| Title: | Elevated carbon dioxide reduces emission of herbivore-induced volatiles in Zea mays |
| Author(s): | Block A; Vaughan MM; Christensen SA; Alborn HT; Tumlinson JH; |
| Address: | "Center for Medical, Agricultural and Veterinary Entomology, U.S. Department of Agriculture - Agricultural Research Service, Gainesville, FL, 32608, USA. National Center for Agricultural Utilization Research, U.S. Department of Agriculture - Agricultural Research Service, Peoria, IL, 61604, USA. Center for Chemical Ecology, Penn State University, University Park, PA, 16802, USA" |
| ISSN/ISBN: | 1365-3040 (Electronic) 0140-7791 (Linking) |
| Abstract: | "Terpene volatiles produced by sweet corn (Zea mays) upon infestation with pests such as beet armyworm (Spodoptera exigua) function as part of an indirect defence mechanism by attracting parasitoid wasps; yet little is known about the impact of climate change on this form of plant defence. To investigate how a central component of climate change affects indirect defence, we measured herbivore-induced volatile emissions in plants grown under elevated carbon dioxide (CO(2) ). We found that S. exigua infested or elicitor-treated Z. mays grown at elevated CO(2) had decreased emission of its major sesquiterpene, (E)-beta-caryophyllene and two homoterpenes, (3E)-4,8-dimethyl-1,3,7-nonatriene and (3E,7E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene. In contrast, inside the leaves, elicitor-induced (E)-beta-caryophyllene hyper-accumulated at elevated CO(2) , while levels of homoterpenes were unaffected. Furthermore, gene expression analysis revealed that the induction of terpene synthase genes following treatment was lower in plants grown at elevated CO(2) . Our data indicate that elevated CO(2) leads both to a repression of volatile synthesis at the transcriptional level and to limitation of volatile release through effects of CO(2) on stomatal conductance. These findings suggest that elevated CO(2) may alter the ability of Z. mays to utilize volatile terpenes to mediate indirect defenses" |
| Keywords: | "Alkyl and Aryl Transferases/genetics Animals Carbon Dioxide/*pharmacology Cyclopentanes/metabolism Diet Gene Expression Regulation, Plant/drug effects Genes, Plant Herbivory/*physiology Larva/growth & development Oxylipins/metabolism Plant Leaves/drug eff;" |
| Notes: | "MedlineBlock, Anna Vaughan, Martha M Christensen, Shawn A Alborn, Hans T Tumlinson, James H eng 2017/04/25 Plant Cell Environ. 2017 Sep; 40(9):1725-1734. doi: 10.1111/pce.12976. Epub 2017 Jun 23" |
