Search Results

11 results

  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. 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...
  6. Ann. Tabac, 1989, Sect. 2-22, p. 95-101., 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. VII. A cytochemical study of the callose deposition

    GEORGIEVA I.D.; DELON R.; COUSSIRAT J.C.
    Institut of Genetics - Sofia, Bulgaria
    The callose deposition on the cell walls of one susceptible and two resistant tobacco varieties, infected with P. tabacina Adam was investigated using the fluorescent technique. It was established that the callose papillae didn't appear in the...
  7. Bull. Spec. CORESTA Symposium, Kallithea, 1990, p. 141, A32, ISSN.0525-6240

    Study of cytoplasmic sterile male hybrids (CMS)-cytoplasm derived from Nicotiana goodspeedii

    PALAKARTCHEVA M.; YANTCHEVA A.; DELON R.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria; Institut de Tabac de Bergerac, France
    The aim of our research was the creation of cytoplasmic male hybrids (cytoplasm derived from N. goodspeedii. Sterile male lines with) sterile male cytoplasm from N. goodspeedii were used on the one hand on the other, the French varieties BB30 and...
  8. 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...
  9. Bull. Spec. CORESTA Symposium, Kallithea, 1990, p. 183, PP01, ISSN.0525-6240

    Biochemical study of tobacco tested under"test-cotyledon"conditions : Effects of magnesium, reactions of plants resistant and sensitive to Peronospora tabacina. Cytochemical study of Callose

    GEORGIEVA I.D.; DELON R.; COUSSIRAT J.C.; EDREVA A.M.
    Institute of Genetics, Sofia, Bulgaria; Institut Expérimental du Tabac, Bergerac, France
    Tobacco obtained under cotyledon test conditions was inoculated with P. tabacina Adam conidia. The presence of callose deposits was detected in the cell walls of three genotypes. In the sensitive type, there was no formation of callose papillae in...