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CONSTANS and jasmonate signaling coordinate floral senescence in Arabidopsis

ABSTRACT: Photoperiodic floral initiation in the leaf is controlled by the hub gene CONSTANS (CO) while jasmonates (JAs) control flower senescence. Although both processes are chronologically ordered, no association between them has been described to date. We show that CO protein remains in Arabidopsis flowers after the floral induction, although displaying a different tissue and diurnal pattern than in leaves. We found that changes in CO expression alter flower senescence and abscission by interfering with the JA response, supported by petal specific analysis as well as CO overexpression in JA synthesis and signaling mutants. CO has a ZIM-like domain that mediates interaction with the JA response repressor JAZ3 (jasmonate ZIM-domain 3), inhibiting its repressor activity and activating downstream transcription factors involved in flower senescence. The complex CO-JAZ3 also interacts with the E3 ubiquitin ligase Coronatine Insensitive 1 (COI1) leading to its degradation in the presence of jasmonates. Therefore, the coordinated recruitment of photoperiodic and jasmonate signaling pathways would be an efficient way for plants to chronologically order the floral process and ensure the success of offspring production.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE204774 | GEO | 2022/09/26

REPOSITORIES: GEO

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Project description:In the absence of adaptive immunity displayed by animals, plants respond locally to biotic challenge via inducible basal defense networks activated through recognition and response toconserved pathogen associated molecular patterns (PAMPs). In addition, immunity can be induced in tissues remote from infection sites via systemic acquired resistance (SAR), initiated following gene-for-gene recognition between plant resistance proteins and microbial effectors.The nature of the mobile signal and remotely activated networks responsible for establishing SAR remain unclear. Here we show that despite the absence of PAMP contact, systemically responding leaves rapidly activate a SAR transcriptional signature with strong similarity to local basal defense. Jasmonates have previously been implicated in systemic signalling in response to wounding and plant herbivory but not SAR. We present several lines of evidence that suggest jasmonates may also be central to SAR. Jasmonic acid (JA) rapidly accumulates in phloem exudates of leaves challenged with an avirulent strain of Pseudomonas syringae. In systemically responding leaves transcripts associated with jasmonate biosynthesis are upregulated and JA increases transiently. SAR can be mimicked by foliar JA application and is abrogated in mutants impaired in jasmonate synthesis or response. We conclude that, jasmonate signalling appears to mediate long-distance information transmission. Moreover, the systemic transcriptional response shares extraordinary overlap with local herbivory and wounding responses, indicating that jasmonates may be central to an evolutionarily conserved signalling network, which decodes multiple abiotic and biotic stress signals. Experimenter name: William Truman; Experimenter phone: +44 (0)1392 263789; Experimenter fax: +44 (0)1392 263434; Experimenter address: School of Biosciences; Experimenter address: Geoffrey Pope Building; Experimenter address: Stocker Road; Experimenter address: Exeter; Experimenter address: Devon; Experimenter zip/postal_code: EX4 4QD; Experimenter country: UK Experiment Overall Design: 9 samples were used in this experiment

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CONSTANS and jasmonate signaling coordinate floral senescence in Arabidopsis

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