Search Results

22 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. Beitr. Tabakforsch. Int./Contrib. Tob. Research, 2003, 20-5, p. 355-9., ISSN.0173-783X.

    Application of pattern recognition method for color assessment of oriental tobacco based on HPLC of polyphenols

    DAGNON S.; EDREVA A.
    Inst. for Tobacco and Tobacco Products, Plovdiv, Bulgaria
    The color of Oriental tobaccos was organoleptically assayed, and high performance liquid chromatography (HPLC) of polyphenols was performed. The major tobacco polyphenols (chlorogenic acid, its isomers, and rutin), as well as scopoletin and kaempferol-3 ...
  3. CORESTA Meeting, Agronomy/Phytopathology, Bucharest, 2003, AP 10

    Contribution of valeric acids to aroma characteristics of Oriental tobaccos

    DAGNON S.; TACHEVA R.; STOILOVA A.; EDREVA A.; CHRISTEVA D.
    Inst. for Tobacco and Tobacco Products, Plovdiv, Bulgaria
    Levels of free valeric acids (isovaleric and 3-methyl valeric) in leaves of different tobacco types were quantified by using CGC (capillary gas chromatography) equipped with flame ionization detector. Their content in tobacco smoke was also determined. ...
  4. 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, ...
  5. 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 ...
  6. 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 ...
  7. 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 ...