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Nicotiana attenuata MPK4 suppresses a novel jasmonic acid (JA) signaling-independent defense pathway against the specialist insect Manduca sexta, but is not required for the resistance to the generalist Spodoptera littoralis
Hettenhausen, Christian ; Baldwin, Ian T. ; Wu, Jianqiang
Corresponding AuthorWu, JQ (reprint author), Chinese Acad Sci, Kunming Inst Bot, Kunming 650201, Peoples R China. ; jwu@ice.mpg.de
2013
Source PublicationNEW PHYTOLOGIST
ISSN0028-646X
Volume199Issue:3Pages:787-799
AbstractHow plants tailor their defense responses to attack from different insects remains largely unknown. Here, we studied the role of a mitogen-activated protein kinase (MAPK), MPK4, in the resistance of a wild tobacco Nicotiana attenuata to two herbivores, the specialist Manduca sexta and the generalist Spodoptera littoralis. Stably transformed N. attenuata plants silenced in MPK4 (irMPK4) were generated and characterized for traits important for defense against herbivores. Only the oral secretions (OS) from M. sexta, but not the OS from S. littoralis or mechanical wounding, induced elevated levels of jasmonic acid (JA) in irMPK4 plants relative to the wildtype plants. Moreover, silencing of MPK4 strongly increased the resistance of N. attenuata to M. sexta in a fashion that was independent of COI1 (CORONATINE INSENSITIVE1)-mediated JA signaling. Untargeted metabolomic screening identified several new MPK4-dependent putative defensive compounds against M. sexta. By contrast, silencing of MPK4 did not affect the growth of the generalist insect S. littoralis, and we propose that this was because of the very low levels of fatty acid-amino acid conjugates (FACs) in S. littoralis OS. Thus, MPK4 is likely to be a key signaling element that enables plants to tailor defense responses to different attackers.
KeywordActivated Protein-kinases Molecular-interactions Arabidopsis-thaliana Microarray Analysis Salicylic-acid Cross-talk Diterpene Glycosides Disease Resistance Plant-responses Gene-expression Defense Generalist Insect Herbivore Mitogen-activated Protein Kinase Nicotiana Attenuata Specialist Insect
Subject AreaPlant Sciences
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/16835
Collection资源植物与生物技术所级重点实验室
Recommended Citation
GB/T 7714
Hettenhausen, Christian,Baldwin, Ian T.,Wu, Jianqiang. Nicotiana attenuata MPK4 suppresses a novel jasmonic acid (JA) signaling-independent defense pathway against the specialist insect Manduca sexta, but is not required for the resistance to the generalist Spodoptera littoralis[J]. NEW PHYTOLOGIST,2013,199(3):787-799.
APA Hettenhausen, Christian,Baldwin, Ian T.,&Wu, Jianqiang.(2013).Nicotiana attenuata MPK4 suppresses a novel jasmonic acid (JA) signaling-independent defense pathway against the specialist insect Manduca sexta, but is not required for the resistance to the generalist Spodoptera littoralis.NEW PHYTOLOGIST,199(3),787-799.
MLA Hettenhausen, Christian,et al."Nicotiana attenuata MPK4 suppresses a novel jasmonic acid (JA) signaling-independent defense pathway against the specialist insect Manduca sexta, but is not required for the resistance to the generalist Spodoptera littoralis".NEW PHYTOLOGIST 199.3(2013):787-799.
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