Wednesday, 20 November 2002

This presentation is part of : Display Presentations, Subsection Fa. Host Plant Resistance

Molecular response of plants to herbivore salivary components

Richard Oliver Musser1, Matthew Gallucci, Sue Mei Hum-Musser1, Gary W. Felton2, and Judith K. Brown3. (1) University of Arizona, Center of Insect Science, Dept. of Plant Science, Tucson, AZ, (2) Pennsylvania State University, Department of Entomology, 501 ASI, university park, PA, (3) University of Arizona, Plant Sciences, College of Agriculture, Forbes Building, Tucson, AZ

This research examines plant gene expression resulting from herbivory by insects with different feeding modes on three economically important host plants—maize, tomato, and bean. I will focus on two generalist herbivores, H. zea (Corn earworm/Tomato fruitworm) and Bemisia tabaci (Sweetpotato whitefly) that feed on maize, tomato, and bean, and the specialist herbivores, Diatraea grandiosella, (Southwestern corn borer), Manduca spp. (Tobacco/Tomato hornworm), and E. varivestis (Mexican bean beetle) which feed on maize, tomato, and bean, respectively. The feeding behavior of these insect species differs in the amount and type of plant damage caused, and their salivary compounds differ as well. For example, chewing insects often cause gross damage to plant tissue and stimulate jasmonate-mediated wound signals. While piercing/sucking insects insert their stylets into the phloem tissue, stimulating the salicylic-acid mediated defense signals. We will describe cDNA microarrays (genetic response) experiments performed.

Species 1: Lepidoptera Noctuidae Helicoverpa zea (corn earworm)
Species 2: Homoptera Aleyrodidae Bemisia (whitefly)
Species 3: (maize, tomato)
Keywords: induced resistance, microarrays

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