The Basic Helix-Loop-Helix Transcription Factor MYC2 Directly Represses<i>PLETHORA</i>Expression during Jasmonate-Mediated Modulation of the Root Stem Cell Niche in<i>Arabidopsis</i>

Chen, Qian; Sun, Jiaqiang; Zhai, Qingzhe; Zhou, Wenkun; Qi, Linlin; Xu, Li; Wang, Bao; Chen, Rong; Jiang, Hongling; Qi, Jing; Li, Xugang; Palme, Klaus; Li, Chuanyou

doi:10.1105/tpc.111.089870

Cited by 397 publications

(326 citation statements)

References 94 publications

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“…Exogenously supplied JA is known to inhibit root growth by reducing both root meristem activity and cell length in the DZ (27). Our results, based on genetic approaches that did not require treatment with exogenous JA, indicate that root shortening in ninja mutants is primarily due to a reduction in cell length in the DZ.…”

Section: Jar1 Is Indispensable For Activating Ja Signaling In Roots Amentioning

confidence: 56%

“…Finally, we assessed if ninja root shortening was associated with a reduction in cell proliferation or cell elongation or, as when the WT is grown in the presence of exogenous MeJA, a combination of both (27). As an indicator of cell proliferation, we determined cell number in the root MZ of WT and ninja mutants, and no significant difference between them was detected (Fig.…”

Section: Primary Root Shortening In Ninja As a Results Of Reduced Cellmentioning

confidence: 99%

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Role of NINJA in root jasmonate signaling

Acosta

Gasperini

Chételat

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

139

170

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Wound responses in plants have to be coordinated between organs so that locally reduced growth in a wounded tissue is balanced by appropriate growth elsewhere in the body. We used a JASMONATE ZIM DOMAIN 10 (JAZ10) reporter to screen for mutants affected in the organ-specific activation of jasmonate (JA) signaling in Arabidopsis thaliana seedlings. Wounding one cotyledon activated the reporter in both aerial and root tissues, and this was either disrupted or restricted to certain organs in mutant alleles of core components of the JA pathway including COI1, OPR3, and JAR1. In contrast, three other mutants showed constitutive activation of the reporter in the roots and hypocotyls of unwounded seedlings. All three lines harbored mutations in Novel Interactor of JAZ (NINJA), which encodes part of a repressor complex that negatively regulates JA signaling. These ninja mutants displayed shorter roots mimicking JA-mediated growth inhibition, and this was due to reduced cell elongation. Remarkably, this phenotype and the constitutive JAZ10 expression were still observed in backgrounds lacking the ability to synthesize JA or the key transcriptional activator MYC2. Therefore, JA-like responses can be recapitulated in specific tissues without changing a plant's ability to make or perceive JA, and MYC2 either has no role or is not the only derepressed transcription factor in ninja mutants. Our results show that the role of NINJA in the root is to repress JA signaling and allow normal cell elongation. Furthermore, the regulation of the JA pathway differs between roots and aerial tissues at all levels, from JA biosynthesis to transcriptional activation. root growth | herbivory | plant fertility | mapping by sequencing

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Section: Jar1 Is Indispensable For Activating Ja Signaling In Roots Amentioning

confidence: 56%

Section: Primary Root Shortening In Ninja As a Results Of Reduced Cellmentioning

confidence: 99%

Role of NINJA in root jasmonate signaling

Acosta

Gasperini

Chételat

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

139

170

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“…Upon perception of JA signal (Fonseca et al, 2009;Yan et al, 2009;Sheard et al, 2010), the F-box protein CORO-NATINE INSENSITIVE1 (COI1) (Xie et al, 1998;Yan et al, 2009) recruits the JASMONATE ZIM-DOMAIN (JAZ) proteins (Chini et al, 2007;Thines et al, 2007;Yan et al, 2007) for degradation, which leads to the release of various downstream factors, including MYC2/JASMONATE INSENSITIVE1 (JIN1), MYC3, and MYC4 (Cheng et al, 2011;Fernández-Calvo et al, 2011;Niu et al, 2011), as well as WD-repeat/bHLH/MYB complex , MYB21, MYB24, and MYB57 (Mandaokar et al, 2006;Song et al, 2011) and the IIId bHLH factors (Nakata et al, 2013;Song et al, 2013b), which regulate diverse JA-mediated functions. These functions include root growth (Dathe et al, 1981;Chen et al, 2011), apical hook formation (Turner et al, 2002), flowering (Robson et al, 2010), stamen development (McConn and Browse, 1996;Song et al, 2011Song et al, , 2013a, leaf senescence (Ueda and Kato, 1980;Shan et al, 2011), secondary metabolism (De Geyter et al, 2012;Schweizer et al, 2013), drought responses (Seo et al, 2011), wounding responses (Mason and Mullet, 1990;Acosta et al, 2013;Mousavi et al, 2013), and defense against pathogen infection Vijayan et al, 1998;Melotto et al, 2006;Rowe et al, 2010;Yang et al, 2012;Zheng et al, 2012) and insect attack (McConn et al, 1997;…”

Section: Introductionmentioning

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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“…Auxin and cytokinin have been reported to create a transcriptional circuit for regulating PLT activity [6]. In addition to auxin and cytokinin, Jasmonate is known as a regulator of PLT expression through MYC2 [7]. Root growth factor (RGF), which is a peptide hormone, also regulates PLT activity [8].…”

mentioning

confidence: 99%

MYB30 regulates root cell elongation under abscisic acid signaling

Sakaoka

Mabuchi

Morikami

et al. 2018

Communicative & Integrative Biology

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Reactive oxygen species (ROS) and plant hormones play important roles in regulating plant growth and stress responses as signaling molecules. Abscisic acid (ABA) is known as the key regulator of both abiotic and biotic stress responses. During stress responses, ABA is known to regulate ROS production, indicating that important crosstalk occurs between ROS and ABA signaling. We recently reported that MYB30, an MYB-type transcription factor, regulates root cell elongation under ROS signaling. In this study, we analyzed the molecular interaction between ROS and ABA signal during for root development, which is mediated through MYB30 transcriptional regulation. We showed that MYB30-regulated root cell elongation was mediated by ROS production under ABA signaling. Our findings will provide one piece of evidence of the complex cross talk between ROS and hormone signaling that regulates root development.

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The Basic Helix-Loop-Helix Transcription Factor MYC2 Directly RepressesPLETHORAExpression during Jasmonate-Mediated Modulation of the Root Stem Cell Niche inArabidopsis

Cited by 397 publications

References 94 publications

Role of NINJA in root jasmonate signaling

Role of NINJA in root jasmonate signaling

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

MYB30 regulates root cell elongation under abscisic acid signaling

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