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Caterpillar Labial Saliva Alters Tomato Plant Gene Expression

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Abstract

We examined the effects of Helicoverpa zea caterpillar labial saliva on tomato plant gene expression. Caterpillars with labial salivary glands (mock-ablated) and without (ablated) were fed on tomato plants for 24 hr; then, the leaf mRNA was analyzed with tomato microarrays. Analysis of the transcript profiles revealed 384 expressed sequence tags (ESTs) that were significantly altered due to herbivory compared to the non-wounded plants. The majority of the ESTs were quantitatively altered more so by mock-ablated caterpillars with labial salivary glands than ablated caterpillars. Particularly notable, ESTs encoding acid phosphatase, arginase, acidic endochitinase, dehydrin, polyphenol oxidase, protease inhibitors, and threonine deaminase were more highly stimulated by mock-ablated caterpillars than ablated caterpillars. In addition, tomato leaves were mechanically wounded with scissors and painted with labial salivary gland extract, autoclaved salivary gland extract, or water, and compared to non-wounded tomato plants. After 4 hr, these leaves were collected and a tomato microarray analysis of the mRNA revealed correlation of the gene expression of these leaves altered by mechanical wounding and painted with salivary gland extract to the gene expression of leaves fed on by mock-ablated caterpillars. We show that caterpillar labial saliva is an important component of herbivory that can alter plant gene expression.

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Acknowledgements

Funding was provided by the National Science Foundation Plant Genome Research Initiative (No. 0820367 to ROM and SMH), the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service (No. 2004–01540 to ROM and SMH) and the Western Illinois University research council. We thank Drs. Amy Patrick Mossman (WIU), Patrick Dowd (USDA-ARS, Peoria), and Eric T. Johnson (USDA-ARS, Peoria) for their review of this manuscript. We also thank the Genome Consortium for Active Teaching for assistance in obtaining microarray chips used by undergraduate students in this project.

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  1. Department of Biological Sciences, Western Illinois University, Macomb, IL, 61455, USA

    Richard O. Musser, Sue M. Hum-Musser, Henry K. Lee, Brittany L. DesRochers & Spencer A. Williams

  2. Department of Entomology, Max Planck Institute for Chemical Ecology, Beutenberg Campus, Jena, 07745, Germany

    Heiko Vogel

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  1. Richard O. Musser
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Musser, R.O., Hum-Musser, S.M., Lee, H.K. et al. Caterpillar Labial Saliva Alters Tomato Plant Gene Expression. J Chem Ecol 38, 1387–1401 (2012). https://doi.org/10.1007/s10886-012-0198-3

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