Jasmonic Acid Signaling Modulates Ozone-Induced Hypersensitive Cell Death

Rao, Mulpuri V.; Lee, Hyung‐il; Creelman, Robert A.; Mullet, John E.; Davis, Keith

doi:10.2307/3871179

Cited by 165 publications

(241 citation statements)

References 41 publications

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“…JA enhances anthocyanin accumulation and freezing tolerance (Hu et al, 2013b), inhibits seed germination (Miersch et al, 2008), hypocotyl elongation in the light and the ozone-induced spreading of cell death (Rao et al, 2000;Tuominen et al, 2004), and delays flowering (Robson et al, 2010). Conversely, ET suppresses anthocyanin accumulation (Jeong et al, 2010) and freezing tolerance and enhances seed germination (Linkies et al, 2009;Linkies and Leubner-Metzger, 2012), hypocotyl elongation in the light (Zhong et al, 2012), the ozone-induced spreading of cell death (Overmyer et al, 2000), and flowering (Ogawara et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Interaction between MYC2 and ETHYLENE INSENSITIVE3 Modulates Antagonism between Jasmonate and Ethylene Signaling inArabidopsis

et al. 2014

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Plants have evolved sophisticated mechanisms for integration of endogenous and exogenous signals to adapt to the changing environment. Both the phytohormones jasmonate (JA) and ethylene (ET) regulate plant growth, development, and defense. In addition to synergistic regulation of root hair development and resistance to necrotrophic fungi, JA and ET act antagonistically to regulate gene expression, apical hook curvature, and plant defense against insect attack. However, the molecular mechanism for such antagonism between JA and ET signaling remains unclear. Here, we demonstrate that interaction between the JA-activated transcription factor MYC2 and the ET-stabilized transcription factor ETHYLENE-INSENSITIVE3 (EIN3) modulates JA and ET signaling antagonism in Arabidopsis thaliana. MYC2 interacts with EIN3 to attenuate the transcriptional activity of EIN3 and repress ET-enhanced apical hook curvature. Conversely, EIN3 interacts with and represses MYC2 to inhibit JA-induced expression of wound-responsive genes and herbivory-inducible genes and to attenuate JA-regulated plant defense against generalist herbivores. Coordinated regulation of plant responses in both antagonistic and synergistic manners would help plants adapt to fluctuating environments.

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Section: Discussionmentioning

confidence: 99%

Interaction between MYC2 and ETHYLENE INSENSITIVE3 Modulates Antagonism between Jasmonate and Ethylene Signaling inArabidopsis

et al. 2014

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“…This response is presumably attenuated by JA in the wild type. The JAinsensitive mutant jar1 is more sensitive to ozone compared to the wild type because of the higher accumulation of hydrogen peroxide and SA after ozone exposure (Rao et al, 2000). In vtc1, ozone fumigation could boost already elevated SA levels well above the wild type, triggering programmed cell death and ozone sensitivity, which is apparent as chlorotic lesions and tissue collapse.…”

Section: A Subset Of Senescence-associated Gene Transcripts Is Elevatmentioning

confidence: 99%

The Timing of Senescence and Response to Pathogens Is Altered in the Ascorbate-Deficient Arabidopsis Mutant vitamin c-1

et al. 2004

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The ozone-sensitive Arabidopsis mutant vitamin c-1 (vtc1) is deficient in l-ascorbic acid (AsA) due to a mutation in GDP-Man pyrophosphorylase (Conklin et al., 1999), an enzyme involved in the AsA biosynthetic pathway (Smirnoff et al., 2001). In this study, the physiology of this AsA deficiency was initially investigated in response to biotic (virulent pathogens) stress and subsequently with regards to the onset of senescence. Infection with either virulent Pseudomonas syringae or Peronospora parasitica resulted in largely reduced bacterial and hyphal growth in the vtc1 mutant in comparison to the wild type. When vitamin c-2 (vtc2), another AsA-deficient mutant, was challenged with P. parasitica, growth of the fungus was also reduced, indicating that the two AsA-deficient mutants are more resistant to these pathogens. Induction of pathogenesis-related proteins PR-1 and PR-5 is significantly higher in vtc1 than in the wild type when challenged with virulent P. syringae. In addition, the vtc1 mutant exhibits elevated levels of some senescence-associated gene (SAG) transcripts as well as heightened salicylic acid levels. Presumably, therefore, low AsA is causing vtc1 to enter at least some stage(s) of senescence prematurely with an accompanying increase in salicylic acid levels that results in a faster induction of defense responses.

