Genomic basis for light control of plant development

Li, Jigang; Terzaghi, William; Deng, Xing Wang

doi:10.1007/s13238-012-2016-7

Cited by 47 publications

(38 citation statements)

References 134 publications

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“…miRNAs act as universal regulatory factors that modulate gene expression in various biological processes in animals and plants, including developmental regulation and environmental adaptation (Lee et al, 1993;Kidner and Martienssen, 2005;Kim, 2005;Liu et al, 2005;Chen, 2009;Li et al, 2012;Sunkar et al, 2012). Elaborate biogenesis pathways have evolved to produce miRNAs (Chen, 2005;Jones-Rhoades et al, 2006;Xie et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

NOT2 Proteins Promote Polymerase II–Dependent Transcription and Interact with Multiple MicroRNA Biogenesis Factors in Arabidopsis

et al. 2013

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MicroRNAs (miRNAs) play key regulatory roles in numerous developmental and physiological processes in animals and plants. The elaborate mechanism of miRNA biogenesis involves transcription and multiple processing steps. Here, we report the identification of a pair of evolutionarily conserved NOT2_3_5 domain-containing-proteins, NOT2a and NOT2b (previously known as At-Negative on TATA less2 [NOT2] and VIRE2-INTERACTING PROTEIN2, respectively), as components involved in Arabidopsis thaliana miRNA biogenesis. NOT2 was identified by its interaction with the Piwi/Ago/Zwille domain of DICER-LIKE1 (DCL1), an interaction that is conserved between rice (Oryza sativa) and Arabidopsis thaliana. Inactivation of both NOT2 genes in Arabidopsis caused severe defects in male gametophytes, and weak lines show pleiotropic defects reminiscent of miRNA pathway mutants. Impairment of NOT2s decreases the accumulation of primary miRNAs and mature miRNAs and affects DCL1 but not HYPONASTIC LEAVES1 (HYL1) localization in vivo. In addition, NOT2b protein interacts with polymerase II and other miRNA processing factors, including two cap binding proteins, CBP80/ABH1, CBP20, and SERRATE (SE). Finally, we found that the mRNA levels of some protein coding genes were also affected. Therefore, these results suggest that NOT2 proteins act as general factors to promote the transcription of protein coding as well as miRNA genes and facilitate efficient DCL1 recruitment in miRNA biogenesis.

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Section: Introductionmentioning

confidence: 99%

NOT2 Proteins Promote Polymerase II–Dependent Transcription and Interact with Multiple MicroRNA Biogenesis Factors in Arabidopsis

et al. 2013

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“…These motifs are also recognized by related MYB transcription factors, including LHY and REVEILLE8 (REV8) (Alabadí et al, 2001;Rawat et al, 2011). In the promoter of the EC gene ELF4, LHY and CCA1 bind to EEs where they act as repressors of light induction that is conferred through FHY1-FAR1 binding sites (CACCGCG) and ACGT-containing elements (Li et al, 2012). In addition to light regulation, EEs are also enriched in the promoters of coldinduced genes (Mikkelsen and Thomashow, 2009;Dong et al, 2011), and CCA1 binds directly to the promoters of C-REPEAT BINDING FACTOR genes (Dong et al, 2011), which encode transcription factors that activate a major cold-responsive regulon.…”

Section: Introductionmentioning

confidence: 99%

Evening Expression of Arabidopsis GIGANTEA Is Controlled by Combinatorial Interactions among Evolutionarily Conserved Regulatory Motifs

et al. 2014

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“…In addition to its role in activating photosynthesis, light is a direct signal that can be perceived by various photoreceptors to regulate plant development, such as leaf organogenesis and flowering transition (14)(15)(16)(17). Under dark conditions, the plant triggers skotomorphogenesis, where the cell proliferation activities in shoot and root apexes are dormant and the etiolated growth is mainly by cell elongation rather than cell division.…”

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confidence: 99%

Differential TOR activation and cell proliferation in Arabidopsis root and shoot apexes

Cai

Liu

et al. 2017

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

242

333

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The developmental plasticity of plants relies on the remarkable ability of the meristems to integrate nutrient and energy availability with environmental signals. Meristems in root and shoot apexes share highly similar molecular players but are spatially separated by soil. Whether and how these two meristematic tissues have differential activation requirements for local nutrient, hormone, and environmental cues (e.g., light) remain enigmatic in photosynthetic plants. Here, we report that the activation of root and shoot apexes relies on distinct glucose and light signals. Glucose energy signaling is sufficient to activate target of rapamycin (TOR) kinase in root apexes. In contrast, both the glucose and light signals are required for TOR activation in shoot apexes. Strikingly, exogenously applied auxin is able to replace light to activate TOR in shoot apexes and promote true leaf development. A relatively low concentration of auxin in the shoot and high concentration of auxin in the root might be responsible for this distinctive light requirement in root and shoot apexes, because light is required to promote auxin biosynthesis in the shoot. Furthermore, we reveal that the small GTPase Rho-related protein 2 (ROP2) transduces light-auxin signal to activate TOR by direct interaction, which, in turn, promotes transcription factors E2Fa,b for activating cell cycle genes in shoot apexes. Consistently, constitutively activatedROP2plants stimulate TOR in the shoot apex and cause true leaf development even without light. Together, our findings establish a pivotal hub role of TOR signaling in integrating different environmental signals to regulate distinct developmental transition and growth in the shoot and root.

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Genomic basis for light control of plant development

Cited by 47 publications

References 134 publications

NOT2 Proteins Promote Polymerase II–Dependent Transcription and Interact with Multiple MicroRNA Biogenesis Factors in Arabidopsis

NOT2 Proteins Promote Polymerase II–Dependent Transcription and Interact with Multiple MicroRNA Biogenesis Factors in Arabidopsis

Evening Expression of Arabidopsis GIGANTEA Is Controlled by Combinatorial Interactions among Evolutionarily Conserved Regulatory Motifs

Differential TOR activation and cell proliferation in Arabidopsis root and shoot apexes

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