| Title: | Contrasting effects of ethylene biosynthesis on induced plant resistance against a chewing and a piercing-sucking herbivore in rice |
| Author(s): | Lu J; Li J; Ju H; Liu X; Erb M; Wang X; Lou Y; |
| Address: | "State Key Laboratory of Rice Biology, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China. Institute of Plant Sciences, University of Bern, Altenbergrain 21, 3013 Bern, Switzerland. State Key Laboratory of Rice Biology, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China. Electronic address: yglou@zju.edu.cn" |
| ISSN/ISBN: | 1752-9867 (Electronic) 1674-2052 (Linking) |
| Abstract: | "Ethylene is a stress hormone with contrasting effects on herbivore resistance. However, it remains unknown whether these differences are plant- or herbivore-specific. We cloned a rice 1-aminocyclopropane-1-carboxylic acid (ACC) synthase gene, OsACS2, whose transcripts were rapidly up-regulated in response to mechanical wounding and infestation by two important pests: the striped stem borer (SSB) Chilo suppressalis and the brown planthopper (BPH) Nilaparvata lugens. Antisense expression of OsACS2 (as-acs) reduced elicited ethylene emission, SSB-elicited trypsin protease inhibitor (TrypPI) activity, SSB-induced volatile release, and SSB resistance. Exogenous application of ACC restored TrypPI activity and SSB resistance. In contrast to SSB, BPH infestation increased volatile emission in as-acs lines. Accordingly, BPH preferred to feed and oviposit on wild-type (WT) plants--an effect that could be attributed to two repellent volatiles, 2-heptanone and 2-heptanol, that were emitted in higher amounts by as-acs plants. BPH honeydew excretion was reduced and natural enemy attraction was enhanced in as-acs lines, resulting in higher overall resistance to BPH. These results demonstrate that ethylene signaling has contrasting, herbivore-specific effects on rice defense responses and resistance against a chewing and a piercing-sucking insect, and may mediate resistance trade-offs between herbivores of different feeding guilds in rice" |
| Keywords: | "Animals Ethylenes/*biosynthesis Gene Expression Regulation, Plant Hemiptera/*physiology *Herbivory Lyases/genetics/*metabolism Oryza/enzymology/genetics/*physiology Plant Proteins/genetics/*metabolism Plants, Genetically Modified OsACS2 direct defense eth;" |
| Notes: | "MedlineLu, Jing Li, Jiancai Ju, Hongping Liu, Xiaoli Erb, Matthias Wang, Xia Lou, Yonggen eng Research Support, Non-U.S. Gov't England 2014/07/30 Mol Plant. 2014 Nov; 7(11):1670-1682. doi: 10.1093/mp/ssu085. Epub 2014 Jul 26" |
