cytochemical localisation of lignin and phenolics in P. tabacina-infected susceptible and resistant tobacco genotypes was investigated. The work was carried out with seedlings grown according to the cotyledon test as a model system. It involved a Knop ...
  4. Ann. Tabac, 1997, Sect. 2-29, p. 54-9., ISSN.0399-0354

    Induction of acidic pathogenesis-related (PR-1) proteins in Erysiphe cichoracearum D.C.-infected tobacco leaves

    EDREVA A.; COUSSIRAT J.C.; DELON R.
    D. Kostov Inst. of Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
    It is demonstrated that in N. tabacum leaves acidic pathogenesis-related (PR-1) proteins are induced by the obligatory ectoparasitic fungus Erysiphe cichoracearum, causative agent of tobacco powdery mildew. No difference was shown between the responses of ...
  5. CORESTA Meeting, Agronomy/Phytopathology, Montreux, 1997, PT9

    Variability of Peronospora tabacina: an isoenzyme study

    EDREVA A.; DELON R.; COUSSIRAT J.C.
    (1) D. Kostov Inst. of Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria. (2) SEITA, lnstitut du Tabac, Bergerac, France
    The variability of P. tabacina A. populations was studied using the isoenzyme polymorphism of peroxidase, malate dehydrogenase and superoxidismutase. P. tabacina conidia from N. tabacum crops cultivated in distant areas of Europe (France-Bulgaria) were ...
  6. Bull. Spec. CORESTA Congress, Jerez de la Frontera, 1992, p. 58, AP12, ISSN.0525-6240

    Blue mold of tobacco : Biochemical and molecular mechanisms

    EDREVA A.; GEORGIEVA I.D.; COUSSIRAT J.C.; DELON R.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    Biochemical and molecular mechanisms underlying the pathogenesis of blue mold in tobacco are investigated. Profound shifts in the metabolism of diseased plant are established, related to enzymes with oxidative, hydrolytic and phenol synthesizing functions ...
  7. Bull. Spec. CORESTA Symposium, Kallithea, 1990, p. 168, P11, ISSN.0525-6240

    Involvement of free radicals and superoxide dismutase in the blue mold resistance of tobacco

    EDREVA A.; KARJIEVA R.; COUSSIRAT J.C.; DELON R.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    The concentratio of free unpaired electrons (corresponding to the free radicals level) was investigated in tobacco seedlings during blue mold pathogenesis. The method of electron paramagnetic (spin) resonance was applied. The activity of the superoxide ...
  8. Ann. Tabac, 1987, Sect. 2, num. spéc., p. 93-104., ISSN.0399-0354

    A biochemical study of tobacco subjected to "cotyledon-test" : effect of magnesium, reactions of resistant and non resistant plants to Peronospora tabacina. IV - A biochemical and cytochemical study of the beta-glucosidase

    EDREVA A.; GEORGIEVA J.D.; COUSSIRAT J.C.
    Institut of Genetics - Sofia, Bulgaria
    The beta-glucosidase (E.C. 3.2.1.20) activity of tobacco cotyledons infected with P. tabacina was investigated using chemical and cytochemical methods in the early phases of the disease before the appearance of symptoms. It was shown that the beta ...