Silicon Supplementation Alters the Composition of Herbivore Induced Plant Volatiles and Enhances Attraction of Parasitoids to Infested Rice Plants

Frontiers in Plant Science

卷:8

Rensen Zeng¹  Liwei Han²  Jinhong Wu²  Jiwei Zhu²  Yue Shao²  Minsheng You²  Jian Liu³  Geoff M. Gurr³  Olivia L. Reynolds⁴  Pengjun Zhang⁷ 

[1] College of Crop Science, Fujian Agriculture and Forestry UniversityFuzhou, China;

[2] Fujian-Taiwan Joint Innovation Centre for Ecological Control of Crop Pests, Fujian Agriculture and Forestry UniversityFuzhou, China;

[3] Graham Centre for Agricultural Innovation, Charles Sturt University, OrangeNSW, Australia;

[4] Graham Centre for Agricultural Innovation, New South Wales Department of Primary Industries, MenangleNSW, Australia;

[5] Institute of Applied Ecology, Fujian Agriculture and Forestry UniversityFuzhou, China;

[6] State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Fujian Agriculture and Forestry UniversityFuzhou, China;

[7] Zhejiang Provincial Key Laboratory of Biometrology and Inspection and Quarantine, China Jiliang UniversityHangzhou, China;

关键词: HIPV;    induced plant defense;    biological control;    jasmonate;    hexanal 2-ethyl;    α-bergamotene;   

DOI  :  10.3389/fpls.2017.01265

来源: DOAJ

【 摘 要 】

Silicon (Si) is important in plant defenses that operate in a direct manner against herbivores, and work in rice (Oryza sativa) has established that this is mediated by the jasmonate signaling pathway. Plant defenses also operate indirectly, by the production of herbivore induced plant volatiles (HIPVs) that attract predators and parasitoids of herbivores. These indirect defenses too are mediated by the jasmonate pathway but no earlier work has demonstrated an effect of Si on HIPVs. In this study, we tested the effect of Si supplementation versus Si deprivation to rice plants on subsequent HIPV production following feeding by the important pest, rice leaffolder (Cnaphalocrocis medinalis). Gas chromatography–mass spectrometry analyses showed lower production of α-bergamotene, β-sesquiohellandrene, hexanal 2-ethyl, and cedrol from +Si herbivore-infested plants compared with -Si infested plants. These changes in plant chemistry were ecologically significant in altering the extent to which parasitoids were attracted to infested plants. Adult females of Trathala flavo-orbitalis and Microplitis mediator both exhibited greater attraction to the HIPV blend of +Si plants infested with their respective insect hosts compared to -Si infested plants. In equivalent studies using RNAi rice plants in which jasmonate perception was silenced there was no equivalent change to the HIPV blend associated with Si treatment; indicating that the effects of Si on HIPVs are modulated by the jasmonate pathway. Further, this work demonstrates that silicon alters the HIPV blend of herbivore-infested rice plants. The significance of this finding is that there are no earlier-published studies of this phenomenon in rice or any other plant species. Si treatment to crops offers scope for enhancing induced, indirect defenses and associated biological control of pests because parasitoids are more strongly attracted by the HIPVs produced by +Si plants.

【 授权许可】

Unknown