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An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [seq]

ABSTRACT: Algal discs were transferred to a 12-well plate containing 2 ml liquid 0.5 Gamborg’s B5 mock or OPDA 25 µM, incubated for 2 hours on a shaker (120 rpm) and then the algae were frozen in liquid nitrogen and ground to a fine powder.

ORGANISM(S): Klebsormidium nitens

PROVIDER: GSE141417 | GEO | 2020/03/04

REPOSITORIES: GEO

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An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance

Project description:This SuperSeries is composed of the SubSeries listed below.

2020-03-04 | GSE141430 | GEO

An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [array]

Project description:Seeds of the double mutant opr3-3 coi1-1 were germinated in Johnson media supplemented with 0.5 µM coronatine, to select homozygous coi1-1 plants, at 21°C under long-day conditions (16-h light/8-h dark)

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An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance

Project description:An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance

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An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [seq]

Project description:An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [seq]

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An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [array]

Project description:An Ancient COI1-independent Function for Reactive Electrophilic Oxylipins in Thermotolerance [array]

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Transcription profiling of Arabidopsis cell culture response to cyclopentenone oxylipins

Project description:This SuperSeries is composed of the following subset Series: GSE10719: Response of Arabidopsis cell culture to phytoprostane A1; GSE10732: Identification of TGA-regulated genes in response to phytoprostane A1 and OPDA Experiment Overall Design: Refer to individual Series

2008-06-18 | E-GEOD-10749 | biostudies-arrayexpress

An evolutionarily ancient Fatty Acid Desaturase is required for the synthesis of hexadecatrienoic acid, which is the main source of the bioactive jasmonate in Marchantia polymorpha

Project description:Jasmonates are fatty acid derived hormones that regulate multiple aspects of plant development, growth and stress responses. Bioactive jasmonates differ between vascular plants and bryophytes (using jasmonoyl-L-isoleucine; JA-Ile and dinor-12-oxo-10,15(Z)-phytodienoic acid; dn-OPDA, respectively), but bind an evolutionarily conserved COI1 receptor. Whilst the biosynthetic pathways of JA-Ile in the model vascular plant Arabidopsis thaliana have been elucidated, the details of dn-OPDA biosynthesis in bryophytes are still unclear. Here, we identify an ortholog of Arabidopsis Fatty Acid Desaturase 5 (AtFAD5) in the model liverwort Marchantia polymorpha and show that FAD5 function is ancient and conserved between species separated by more than 450 million years of independent evolution. Similar to AtFAD5, MpFAD5 is required for the synthesis of 7Z-hexadecenoic acid. Consequently, in Mpfad5 mutants the hexadecanoic pathway is blocked, the dn-OPDA levels almost completely depleted and normal chloroplast development is impaired. Our results demonstrate that the main source of dn-OPDA in Marchantia is the hexadecanoic pathway and the contribution of the octadecanoid pathway, i.e. from OPDA, is minimal. Remarkably, despite extremely low levels of the bioactive hormone (dn-OPDA), MpCOI1-mediated responses to wounding and insect feeding can still be activated in Mpfad5 mutants, suggesting that dn-OPDA is not the only bioactive jasmonate and COI1 ligand in Marchantia.

2022-01-11 | GSE186451 | GEO

TGA transcription factors and jasmonate-independent COI1 signalling regulate specific plant responses to reactive oxylipins.

