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Open AccessArticle

Polyphenol-Rich Purple Corn Pericarp Extract Adversely Impacts Herbivore Growth and Development

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Department of Biology, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
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School of Earth, Environmental, and Marine Sciences, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
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Mathematics and Science Academy, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
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Department of Chemistry, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
*
Author to whom correspondence should be addressed.
Insects 2020, 11(2), 98; https://doi.org/10.3390/insects11020098
Received: 12 January 2020 / Revised: 28 January 2020 / Accepted: 30 January 2020 / Published: 2 February 2020
Plant secondary metabolites such as terpenes, phenolics, glycosides, and alkaloids play various functional roles including pigmentation, foliar and floral volatile synthesis, hormonal regulation, and direct and indirect defenses. Among these, phenolic compounds are commonly found in plants, but vary in the distribution of their specific compounds among plant families. Polyphenols, including anthocyanins and tannins, are widely distributed and have been well documented for their roles- primarily in plant pigmentation and also in plant defenses. However, commercialization of such compounds for use in insect pest management is severely hampered by expensive, inefficient, and time-consuming extraction protocols. Using a recently developed inexpensive and easy extraction method using the byproducts of pigmented (purple) corn processing, we examined whether the crude pericarp extract rich in polyphenols can affect the growth and development of tobacco hornworm (Manduca sexta L.) caterpillars. Our findings show that purple corn pericarp extract negatively affected M. sexta egg hatching and larval mass gain and prolonged developmental time compared to regular yellow corn extract or an artificial control diet. We also found that these effects were more severe during the early stages of caterpillar development. These results conclusively demonstrate that purple corn pericarp, an inexpensive by-product of the corn milling industry, is a valuable product with excellent potential as an insect antifeedant. View Full-Text
Keywords: purple corn; polyphenols; tobacco hornworm; hatching rate; mass gain; pupation purple corn; polyphenols; tobacco hornworm; hatching rate; mass gain; pupation
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MDPI and ACS Style

Tayal, M.; Somavat, P.; Rodriguez, I.; Thomas, T.; Christoffersen, B.; Kariyat, R. Polyphenol-Rich Purple Corn Pericarp Extract Adversely Impacts Herbivore Growth and Development. Insects 2020, 11, 98.

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