Interactive Effects of Jasmonic Acid, Salicylic Acid, and Gibberellin on Induction of Trichomes in Arabidopsis

Traw, M. Brian; Bergelson, Joy

doi:10.1104/pp.103.027086

Cited by 344 publications

(287 citation statements)

References 49 publications

(37 reference statements)

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“…Trichomes are potentially an ideal point for plants to sense many environmental signals such as light and pathogen elicitors, and expression of AGB1 in this location could reflect a role in the perception of such stimuli. Alternatively, a trichome-localized heterotrimer could mediate wound-or pathogen-induced signals from within the plant, such as jasmonic acid, which has been linked to Gproteins (Trusov et al 2006) and is known to influence trichome proliferation in response to mechanical wounding (Traw and Bergelson 2003). Although trichome-specific expression was not previously detected for either AGB1, AGG1 or AGG2 promoter-GUS fusions, it was detected for five of the 15 AtMLO gene family members, which are candidate Arabidopsis GPCRs (Chen et al 2006b).…”

Section: Discussionmentioning

confidence: 98%

Expression analysis and subcellular localization of the Arabidopsis thaliana G-protein β-subunit AGB1

Anderson

Botella

2007

Plant Cell Rep

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Heterotrimeric GTP-binding proteins (G-proteins), consisting of Ga, Gb, and Gc subunits, function as molecular switches in many eukaryotic signal transduction pathways. In contrast to many eukaryotes, plants contain very few G-protein subunit isoforms that mediate a diverse array of signalling functions. We investigated the contribution of cell type-specific expression and subcellular localization to this multifunctional signalling capacity for the Arabidopsis thaliana Gb subunit, AGB1. Analysis of AGB1 promoter::b-glucuronidase (GUS) fusions in germinating seeds, seedlings, and flowering plants revealed that AGB1 is widely expressed throughout development in a complex manner. As well as demonstrating similarities to existing Arabidopsis G-protein subunit expression data, several features of the AGB1 expression pattern align closely with known or proposed G-protein functions. A C-terminal AGB1-green fluorescent protein (GFP) fusion was localized at the plasma membrane and in the nucleus of leaf epidermal cells, trichomes and root cells, supporting previous evidence that plant G-protein functionality relies on subcellular compartmentalization.

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Section: Discussionmentioning

confidence: 98%

Expression analysis and subcellular localization of the Arabidopsis thaliana G-protein β-subunit AGB1

Anderson

Botella

2007

Plant Cell Rep

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“…Therefore, JAs can be considered to be good candidates for the mediator of wound-induced trichome formation, which is also a systemic response. In support of this idea, exogenous JA treatment increases leaf trichome density in Arabidopsis and in tomato (Solanum lycopersicum L.) (Traw and Bergelson, 2003;Boughton et al, 2005). However, the significance Jasmonic acid control of GLABRA3 links inducible defense and trichome patterning in Arabidopsis and action of endogenous JAs during trichome development remain unknown.…”

Section: Introductionmentioning

confidence: 84%

“…Exogenous treatment of unwounded plants with jasmonic acid or methyl jasmonate (MeJA) mimics the effect of wounding and induces increased trichomes, suggesting the involvement of JA signal in trichome patterning events (Fig. 1C,D) (Traw and Bergelson, 2003). However, the role of endogenous JA remains unclear because jasmonate resistant1-1 (jar1-1), a weakly JA-resistant mutant, shows normal induction of trichomes in response to wounding (Traw and Bergelson, 2003).…”

