Jasmonates (JAs) are essential signalling molecules that co-ordinate the plant response to biotic and abiotic challenges, as well as co-ordinating several developmental processes. Huge progress has been made over the last decade in understanding the components and mechanisms that govern JA perception and signalling. The bioactive form of the hormone, (+)-7-iso-jasmonyl-l-isoleucine (JA-Ile), is perceived by the COI1–JAZ co-receptor complex. JASMONATE ZIM DOMAIN (JAZ) proteins also act as direct repressors of transcriptional activators such as MYC2. In the emerging picture of JA-Ile perception and signalling, COI1 operates as an E3 ubiquitin ligase that upon binding of JA-Ile targets JAZ repressors for degradation by the 26S proteasome, thereby derepressing transcription factors such as MYC2, which in turn activate JA-Ile-dependent transcriptional reprogramming. It is noteworthy that MYCs and different spliced variants of the JAZ proteins are involved in a negative regulatory feedback loop, which suggests a model that rapidly turns the transcriptional JA-Ile responses on and off and thereby avoids a detrimental overactivation of the pathway. This chapter highlights the most recent advances in our understanding of JA-Ile signalling, focusing on the latest repertoire of new targets of JAZ proteins to control different sets of JA-Ile-mediated responses, novel mechanisms of negative regulation of JA-Ile signalling, and hormonal cross-talk at the molecular level that ultimately determines plant adaptability and survival.
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September 2015
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September 15 2015
Novel players fine-tune plant trade-offs Available to Purchase
Selena Gimenez-Ibanez;
Selena Gimenez-Ibanez
Plant Molecular Genetics Department, Centro Nacional de Biotecnología-CSIC (CNB-CSIC), 28049, Madrid, Spain
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Marta Boter;
Marta Boter
Plant Molecular Genetics Department, Centro Nacional de Biotecnología-CSIC (CNB-CSIC), 28049, Madrid, Spain
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Roberto Solano
Roberto Solano
1
Plant Molecular Genetics Department, Centro Nacional de Biotecnología-CSIC (CNB-CSIC), 28049, Madrid, Spain
1To whom correspondence should be addressed (email [email protected]).
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Publisher: Portland Press Ltd
Online ISSN: 1744-1358
Print ISSN: 0071-1365
© 2015 Authors; published by Portland Press Limited
2015
Essays Biochem (2015) 58: 83–100.
Citation
Thomas Guilfoyle, Gretchen Hagen, Selena Gimenez-Ibanez, Marta Boter, Roberto Solano; Novel players fine-tune plant trade-offs. Essays Biochem 15 September 2015; 58 83–100. doi: https://doi.org/10.1042/bse0580083
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