Identification of an orthologous clade of peroxidases that respond to feeding by greenbugs (Schizaphis graminum) in C4 grasses
Erin D. Scully A , Teresa Donze-Reiner B , Haichuan Wang C , Thomas E. Eickhoff C D , Frederick Baxendale C , Paul Twigg E , Frank Kovacs F , Tiffany Heng-Moss C , Scott E. Sattler G and Gautam Sarath G H
+ Author Affiliations
- Author Affiliations
A Stored Product Insect and Engineering Research Unit, Center for Grain and Animal Health Research USDA-ARS, Manhattan, KS 66502, USA.
B Department of Biology, West Chester University, West Chester, PA 19382, USA.
C Department of Entomology, University of Nebraska-Lincoln, Lincoln, NE 68583, USA.
D Monsanto Company, 800 North Lindbergh Blvd, St Louis, MO 63167, USA.
E Department of Biology, University of Nebraska-Kearney, Kearney, NE 68849, USA.
F Department of Chemistry, University of Nebraska-Kearney, Kearney, NE 68849, USA.
G Grain, Forage and Bioenergy Research Unit, USDA-ARS, Lincoln, NE 68583, USA.
H Corresponding Author. Email: gautam.sarath@ars.usda.gov
Functional Plant Biology 43(12) 1134-1148 https://doi.org/10.1071/FP16104
Submitted: 17 March 2016 Accepted: 29 July 2016 Published: 26 August 2016
Abstract
Knowledge of specific peroxidases that respond to aphid herbivory is limited in C4 grasses, but could provide targets for improving defence against these pests. A sorghum (Sorghum bicolor (L.) Moench) peroxidase (SbPrx-1; Sobic.002G416700) has been previously linked to biotic stress responses, and was the starting point for this study. Genomic analyses indicated that SbPrx-1 was part of a clade of five closely related peroxidase genes occurring within a ~30 kb region on chromosome 2 of the sorghum genome. Comparison of this ~30-kb region to syntenic regions in switchgrass (Panicum virgatum L.) and foxtail millet (Setaria italica L.) identified similar related clusters of peroxidases. Infestation of a susceptible sorghum cultivar with greenbugs (Shizaphis graminum Rondani) induced three of the five peroxidases. Greenbug infestation of switchgrass and foxtail millet plants showed similar inductions of peroxidases. SbPrx-1 was also induced in response to aphid herbivory in a greenbug-resistant sorghum line, Cargill 607E. These data indicate that this genomic region of C4 grasses could be valuable as a marker to assess potential insect resistance in C4 grasses.
Additional keywords: defense, defence, foxtail millet, greenbugs, plant resistance, sorghum, switchgrass, synteny.
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