The jasmonate pathway is involved differentially in the regulation of different defence responses in tobacco cells

Rickauer, Martina; Brodschelm, Wilhelm; Bottin, Arnaud; Véronési, Christophe; Grimal, Hélène; Esquerré-Tugayé, Marie-Thérèse

doi:10.1007/s004250050114

Cited by 67 publications

(38 citation statements)

References 41 publications

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“…The postulated role as a signal transducer in elicitor-induced defense reactions of plant cell cultures (Gundlach et al, 1992;Müller et al, 1993) was corroborated by similar results obtained with rice (Oryza sativa L.) cell suspension cultures elicited with N-acetylchitoheptaose (Nojiri et al, 1996) and tobacco (Nicotiana tabacum L.) cell cultures challenged with a species-specific elicitor from the tobacco pathogen Phytophthora parasitica var. nicotianae (Rickauer et al, 1997). Interestingly, in this latter study the authors pointed out that the elicitor and JAMe, respectively, are differentially involved in the onset of various defense responses.…”

Section: Introductionmentioning

confidence: 75%

“…Jasmonates have been shown to be insufficient for the activation of a full elicitor response in cultured parsley and tobacco cells (Ellard-Ivey and Douglas, 1996;Rickauer et al, 1997). In potato discs, distinct effects on the activation of single members of the 3-hydroxy-3-methylglutaryl-coenzyme A reductase gene family were reported for JAMe versus the fungal elicitor, arachidonic acid, leading to different metabolite profiles suggesting distinct signaling pathways (Choi et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

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The Role of Octadecanoids and Functional Mimics in Soybean Defense Responses

Fliegmann

Schüler

Boland

et al. 2003

Biological Chemistry

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Oxylipins of the jasmonate pathway and synthetic functional analogs have been analyzed for their elicitor-like activities in an assay based on the induced accumulation of glyceollins, the phytoalexins of soybean (Glycine max L.), in cell suspension cultures of this plant. Jasmonic acid (JA) and its methyl ester showed weak phytoalexin-inducing activity when compared to an early jasmonate biosynthetic precursor, 12-oxo-phytodienoic acid (OPDA), as well as to the bacterial phytotoxin coronatine and certain 6-substituted indanoyl-L-isoleucine methyl esters, which all were highly active. Interestingly, different octadecanoids and indanoyl conjugates induced the accumulation of transcripts of various defense-related genes to different degrees, indicating distinct induction competencies. Therefore, these signaling compounds and mimics were further analyzed for their effects on signal transduction elements, such as the transient enhancement of the cytosolic Ca 2 + concentration and MAP kinase activation, which are known to be initiated by a soybean pathogen-derived ␤-glucan elicitor. In contrast to the ␤-glucan elicitor, none of the other compounds tested triggered these early signaling elements. Moreover, endogenous levels of OPDA and JA in soybean cells were shown to be unaffected after treatment with ␤-glucans. Thus, OPDA and JA, which are functionally mimicked by coronatine and a variety of 6-substituted derivatives of indanoyl-L-isoleucine methyl ester, represent highly efficient signaling compounds of a lipid-based pathway not deployed in the ␤-glucan elicitor-initiated signal transduction.

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Section: Introductionmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

The Role of Octadecanoids and Functional Mimics in Soybean Defense Responses

Fliegmann

Schüler

Boland

et al. 2003

Biological Chemistry

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“…When treated with an elicitor from P. parasitica var. nicotianeae, cells in suspension promote a fast and transient increase in the levels of JA, which stops after incubation with eicosatetraynoic acid, an inhibitor of LOX enzyme (Rickauer et al, 1997). Although pre-treatment with eicosatetraynoic acid subdues the induction of the proteinase inhibitors by the fungal pathogen, the same effect was not seen when cells were treated with MeJA.…”

Section: Jasmonates As Molecular Coordinators Capable Of Orchestratinmentioning

confidence: 99%

“…Also, treatment with the pathogen, or MeJA, led to the expression of defense-related genes that code for type II proteinase inhibitors, glycoproteins rich in glycine and hydroxyproline, as well as glucanases and chitinases. Hence, synthesis of JA through the LOX pathway appears to be part of a complex regulatory mechanism involved in diverse defense responses (Rickauer et al, 1997).…”

Section: Jasmonates As Molecular Coordinators Capable Of Orchestratinmentioning

confidence: 99%

Review Jasmonates are phytohormones with multiple functions, including plant defense and reproduction

Avanci¹,

Luche²,

Goldman³

et al. 2010

Genet. Mol. Res.

205

133

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ABSTRACT. The plant hormones jasmonic acid and methyl jasmonate, along with their intermediate compounds, produced in the octadecanoid pathway, are important signaling molecules that are collectively called jasmonates. These are widespread in the plant kingdom and play crucial roles in biotic/abiotic stress responses, as well as in processes related to plant growth and development. Recently, it has been shown that jasmonates are also involved in reproductive processes. We present the most recent findings related to the biosynthesis, regulation and signaling mechanisms of jasmonates. Additionally, we discuss the identification of [(+)-7-iso-JA-L-Ile] as the active biological hormonal form of jasmonate; this fills the greatest gap in our knowledge about the signaling mechanism that is responsible for the activation of downstream genes in the jasmonate-signaling cascade. The identification of several 485 ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 9 (1): 484-505 (2010) Jasmonates: multifunctional hormones Arabidopsis thaliana mutants was crucial to the elucidation of the signaling mechanisms involved in jasmonate-mediated responses. Finally, the involvement of jasmonates in the reproductive process of Nicotiana tabacum L. is briefly discussed, since some of the main enzymes of the jasmonic acid biosynthesis pathway were identified in a stigma/style expressed sequence tag database (TOBEST) of this Solanaceae species.

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“…1) Besides pathogen attack, they have been shown to be induced by abiotic elicitors such as salicylic acid 2) and methyl jasmonate. 3) Additionally, b-1,3-glucanases have been found to be involved in several physiological and developmental processes such as seed germination 4) and pollen development. 5,6) Based on amino acid similarities, tobacco b-1,3-glucanases have been classiˆed into three structural classes.…”

mentioning

confidence: 99%