Project description:Jasmonates and phytoprostanes are oxylipins that regulate stress responses and diverse physiological and developmental processes. 12-Oxo-phytodienoic acid (OPDA) and phytoprostanes are structurally related electrophilic cyclopentenones, which activate similar gene expression profiles that are for the most part different from the action of the cyclopentanone jasmonic acid (JA) and its biologically active amino acid conjugates. Whereas JA-isoleucine signals through binding to COI1, the bZIP transcription factors TGA2, TGA5, and TGA6 are involved in regulation of gene expression in response to phytoprostanes. Here root growth inhibition and target gene expression were compared after treatment with JA, OPDA, or phytoprostanes in mutants of the COI1/MYC2 pathway and in different TGA factor mutants. Inhibition of root growth by phytoprostanes was dependent on COI1 but independent of jasmonate biosynthesis. In contrast, phytoprostane-responsive gene expression was strongly dependent on TGA2, TGA5, and TGA6, but not dependent on COI1, MYC2, TGA1, and TGA4. Different mutant and overexpressing lines were used to determine individual contributions of TGA factors to cyclopentenone-responsive gene expression. Whereas OPDA-induced expression of the cytochrome P450 gene CYP81D11 was primarily regulated by TGA2 and TGA5, the glutathione S-transferase gene GST25 and the OPDA reductase gene OPR1 were regulated by TGA5 and TGA6, but less so by TGA2. These results support the model that phytoprostanes and OPDA regulate differently (i) growth responses, which are COI1 dependent but jasmonate independent; and (ii) lipid stress responses, which are strongly dependent on TGA2, TGA5, and TGA6. Identification of molecular components in cyclopentenone signalling provides an insight into novel oxylipin signal transduction pathways.

| S-EPMC3580818 | biostudies-literature

Reactive electrophilic oxylipins trigger a heat stress-like response through HSFA1 transcription factors.

Project description:Abiotic and biotic stresses are often characterized by an induction of reactive electrophile species (RES) such as the jasmonate 12-oxo-phytodienoic acid (OPDA) or the structurally related phytoprostanes. Previously, RES oxylipins have been shown massively to induce heat-shock-response (HSR) genes including HSP101 chaperones. Moreover, jasmonates have been reported to play a role in basal thermotolerance. We show that representative HSR marker genes are strongly induced by RES oxylipins through the four master regulator transcription factors HSFA1a, b, d, and e essential for short-term adaptation to heat stress in Arabidopsis. When compared with Arabidopsis seedlings treated at the optimal acclimation temperature of 37 °C, the exogenous application of RES oxylipins at 20 °C induced a much weaker induction of HSP101 at both the gene and protein expression levels which, however, was not sufficient to confer short-term acquired thermotolerance. Moreover, jasmonate-deficient mutant lines displayed a wild-type-like HSR and were not compromised in acquiring thermotolerance. Hence, the OPDA- and RES oxylipin-induced HSR is not sufficient to protect seedlings from severe heat stress but may help plants to cope better with stresses associated with protein unfolding by inducing a battery of chaperones in the absence of heat.

| S-EPMC5100025 | biostudies-literature

Ligand diversity guarantees full activation of the jasmonate pathway in Marchantia polymorpha (array)

Project description:In plants, jasmonate signalling regulates a wide range of processes from growth and develop-ment to defence responses and thermotolerance. Bioactive jasmonates, such as JA, JA-Ile, OPDA and dn-OPDA, are derived from C18- and C16- fatty acids (FAs), which are found ubiquitously in the plant kingdom. Bryophytes also contain long chain C20- and C22- FAs (LCFAs), which are absent in most vascular plants but are found in organisms of other king-doms, including mammals. The existence of bioactive jasmonates derived from LCFAs is cur-rently unknown. Here, we describe the identification of an OPDA-like molecule derived from a C20-FA in Marchantia polymorpha, which we term C20-OPDA. This molecule accumulates upon wounding, and when applied exogenously can activate known COI1-dependent and -independent jasmonate responses. Furthermore, we identify a dn-OPDA-like molecule (Δ4-dn-OPDA) deriving from C20-OPDA and demonstrate it to be a ligand of the jasmonate co-receptor (MpCOI1-MpJAZ) in Marchantia. By analysing mutants involved in the production of LCFAs, we elucidate the major biosynthetic pathway of C20-OPDA and Δ4-dn-OPDA. Moreover, using a double mutant compromised in the production of both Δ4-dn-OPDA and dn-OPDA, we demonstrate the additive nature of these molecules in the activation of jasmonate responses. Taken together, our data identify LCFAs as a source of bioactive jasmonates that are essential to plant plasticity and resilience.

2022-05-17 | GSE195838 | GEO

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