Defensive Role of Tomato Polyphenol Oxidases against Cotton Bollworm (<Emphasis Type="Italic">Helicoverpa armigera</Emphasis>) and Beet Armyworm (<Emphasis Type="Italic">Spodoptera exigua</Emphasis>) |
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Authors: | Anongnut Bhonwong Michael J Stout Jutharat Attajarusit Piyada Tantasawat |
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Affiliation: | (1) School of Crop Production Technology, Institute of Agricultural Technology, Suranaree University of Technology, 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand;(2) Department of Entomology, Louisiana State University, 402 Life Sciences building, Baton Rouge, LA 70803, USA |
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Abstract: | Tomato (Solanum lycopersicum) polyphenol oxidases (PPOs), enzymes that oxidize phenolics to quinones, have been implicated in plant resistance to insects.
The role of PPO in resistance to cotton bollworm Helicoverpa armigera (Hübner)] and beet armyworm Spodoptera exigua (Hübner)] (Lepidoptera: Noctuidae) was evaluated. Consumption, weight gains, and mortality of larvae feeding on foliage of
transgenic tomato lines overexpressing PPO (OP lines) and of larvae feeding on foliage of transgenic tomato lines with suppressed
PPO (SP lines) were compared with consumption, weight gains, and mortality of larvae feeding on non-transformed (NT) plants.
Increases in foliage consumption and weight gains were observed for cotton bollworms feeding on leaves of SP plants compared
to NT and OP plants. PPO activity was negatively correlated with both weight gains and foliar consumption of cotton bollworm,
substantiating the defensive role of PPO against this insect. Similarly, beet armyworm consumed less foliage (both young and
old leaves) from OP plants than SP plants. Larvae feeding on OP leaves generally exhibited lower weight gains than those feeding
on SP leaves. These results indicate that tomato PPO plays a role in resistance to both cotton bollworm and beet armyworm. |
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Keywords: | Polyphenol oxidase PPO Tomato Solanum lycopersicum Cotton bollworm Helicoverpa armigera Beet armyworm Spodoptera exigua Insect resistance |
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