| Title: | Insect herbivory antagonizes leaf cooling responses to elevated temperature in tomato |
| Author(s): | Havko NE; Das MR; McClain AM; Kapali G; Sharkey TD; Howe GA; |
| Address: | "Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824. Plant Resilience Institute, Michigan State University, East Lansing, MI 48824. Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824. Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824; howeg@msu.edu" |
| ISSN/ISBN: | 1091-6490 (Electronic) 0027-8424 (Print) 0027-8424 (Linking) |
| Abstract: | "As global climate change brings elevated average temperatures and more frequent and extreme weather events, pressure from biotic stresses will become increasingly compounded by harsh abiotic stress conditions. The plant hormone jasmonate (JA) promotes resilience to many environmental stresses, including attack by arthropod herbivores whose feeding activity is often stimulated by rising temperatures. How wound-induced JA signaling affects plant adaptive responses to elevated temperature (ET), however, remains largely unknown. In this study, we used the commercially important crop plant Solanum lycopersicum (cultivated tomato) to investigate the interaction between simulated heat waves and wound-inducible JA responses. We provide evidence that the heat shock protein HSP90 enhances wound responses at ET by increasing the accumulation of the JA receptor, COI1. Wound-induced JA responses directly interfered with short-term adaptation to ET by blocking leaf hyponasty and evaporative cooling. Specifically, leaf damage inflicted by insect herbivory or mechanical wounding at ET resulted in COI1-dependent stomatal closure, leading to increased leaf temperature, lower photosynthetic carbon assimilation rate, and growth inhibition. Pharmacological inhibition of HSP90 reversed these effects to recapitulate the phenotype of a JA-insensitive mutant lacking the COI1 receptor. As climate change is predicted to compound biotic stress with larger and more voracious arthropod pest populations, our results suggest that antagonistic responses resulting from a combination of insect herbivory and moderate heat stress may exacerbate crop losses" |
| Keywords: | Animals Climate Change Cyclopentanes/metabolism Feeding Behavior HSP90 Heat-Shock Proteins/genetics/metabolism Herbivory/physiology Hot Temperature Insecta/*physiology Solanum lycopersicum/*chemistry/genetics/metabolism/parasitology Oxylipins/metabolism P; |
| Notes: | "MedlineHavko, Nathan E Das, Michael R McClain, Alan M Kapali, George Sharkey, Thomas D Howe, Gregg A eng T32 GM110523/GM/NIGMS NIH HHS/ Research Support, N.I.H., Extramural Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. 2020/01/23 Proc Natl Acad Sci U S A. 2020 Jan 28; 117(4):2211-2217. doi: 10.1073/pnas.1913885117. Epub 2020 Jan 21" |
