| Title: | Plant volatiles guide the new pest Dichelops furcatus to feed on corn seedlings |
| Author(s): | Jacobi VG; Fernandez PC; Barriga LG; Almeida-Trapp M; Mithofer A; Zavala JA; |
| Address: | "Instituto de Investigaciones en Biociencias Agricolas y Ambientales-CONICET, Buenos Aires, Argentina. Universidad de Buenos Aires, Catedra de Genetica, Facultad de Agronomia, Buenos Aires, Argentina. Departamento de Biologia Aplicada y Alimentos, Universidad de Buenos Aires, Catedra de Quimica de Biomoleculas, Facultad de Agronomia, Buenos Aires, Argentina. Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR-CONICET), Buenos Aires, Argentina. Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET), Buenos Aires, Argentina. King Abdullah University of Science and Technology, Thuwal, Saudi Arabia. Max Planck Institute for Chemical Ecology, Research Group Plant Defense Physiology, Jena, Germany. Universidad de Buenos Aires, Catedra de Bioquimica, Facultad de Agronomia, Buenos Aires, Argentina" |
| ISSN/ISBN: | 1526-4998 (Electronic) 1526-498X (Linking) |
| Abstract: | "BACKGROUND: Recently, in temperate and neotropical regions of South America the generalist stink bug Dichelops furcatus (Hemiptera: Pentatomidae) became a new pest of corn (Zea mays) seedlings. Implementation of no-tillage cultivation system left organic matter covering the soil, which shelters adults of stink bugs during winter. In spring, corn is sowed under soybean stubble and D. furcatus adults start to feed on seedlings. To determine corn-derived volatile organic compounds (VOCs) that attract this stink bug species, we evaluated stink bug preferences from two corn hybrids with contrast germplasm backgrounds, a temperate and a tropical hybrid. RESULTS: Stink bugs preferred to feed on temperate seedlings rather than on the tropical ones. GC-MS and PCA analysis of VOCs suggested that hybrids emitted contrasting blends. Linalool represented 68% of total VOCs emitted from temperate corn, while in the tropical hybrid this compound represented 48%. Olfactometer experiments demonstrated that linalool was attractive to stink bugs. However, 2 h of D. furcatus attack induced emission of 14 additional VOCs in temperate seedlings, and olfactometer bioassay and blend of VOCs emission suggested that perceived volatiles by stink bugs induced feeding avoidance. The increment of VOCs emission was associated with the induction of JA, JA-Ile, ABA, and IAA, and decreasing of SA concentrations. CONCLUSION: This is the first time showing a complete profile of defensive phytohormones induced by stink bugs feeding on corn, and further demonstrating that a blend of corn seedling-associated VOCs, mainly composed by linalool, modulates D. furcatus adults' behavior and feeding preferences. (c) 2021 Society of Chemical Industry" |
| Keywords: | Animals *Heteroptera Seedlings Soybeans *Volatile Organic Compounds Zea mays Dichelops furcatus Phytohormone regulation corn seedlings linalool organic volatile compounds stink bugs; |
| Notes: | "MedlineJacobi, Vanesa Gisela Fernandez, Patricia Carina Barriga, Lucia Guadalupe Almeida-Trapp, Marilia Mithofer, Axel Zavala, Jorge Alberto eng Ministerio de Ciencia, Tecnologia e Innovacion Productiva/ Consejo Nacional de Investigaciones Cientificas y Tecnicas/ England 2021/01/13 Pest Manag Sci. 2021 May; 77(5):2444-2453. doi: 10.1002/ps.6273. Epub 2021 Jan 27" |