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“…The similarity of SCPL proteins 20 and 21 to the wound/jasmonate-inducible Ser carboxypeptidase from tomato suggest that they may be important to defense responses in Arabidopsis. As in tomatoes, jasmonate acts as a signaling molecule in Arabidopsis in the defense against insects, pathogens, and abiotic stress (McConn et al, 1997;Thomma et al, 1999;Overmyer et al, 2000;Rao et al, 2000). SCPL proteins 20 and 21 might therefore play a role similar to their tomato homolog, with the diverse expression of SCPL gene 20 making its encoded protein a particularly good candidate for involvement in plant defense.…”

Section: Scpl Proteins In Clades I and Ii Appear To Represent Plant-smentioning

confidence: 99%

An Expression and Bioinformatics Analysis of the Arabidopsis Serine Carboxypeptidase-Like Gene Family

2005

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The Arabidopsis (Arabidopsis thaliana) genome encodes a family of 51 proteins that are homologous to known serine carboxypeptidases. Based on their sequences, these serine carboxypeptidase-like (SCPL) proteins can be divided into several major clades. The first group consists of 21 proteins which, despite the function implied by their annotation, includes two that have been shown to function as acyltransferases in plant secondary metabolism: sinapoylglucose:malate sinapoyltransferase and sinapoylglucose:choline sinapoyltransferase. A second group comprises 25 SCPL proteins whose biochemical functions have not been clearly defined. Genes encoding representatives from both of these clades can be found in many plants, but have not yet been identified in other phyla. In contrast, the remaining SCPL proteins include five members that are similar to serine carboxypeptidases from a variety of organisms, including fungi and animals. Reverse transcription PCR results suggest that some SCPL genes are expressed in a highly tissue-specific fashion, whereas others are transcribed in a wide range of tissue types. Taken together, these data suggest that the Arabidopsis SCPL gene family encodes a diverse group of enzymes whose functions are likely to extend beyond protein degradation and processing to include activities such as the production of secondary metabolites.Serine carboxypeptidases (SCPs) are members of the a/b hydrolase family of proteins, which make use of a Ser-Asp-His catalytic triad to cleave the carboxyterminal peptide bonds of their protein or peptide substrates (Hayashi et al., 1973(Hayashi et al., , 1975Bech and Breddam, 1989;Liao and Remington, 1990;Liao et al., 1992;Ollis et al., 1992). Proteins that contain this catalytic triad and are otherwise homologous to SCPs have been found in a variety of organisms (Doi et al., 1980;Kim and Hayashi, 1983;Breddam, 1986;Baulcombe et al., 1987;Galjart et al., 1988;Bradley, 1992;Degan et al., 1994;Endrizzi et al., 1994;Wajant et al., 1994;Jones et al., 1996;Li and Steffens, 2000). Many of these serine carboxypeptidase-like (SCPL) proteins have been annotated as peptidases based only on this shared sequence similarity; however, studies have shown that some of them function not as peptidases, but as acyltransferases and lyases (Wajant et al., 1994;Lehfeldt et al., 2000;Li and Steffens, 2000;Shirley et al., 2001). For example, several SCPL proteins have been shown to catalyze the production of plant secondary metabolites involved in herbivory defense and UV protection (Wajant et al., 1994;Lehfeldt et al., 2000;Li and Steffens, 2000), including the hydroxynitrile lyase from Sorghum bicolor (SbHNL) necessary for cyanogenesis, and the acyltransferases in wild tomato (Lycopersicon pennellii) that catalyze the formation 2,3,4-isobutyryl-Glc (Wajant et al., 1994;Lehfeldt et al., 2000). Two enzymes in Arabidopsis (Arabidopsis thaliana) responsible for sinapate ester biosynthesis are also SCPL proteins. Sinapoylglucose:malate sinapoyltransferase (SMT) catalyzes the formation of s...

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Jasmonic Acid Signaling Modulates Ozone-Induced Hypersensitive Cell Death

Cited by 165 publications

References 41 publications

Interaction between MYC2 and ETHYLENE INSENSITIVE3 Modulates Antagonism between Jasmonate and Ethylene Signaling inArabidopsis

Interaction between MYC2 and ETHYLENE INSENSITIVE3 Modulates Antagonism between Jasmonate and Ethylene Signaling inArabidopsis

The Timing of Senescence and Response to Pathogens Is Altered in the Ascorbate-Deficient Arabidopsis Mutant vitamin c-1

An Expression and Bioinformatics Analysis of the Arabidopsis Serine Carboxypeptidase-Like Gene Family

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