| Title: | Herbivore-induced and constitutive volatiles are controlled by different oxylipin-dependent mechanisms in rice |
| Author(s): | Mujiono K; Tohi T; Sobhy IS; Hojo Y; Shinya T; Galis I; |
| Address: | "Institute of Plant Science and Resources, Okayama University, Kurashiki, Japan. Faculty of Agriculture, Mulawarman University, Samarinda, Indonesia. Department of Plant Protection, Faculty of Agriculture, Suez Canal University, Ismailia, Egypt. School of Life Sciences, Huxley Building, Keele University, Keele, UK" |
| ISSN/ISBN: | 1365-3040 (Electronic) 0140-7791 (Linking) |
| Abstract: | "Despite the importance of volatile organic compounds (VOCs) for plants, control mechanisms for their basal and stress-induced biosynthesis and release remain unclear. We sampled and characterized headspace and internal leaf volatile pools in rice (Oryza sativa), after a simulated herbivory treatment, which triggers an endogenous jasmonate burst. Certain volatiles, such as linalool, were strongly upregulated by simulated herbivory stress. In contrast, other volatiles, such as beta-caryophyllene, were constitutively emitted and fluctuated according to time of day. Transcripts of the linalool synthase gene transiently increased 1-3 h after exposure of rice to simulated herbivory, whereas transcripts of caryophyllene synthase peaked independently at dawn. Unexpectedly, although emission and accumulation patterns of rice inducible and constitutive VOCs were substantially different, both groups of volatiles were compromised in jasmonate-deficient hebiba mutants, which lack the allene oxide cyclase (AOC) gene. This suggests that rice employs at least two distinct oxylipin-dependent mechanisms downstream of AOC to control production of constitutive and herbivore-induced volatiles. Levels of the JA precursor, 12-oxo-phytodienoic acid (OPDA), were correlated with constitutive volatile levels suggesting that OPDA or its derivatives could be involved in control of volatile emission in rice" |
| Keywords: | "Acyclic Monoterpenes/metabolism Animals Cyclopentanes/metabolism Fatty Acids, Unsaturated/metabolism Gene Expression Regulation, Plant *Herbivory Intramolecular Oxidoreductases/genetics Mutation Oryza/*physiology Oxylipins/*metabolism Plant Growth Regulat;" |
| Notes: | "MedlineMujiono, Kadis Tohi, Tilisa Sobhy, Islam S Hojo, Yuko Shinya, Tomonori Galis, Ivan eng Research Support, Non-U.S. Gov't 2021/06/12 Plant Cell Environ. 2021 Aug; 44(8):2687-2699. doi: 10.1111/pce.14126. Epub 2021 Jun 21" |