Section: Endogenous Ja Regulates Trichome Patterningmentioning

confidence: 99%

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Jasmonic acid control of GLABRA3 links inducible defense and trichome patterning inArabidopsis

et al. 2009

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Once attacked by herbivores, plants regenerate new leaves with increased trichome density as an inducible defense. Trichomes are specified from neighboring epidermal cells through local cell-cell interactions in the leaf primordia. However, the molecular mechanism of how herbivore-induced damage at older leaves remodels the pattern of trichome fate specification at newly forming leaves is largely unknown. In this study, we show that mutations in either the biosynthetic or signaling pathway of jasmonates (JAs), long-distance wound signals, abolish the wound-induced formation of trichomes. To identify the factors linking JA signaling to trichome fate specification, we isolated a novel class of mutants, unarmed (urm), which lack trichome induction but show otherwise normal responses to JAs. URM9 encodes an Importin β family protein, and URM23 is identical to TRANSPARENT TESTA GLABRA1 (TTG1), the product of which interacts with the bHLH transcription factor GLABRA3 (GL3). Loss of either URM9 or URM23 disrupts the subnuclear localization of GL3, thus implicating GL3 in trichome induction. The expression of GL3 was enhanced by JA treatment prior to trichome initiation. Genetic analysis of multiple trichome mutants shows that GL3, in concert with the R2R3-Myb transcription factor GLABRA1 (GL1), promotes trichome fate in response to JA in a dosage-dependent manner. These results indicate that GL3 is a key transcription factor of wound-induced trichome formation acting downstream of JA signaling in Arabidopsis.

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“…ABA is also believed to be involved in plant development as an antagonist of GAs. Since gibberellins were shown to be able to interact with jasmonic acid and salicylic acid pathways to regulate trichome development [52], it would be interesting to investigate in the future whether the antagonistic interaction between GAs and ABA also plays a role in trichome development.…”

Section: Discussionmentioning

confidence: 99%

Disruption of the 1-deoxy-D-xylulose-5-phosphate reductoisomerase (DXR) gene results in albino, dwarf and defects in trichome initiation and stomata closure in Arabidopsis

Xing

Miao

et al. 2010

Cell Res

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1-Deoxy-d-xylulose-5-phosphate reductoisomerase (DXR) is an important enzyme involved in the 2-C-methyl-d-erythritol-4-phosphate (MEP) pathway which provides the basic five-carbon units for isoprenoid biosynthesis. To investigate the role of the MEP pathway in plant development and metabolism, we carried out detailed analyses on a dxr mutant (GK_215C01) and two DXR transgenic co-suppression lines, OX-DXR-L2 and OX-DXR-L7. We found that the dxr mutant was albino and dwarf. It never bolted, had significantly reduced number of trichomes and most of the stomata could not close normally in the leaves. The two co-suppression lines produced more yellow inflorescences and albino sepals with no trichomes. The transcription levels of genes involved in trichome initiation were found to be strongly affected, including GLABRA1, TRANSPARENT TESTA GLABROUS 1, TRIPTYCHON and SPINDLY, expression of which is regulated by gibberellic acids (GAs). Exogenous application of GA 3 could partially rescue the dwarf phenotype and the trichome initiation of dxr, whereas exogenous application of abscisic acid (ABA) could rescue the stomata closure defect, suggesting that lower levels of both GA and ABA contribute to the phenotype in the dxr mutants. We further found that genes involved in the biosynthetic pathways of GA and ABA were coordinately regulated. These results indicate that disruption of the plastidial MEP pathway leads to biosynthetic deficiency of photosynthetic pigments, GAs and ABA, and thus the developmental abnormalities, and that the flux from the cytoplasmic mevalonate pathway is not sufficient to rescue the deficiency caused by the blockage of the plastidial MEP pathway. These results reveal a critical role for the MEP biosynthetic pathway in controlling the biosynthesis of isoprenoids.

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Interactive Effects of Jasmonic Acid, Salicylic Acid, and Gibberellin on Induction of Trichomes in Arabidopsis

Cited by 344 publications

References 49 publications

Expression analysis and subcellular localization of the Arabidopsis thaliana G-protein β-subunit AGB1

Expression analysis and subcellular localization of the Arabidopsis thaliana G-protein β-subunit AGB1

Jasmonic acid control of GLABRA3 links inducible defense and trichome patterning inArabidopsis

Disruption of the 1-deoxy-D-xylulose-5-phosphate reductoisomerase (DXR) gene results in albino, dwarf and defects in trichome initiation and stomata closure in Arabidopsis

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