Phytochrome Chromophore Deficiency Leads to Overproduction of Jasmonic Acid and Elevated Expression of Jasmonate-Responsive Genes in Arabidopsis

Zhai, Qingzhe; Li, Changbao; Zheng, Weihui; Wu, Xin; Zhao, Jiuhai; Zhou, Guoxin; Jiang, Hongling; Sun, Jiaqiang; Lou, Yonggen

doi:10.1093/pcp/pcm076

Cited by 61 publications

(58 citation statements)

References 61 publications

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“…The influence of JA signaling on phyA-mediated responses was reciprocated: phyA was partially insensitive to JA-induced root growth inhibition and had altered oxylipin content and attenuated induction of the JA response gene VSP1. Therefore, our work supports previous reports that Arabidopsis mutants defective in JA signaling (fin219/jar1, Hsieh et al, 2000;Staswick et al, 2002;Chen et al, 2007;myc2/jin1, Lorenzo et al, 2004;Yadav et al, 2005) express an altered light phenotype and that Arabidopsis mutants defective in light signaling (hy1/hy2, Zhai et al, 2007;det3, Brü x et al, 2008;phyB, Moreno et al, 2009) display JA-related phenotypes. In this context, we show that FR light regulated the expression of the JA-induced genes AOC1, JIN1, JAZ1, and VSP1.…”

Section: Discussionsupporting

confidence: 92%

“…In a screen for mutants with increased sensitivity to JA, a mutation in LONG HYPOCOTYL1 (HY1), which encodes a plastid heme oxygenase required for phytochrome chromophore biosynthesis, was recovered. Subsequently, it was demonstrated that mutations in either HY1 or HY2, which encodes a phytochromobilin synthase, cause elevated JA production and sensitivity (Zhai et al, 2007). The ecological significance of an interaction between phytochrome and JA signaling was revealed in a study of Arabidopsis plants grown at high density or in illumination supplemented with FR light.…”

Section: Introductionmentioning

confidence: 99%

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Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

et al. 2010

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Jasmonate (JA) activates plant defense, promotes pollen maturation, and suppresses plant growth. An emerging theme in JA biology is its involvement in light responses; here, we examine the interdependence of the JA-and light-signaling pathways in Arabidopsis thaliana. We demonstrate that mutants deficient in JA biosynthesis and signaling are deficient in a subset of high irradiance responses in far-red (FR) light. These mutants display exaggerated shade responses to low, but not high, R/FR ratio light, suggesting a role for JA in phytochrome A (phyA) signaling. Additionally, we demonstrate that the FR light-induced expression of transcription factor genes is dependent on CORONATINE INSENSITIVE1 (COI1), a central component of JA signaling, and is suppressed by JA. phyA mutants had reduced JA-regulated growth inhibition and VSP expression and increased content of cis-(+)-12-oxophytodienoic acid, an intermediate in JA biosynthesis. Significantly, COI1-mediated degradation of JASMONATE ZIM DOMAIN1-b-glucuronidase (JAZ1-GUS) in response to mechanical wounding and JA treatment required phyA, and ectopic expression of JAZ1-GUS resulted in exaggerated shade responses. Together, these results indicate that JA and phyA signaling are integrated through degradation of the JAZ1 protein, and both are required for plant responses to light and stress.

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Section: Discussionsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

et al. 2010

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“…Free JA in the hypocotyl of the gh3.3-1gh3.5-2gh3.6-1 triple mutant was twice that in the wild type at T0, and after 3 and 9 h in the light, the percentage of decline in endogenous JA was greater for the triple mutant than for the wild type, but it was still significantly higher than in the wild type at 9 h. Three days after transfer to the light, the amount was markedly decreased in both the wild type and the triple mutant, in agreement with published results showing that JA biosynthesis is regulated by light (Zhai et al, 2007). One way to explain the ARF6, ARF8, and ARF17 and their regulatory microRNAs interact in a complex network ) and act upstream of GH3.3, GH3.5, and GH3.6.…”

