Search Results

66 results

  1. 48th TWC, Tob. Work. Conf., 2018, abstr. 41

    Search for varieties with useful resistance to Black Shank under Georgia growing conditions

    SHEALEY J.(1); DAWSON J.(1); TAYLOR J.(1); BEASLEY E.(1); BARNES T.(1); ANDERSON H.H.(1); VON WALDNER D.M.(1); MOORE J.M.(1); BERTRAND P.F.(1); LEWIS R.S.(2)
    (1) University of Georgia, Statenville GA USA; (2) North Carolina State University, Raleigh NC USA
    As new varieties of black shank resistant tobacco are brought to the market extension agents in Georgia annually conduct variety trials across the state to measure performance and Florida 301 resistance levels throughout our tobacco producing region. It ...
  2. CORESTA Congress, Kunming, 2018, Agronomy/Phytopathology Groups (Workshop), APW 06

    Modification of tobacco chemical constituents by molecular breeding

    LEWIS R.S.; DEWEY R.E.
    North Carolina State University, Department of Crop & Soil Sciences, Raleigh, NC, U.S.A.
    Tobacco plant chemistry affects consumer perception of derived products and also the potential for health risks associated with their use. Some cured leaf chemical components contribute positively to taste and aroma, while others have negative impacts and ...
  3. CORESTA Congress, Kunming, 2018, Agronomy/Phytopathology Groups, AP 23

    Engineering tobacco plants to degrade the potential NNK precursor pseudooxynicotine

    DEWEY R.E.; LEWIS R.S.; SELOTE D.
    North Carolina State University, Dept. of Crop and Soil Sciences, Raleigh, NC, U.S.A.
    Tobacco-specific nitrosamines (TSNAs) form when nitrous oxide species react with tobacco alkaloids. Although most published literature simplistically credits nicotine as being the alkaloid precursor for the potent TSNA NNK [4-(methyl nitrosoamino)-1-(3 ...
  4. CORESTA Congress, Kunming, 2018, Agronomy/Phytopathology Groups, AP 24

    Downregulation of a putative nitrate transporter gene substantially reduces the accumulation of TSNAs in air-cured tobaccos

    GOEPFERT S.(1); BOVET L.(1); LU J.(2); CAMPANONI P.(1); LEWIS R.S.(2); DEWEY R.E.(2)
    (1) Philip Morris Products S.A. (part of Philip Morris International group of companies), PMI R&D, Neuchâtel, Switzerland; (2) North Carolina State University, Department of Crop Science, Raleigh, NC, U.S.A.
    Air-cured Burley tobacco leaves typically exhibit high levels of nicotine-derived nitrosamine ketone (NNK) and N'-nitrosonornicotine (NNN). It has been previously demonstrated that leaf nitrate accumulation in air-cured tobaccos serves as the source ...
  5. CORESTA Meeting, Agronomy/Phytopathology, 2017, Santa Cruz do Sul, AP 28

    Identification of the genes underlying the yellow Burley phenotype in Nicotiana tabacum

    LEWIS R.S.(1); DRAKE-STOWE K.(1); HUMPHRY M.E.(2); EDWARDS K.D.(2); KERNODLE S.P.(1)
    (1) North Carolina State University, Crop Science Department, Raleigh, NC, U.S.A.; (2) British American Tobacco Company, Cambridge, U.K.
    The primary distinguishing characteristic of cultivars of the Burley tobacco market class is their high degree of chlorophyll deficiency, particularly on stems, stalks, and midveins, which becomes accentuated during plant maturation. This ‘yellow Burley’ ...
  6. TSRC, Tob. Sci. Res. Conf., 2017, 71, abstr. 070

    Genetic approaches and resources for enabling compliance to proposed NNN standards

    DEWEY R.E.(1); LEWIS R.S.(1); LU Jianli(1); BOVET L.(2); GOEPFERT S.(2); CAMPANONI P.(2)
    (1) North Carolina State University, Raleigh, NC, USA; (2) Philip Morris International, Neuchatel, Switzerland
    Tobacco-specific nitrosamines (TSNAs) are formed through the nitrosation of tobacco alkaloids. Over the past decade, we have demonstrated how altering the genetics of the tobacco plant can result in dramatic reductions in TSNA formation. This has been ...
  7. 47th TWC, Tob. Work. Conf., 2016, abstr. 29

    Working towards an increased understanding of the genetics of soil-borne disease resistance in tobacco

    DRAKE K.(1); LEWIS R.S.(1); BAKAHER N.(2); GOEPFERT S.(2); PHILIPPON B.(2); MARK R.(2); PETERSON P.D.(3)
    (1) North Carolina State University, Raleigh NC USA; (2) Philip Morris International, Neuchatel, Switzerland; (3) Clemson University, Florence SC USA
    Black shank and bacterial wilt, caused by Phytophthora nicotianae and Ralstonia solanacearum, respectively, are the most important diseases affecting tobacco production in the United States. An increased understanding of the genetic systems controlling ...