Cuticular components from Nicotiana

SEVERSON, R.F., ECKEL, R.V.W., JACKSON, D.M., SISSON, V.A., STEPHENSON, M.G., Aphicidal activity of cuticular components from Nicotiana tabacum, Nat. Engin. PestManag. Agents, 1994,551, 172-179. 

In this report, we will discuss investigations of the cuticular components from Nicotiana species and their effects on tobacco homworm and tobacco budworm moth oviposition. The response of tobacco budworm moths to specific cuticular isolates from a Nicotiana species also will be discussed. 

TABLE V. Ovipositional Response of Tobacco Budworm Moths to Cuticular Components from Nicotiana spp. Applied to Nonpreferred TI 1112 (Entry A) in Paired Choice Tests with TI 1112 Sprayed with Solvent Blank (Entry B). 

Severson RF, Jackson DM, Johnson AW, Sisson VA, Stephenson MG (1991) Ovipositional behaviour of tobacco budworm and tobacco hornworm. Effects of cuticular components from Nicotiana species. ACS Sympos Ser vol 449, American Chemical Society, Washington, DC, pp 264-277... 

Aphicidal Activity of Cuticular Components from Nicotiana tabacum... 

About six weeks after transplantation, cuticular components from field-grown plants of each Nicotiana species were extract by dipping young leaves in 8 oz. wide mouth bottles containing methylene chloride. After removal of the methylene chloride, the extract residue was treated with 1 1... 

Branched-chain alkanes are common in cuticular wax although much less widely distributed than n-alkanes. They comprise a major proportion (nearly 50%) of the alkane fraction from some Nicotiana and Geonium species. Generally, the iso- and anteiso-alkanes (cf Table 1) with odd and even numbers of carbon atoms, respectively, are the main examples although compounds with internal and/or multiple methyl branching and even cycloalkanes have been reported as minor components" " . iso-Alkanes with even-carbon numbers (e.g. C32 and C34 compounds) occur in wax from rose and lavender petals, respectively, and iso and anteiso homologues lower than the range listed in Table 4 (e.g. C21-C23 compounds) have been found in lilac blossom. ... 

Most Nicotiana species have multicellular, glanded leaf trichomes which may produce chemical secretions containing diterpenes and/or sugar esters with C2 to C,o acyl moieties. These components affect tobacco aphids, Myzus nicotianae Blackman, in several ways, including influencing the acceptance or rejection of plants for colonization by alate migrant aphids, and the survival and fecundity of alate and apterous aphids. Cuticular diterpenes and sucrose esters were isolated from the cuticular extracts of aphid resistant and susceptible N. tabacum genotypes. These compounds were applied topically to the backs of apterous aphids. 

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