Section: Discussionsupporting

confidence: 91%

Auxin Controls Arabidopsis Adventitious Root Initiation by Regulating Jasmonic Acid Homeostasis

et al. 2012

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Vegetative shoot-based propagation of plants, including mass propagation of elite genotypes, is dependent on the development of shoot-borne roots, which are also called adventitious roots. Multiple endogenous and environmental factors control the complex process of adventitious rooting. In the past few years, we have shown that the auxin response factors ARF6 and ARF8, targets of the microRNA miR167, are positive regulators of adventitious rooting, whereas ARF17, a target of miR160, is a negative regulator. We showed that these genes have overlapping expression profiles during adventitious rooting and that they regulate each other's expression at the transcriptional and posttranscriptional levels by modulating the homeostasis of miR160 and miR167. We demonstrate here that this complex network of transcription factors regulates the expression of three auxininducible Gretchen Hagen3 (GH3) genes, GH3.3, GH3.5, and GH3.6, encoding acyl-acid-amido synthetases. We show that these three GH3 genes are required for fine-tuning adventitious root initiation in the Arabidopsis thaliana hypocotyl, and we demonstrate that they act by modulating jasmonic acid homeostasis. We propose a model in which adventitious rooting is an adaptive developmental response involving crosstalk between the auxin and jasmonate regulatory pathways.

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“…Although these effects on growth-related gene expression could partially result from the lincomycin treatment attenuating metabolism, the possibility of the integration of light and plastid signaling primarily affecting growth-related gene expression is supported by reports that a burst of chloroplastic singlet oxygen production in the Arabidopsis flu mutant rapidly affects cry1 signaling (Danon et al, 2006) and causes a rapid inhibition of growth (op den Camp et al, 2003). Our findings that chloroplast dysfunction (1) can attenuate the light-regulated expression of genes that are annotated as contributing to the JA response and (2) can convert light from a positive to a negative regulator of genes that contribute to JA biosynthesis provide evidence that chloroplast dysfunction can affect the integration of light and JA signaling (Zhai et al, 2007;Moreno et al, 2009;Robson et al, 2010). These findings also provide evidence that the integration of light and plastid signaling might attenuate JA signaling.…”

Section: Plastid Dysfunction Affects the Nature Of Light Signalingmentioning

confidence: 77%

Plastids Are Major Regulators of Light Signaling in Arabidopsis

et al. 2012

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We previously provided evidence that plastid signaling regulates the downstream components of a light signaling network and that this signal integration coordinates chloroplast biogenesis with both the light environment and development by regulating gene expression. We tested these ideas by analyzing light-and plastid-regulated transcriptomes in Arabidopsis (Arabidopsis thaliana). We found that the enrichment of Gene Ontology terms in these transcriptomes is consistent with the integration of light and plastid signaling (1) down-regulating photosynthesis and inducing both repair and stress tolerance in dysfunctional chloroplasts and (2) helping coordinate processes such as growth, the circadian rhythm, and stress responses with the degree of chloroplast function. We then tested whether factors that contribute to this signal integration are also regulated by light and plastid signals by characterizing T-DNA insertion alleles of genes that are regulated by light and plastid signaling and that encode proteins that are annotated as contributing to signaling, transcription, or no known function. We found that a high proportion of these mutant alleles induce chloroplast biogenesis during deetiolation. We quantified the expression of four photosynthesis-related genes in seven of these enhanced deetiolation (end) mutants and found that photosynthesis-related gene expression is attenuated. This attenuation is particularly striking for Photosystem II subunit S expression. We conclude that the integration of light and plastid signaling regulates a number of END genes that help optimize chloroplast function and that at least some END genes affect photosynthesis-related gene expression.

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Phytochrome Chromophore Deficiency Leads to Overproduction of Jasmonic Acid and Elevated Expression of Jasmonate-Responsive Genes in Arabidopsis

Cited by 61 publications

References 61 publications

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

Jasmonate and Phytochrome A Signaling inArabidopsisWound and Shade Responses Are Integrated through JAZ1 Stability

Auxin Controls Arabidopsis Adventitious Root Initiation by Regulating Jasmonic Acid Homeostasis

Plastids Are Major Regulators of Light Signaling in Arabidopsis

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