Cuticular Leaf Chemistry and Insect Resistance of Three Reciprocally Grafted Tobacco Types

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Cuticular components of green tobacco, Nicotiana tabacum L., leaves affect insect–plant relationships associated with host-plant resistance. Formation and composition of these chemicals was investigated using intact and reciprocally grafted tobacco plants. Reciprocal grafts were made between scions and rootstocks of 'NC 2326,' flue-cured tobacco, and two insect-resistant tobacco introductions, TI 165, and TI 1112. Field resistance to green peach aphids, Myzus persicae (Sulzer), tobacco budworms, Heliothis virescens (F.), and tobacco hornworms, Manduca sexta (L.), was retained by TI 1112 and TI 165 scions regardless of rootstock. Tobacco budworm larval survival and weight gain was highest on all NC 2326 scions. Budworm moths laid few eggs on ungrafted TI 1112, on TI 1112 scions grafted on NC 2326, or on TI 1112 grafted on its own rootstock. Levels of cuticular chemical components were similar among like scions. Thus, rootstock type apparently does not affect production of cuticular components nor insect resistance in TI 1112 and TI 165.

Document Type: Research Article

Publication date: August 1, 1985

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