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JA-Ile coordinates anthesis and floral attractants in wild tobacco through COI1 dependent and independent mechanisms.

ABSTRACT: Identification of coronatine/jasmonoyl-isoleucine-regulated transcripts and encoded metabolic processes in late stages of Nicotiana attenuata flower development.

ORGANISM(S): Nicotiana attenuata

PROVIDER: GSE52765 | GEO | 2014/12/31

SECONDARY ACCESSION(S): PRJNA229985

REPOSITORIES: GEO

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Subtype-selective agonists of COI1-JAZ co-receptors screened from the stereochemical-isomers of jasmonate mimic

Project description:We report the development of subtype selective ligands into plant hormone jasmonate co-receptor COI1-JAZ. Plant hormone jasmonoyl isoleucine and the structural mimic natural product coronatine has non-selective affinity with 13 species of COI1-JAZ co-receptors in Arabidopsis thaliana to cause bath of bacterial defense and growth inhibition. Some subtype selective ligands were developed by our chemical screening and activated the part of whole jasmonate signaling. To examine the mode-of-action of the subtype selective ligand, gene expression profiles of WT and jaz9 mutant treated with mock or with coronatine (2) and subtype selective ligands (2e and 12) was performed using the RNA-seq. The subtype selective ligand induced partial activation of jasmonate signaling to cause defense responses against bacterial pathogen without growth inhibition.

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JAZi-mediated jasmonate signaling is invoved in floral defense in Nicotiana attenuata

Project description:Identification of transcripts that change expression in Nicotiana attenuata plants with reduced expression of JAZi in flowers

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2013-03-29 | GSE45572 | GEO

A jasmonate ZIM-domain protein NaJAZd regulates floral jasmonic acid levels and counteracts flower abscission in Nicotiana attenuata plants

Project description:Identification of transcripts that change expression in Nicotiana attenuata plants with reduced expression of JAZd after elicitation with oral secretions of Manduca sexta larvae.

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Rational design of a ligand-based antagonist of jasmonate perception

Project description:The phytohormone (+)-7-iso-jasmonoyl-L-isoleucine (JA-Ile) is a major regulator of developmental and stress responses in plants. The perception of JA-Ile involves the formation of a ternary complex with the F-box protein COI1 and a member of the JAZ family of co-repressors, which leads to JAZ degradation. Coronatine (COR) is a bacterial phytotoxin that functionally mimics JA-Ile and interacts with the co-receptor COI1-JAZ complex with higher affinity than JA-Ile. Based on the crystal structure of the co-receptor, we designed ligand derivatives that spatially impede the interaction of the co-receptor proteins and, therefore, should act as competitive antagonists of COR or JA-Ile. One derivative, Coronatine O-methyloxime (COR-MO), shows a strong activity preventing COI-JAZ interaction and the subsequent JAZ degradation. COR-MO efficiently reverts the effects of JA-Ile or COR treatments on JA-mediated responses, such as anthocyanin accumulation, root-growth inhibition and gene expression in Arabidopsis plants. Moreover, it potentiates plant resistance preventing the effect of bacterially produced COR during Pseudomonas syringae infections in different plant species. In addition to the utility of COR-MO for Plant Biology research, our results underscore its biotechnological and agronomical potential for a safer and sustainable agriculture. Two-condition experiment, Col-0 vs Col-0 plants treated 2h with Coronatine 0-methyloxime (COR-MO) and Col-0 plants treated 2h with Coronatine vs Col-0 plants treated 2h with Coronatine plus COR-MO. Biological replicates: 4 control and 4 treated replicates

2014-06-20 | E-GEOD-56027 | biostudies-arrayexpress

OsJAR1M-bM-^HM-^Rrelated JA-inducible genes in osjar1 tos17 mutant rice leaves.

Project description:Jasmonates is inductively produced as a major plant hormone responsible for defense reactions in plants against both biotic and abiotic stresses, such as pathogen infection and mechanical wounding. Jasmonoyl isoleucine is known to be a bioactive compound of jasmonate and plays a pivotal role for plant defenses. We identified OsJAR1M-bM-^HM-^Rrelated JA-inducible genes in osjar1 tos17 mutant (osjar1-2) rice leaves 0 - 2 h after JA treatment using 44k microarray. Expression profiling in the wild-type rice leaves treated with jasmonic acid for 0, 0.5, 1, and 2 h was compared with that in the osjar1 mutant leaves treated with jasmonic acid for 0, 0.5, 1, and 2 h using two-color method with three biological replicates.

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NaMYB8 regulates distinct, optimally distributed herbivore defense traits

Project description:Identifying whether NaMYB8 regulated genes in Nicotiana attenuata

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Evidence for an evolutionary hourglass pattern in herbivore-induced transcriptomic responses

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Characterization of Nicotiana attenuata plants with reduced expression of HD-Zip HD20 (ir-hd20 plants).

Project description:Identification of transcripts that change expression in corollas of Nicotiana attenuata plants with reduced expression of the transcription factor HD20. Gene expression in opening corollas of Nicotiana attenuata wild type and ir-hd20 plants was measured from isolated corollas collected at 12 pm. Three independent experiments were performed with wild type plants and three independent experiments were performed with ir-hd20 plants. A total of 274 genes were identified as differentially regulated in ir-hd20 plants compared to wild type plants.

2013-12-24 | E-GEOD-33682 | biostudies-arrayexpress

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