1. Bull. Spec. CORESTA Congress, Brighton, 1998, p. 152, PPOST14

    Resistance of tobacco to tobacco aphids (Myzus nicotianae Blackman) originating from N. gossei

    DIMITROV B.; KRUSTEVA D.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    The tobacco aphids (Myzus nicotianae Blackman) are important pests of the tobacco crop in Bulgaria. Besides the reduction of tobacco yield and quality they transfer many virus diseases. The wild species N. gossei is used in tobacco immunobreeding as a ...
  2. 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 ...
  3. CORESTA Meeting, Agronomy/Phytopathology, Montreux,1997, PT13

    Morphological and cytological characteristics of somatic hybrids between N. tabacum and N. megalosiphon

    ILCHEVA V.; SAN L.H.; DORLHAC F.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    Somatic hybrid plants between N. tabacum (IVB (bar)) and N. megalosiphon (npt II) were recovered after polyethylene glycol (PEG)- mediated fusion and electrofusion. The hybrid calli were selected on plant regeneration medium on the basis of dual ...
  4. Tob. Sci., 1995, 39-1, p.18-22., ISSN.0082-4623

    In vitro selection of glyphosate-tolerant tobacco callus lines and expression of herbicide tolerance in regenerated plants

    NEDKOVSKA M .
    Bulgarian Acad. of Science, Inst. of Genetics, Dept. of Cell Genetics, Sofia, Bulgaria.
    The objectives of this study were the selection of glyphosate-tolerant callus cultures of important Bulgarian tobacco (Nicotiana tabacum L,) cultivars, regeneration of tolerant calli, confirmation of tolerance in regenerated plants, and field testing of ...
  5. Tob. Sci., 1995, 39-2, p. 38-42., ISSN.0082-4623

    Hybridization between Nicotiana gossei Domin and N. tabacum L. for development of Oriental tobacco lines resistant to tobacco aphids and diseases

    PALAKARCHEVA M.; STANEVA M.; TSANOVA E.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    The disease- and aphid-resistant species, N. gossei (2n=36), was crossed with N. tabacum cv. Kroumovgrad 90, an Oriental tobacco type. The F 1 hybrids from this cross were all sterile. Regenerates of this cross were developed by in vitro methods, and they ...
  6. Bull. Spec. CORESTA Congress, Harare 1994, p. 138, PPOST 11

    Overcoming the non-crossability between N. rustica var. Brasilia L. and N. tabacum - creation of wild fire resistant F1 hybrids

    KRUSTEVA D.
    D. Kostov Inst. of Genetics, Bulgarian Academy of Sciences, Sofia, Bulgaria
    The purpose of the present investigation is the overcoming of the non-crossability between species N. rustica var. Brasilia (2n = 48) and N. tabacum (2n = 48) to create of wild fire resistant tobacco hybrids and lines. The initial material used for ...
  7. Bull. Spec. CORESTA Congress, Harare 1994, p. 142, PPOST 15

    Investigation of cytoplasmic-nuclear interactions and manifestation of cytoplasmic male sterility in tobacco

    NIKOVA V.; VLADOVA R.; PANDEVA R.; SHABANOV D.; NIKOLOV E.; KANEVA S.
    Bulgarian Academy of Science, Institute of Genetics, Sofia, Bulgaria.
    Cytoplasmic male sterility (CMS) is defined as the inability to produce functional pollen with preservation of normal female fertility. CMS in tobacco is caused by a combined action of nuclear genes and extrachromosomal factors and is an useful tool for ...