silencing COI1 in rice increases susceptibility to chewing insects and impairs inducible defense.

PloS One
Mao YeRen Sen Zeng

Abstract

The jasmonic acid (JA) pathway plays a key role in plant defense responses against herbivorous insects. CORONATINE INSENSITIVE1 (COI1) is an F-box protein essential for all jasmonate responses. However, the precise defense function of COI1 in monocotyledonous plants, especially in rice (Oryza sativa L.) is largely unknown. We silenced OsCOI1 in rice plants via RNA interference (RNAi) to determine the role of OsCOI1 in rice defense against rice leaf folder (LF) Cnaphalocrocis medinalis, a chewing insect, and brown planthopper (BPH) Nilaparvata lugens, a phloem-feeding insect. In wild-type rice plants (WT), the transcripts of OsCOI1 were strongly and continuously up-regulated by LF infestation and methyl jasmonate (MeJA) treatment, but not by BPH infestation. The abundance of trypsin protease inhibitor (TrypPI), and the enzymatic activities of polyphenol oxidase (PPO) and peroxidase (POD) were enhanced in response to both LF and BPH infestation, but the activity of lipoxygenase (LOX) was only induced by LF. The RNAi lines with repressed expression of OsCOI1 showed reduced resistance against LF, but no change against BPH. Silencing OsCOI1 did not alter LF-induced LOX activity and JA content, but it led to a reduction in the TrypPI...Continue Reading

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Citations

Jun 29, 2014·Journal of Chemical Ecology·Marcelo L CamposGregg A Howe
Jul 30, 2014·Current Opinion in Plant Biology·Susheng SongDaoxin Xie
Sep 5, 2013·Proceedings of the National Academy of Sciences of the United States of America·Mao YeRensen Zeng
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Aug 17, 2021·The Plant Journal : for Cell and Molecular Biology·Susheng SongTiancong Qi

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Datasets Mentioned

BETA
AY168645

Methods Mentioned

BETA
PCR
transgenic
phosphotransferase
Fluorescence
electrophoresis

Software Mentioned

SPSS
Primer

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