Light-regulated Development in - AVHANDLINGAR.SE

The HDZip Class I Transcription Factors in - DiVA portal

Responsible for reducing cadmium uptake, mediated by interaction with MYB49 . of ABI5 protein, whereas afp1 mutants were hypersensitive to ABA and had increased ABI5 accumulation (Lopez-Molina et al. 2003). Most of these measurements compared seedlings that had already germinated with seeds whose germination was inhibited, such that they did not distin-guish between reduced ABI5 levels as a cause or efect of germination. These results indicate that ABI5 acts downstream of ABI3 to reactivate late embryogenesis programmes and to arrest growth of germinating embryos. Although ABI5 is consistently located in the nucleus, chromosomal immunoprecipitation (ChIP) experiments revealed that ABA increases ABI5 occupancy on the AtEm6 promoter.

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Dongqing Xu | Institutionen för biologi ABI5 (abscisic acid insensitive 5) is involved in ABA-regulated gene expression during seed development and subsequent vegetative stage and acts as the Further, we used a genetic approach taking advantage of the weak aba insensitive genes which are affected by DOG1 partly via control of ABI5 expression. av E Henriksson · 2004 · Citerat av 6 — The other cloned ABA insensitive loci, ABI3, ABI4 and ABI5, encode transcription factors of the. B3-, APETALA2- (AP2), and basic leucine zipper (bZIP) domain in the crosstalk between light and abscisic acid (ABA) network, and identified or ABA INSENSITIVE 5 (ABI5), thereby interfering with HY5 or ABI5 binding to Convergence of light and ABA signaling on the ABI5 promoter. D Xu, J Li, SN Gangappa, C Hettiarachchi, F Lin, MX Andersson, Y Jiang, PLoS Genet 10 (2), Convergence of Light and ABA signaling on the ABI5 promoter. Dongqing Xu, Jigang Li, Sreeramaiah N Gangappa et al.

Recent investigations have unravelled the importance of light–ABA interactions in postgermination development and environmental adaptability of seedlings. 2020-03-02 · Moreover, we observed that on 0.3 μM ABA, growth of abi5 pifq mutant seedlings was more resistant to ABA than that of pifq mutants, but similar to that of abi5 (Figure 4D).

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Whether ABI3 is also a direct regulator of ABI5 awaits further investigation. Together, the ABI5 promoter may represent a converging point on which the transcriptional regulators of light and ABA signaling pathways integrate the signals of both pathways by fine-tuning ABI5 expression.

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The ABI5, a bZIP transcription factor, is a key regulator in the ABA signaling pathway (Finkelstein and Lynch, 2000; Yu et al., 2015). In the presence of ABA, ABI5 levels increase drastically via a decrease in ubiquitin-meditated proteasomal degradation. Our results indicate that ABA promotes ABI5 accumulation by inducing the ubiquitination and proteasomal degradation of KEG. In the abi5‐7 mutant, ABA hypersensitivity caused by PYL11 and PYL12 overexpression was totally or partially blocked. By contrast, ABI5 regulates the expression of PYL11 and PYL12 by directly binding to their promoters. Moreover, the expression of eight other PYL s is also affected during the germination of abi5 mutants. The ABL1 deficiency mutant, abl1, shows suppressed ABA responses, and ABL1 expression in the Arabidopsis abi5 mutant rescued the ABA sensitivity. The ABL1 protein is localized to the nucleus and can directly bind ABA-responsive elements (ABREs; G-box) in vitro.

ABI5 functions in the core ABA signaling, which is composed of PYR/PYL/RCAR receptors, PP2C phosphatases and SnRK2 kinases, through the regulation ABI5 modulates seed germination via feedback regulation of the expression of the PYR/PYL/RCAR ABA receptor genes. As abscisic acid (ABA) receptors, PYR1/PYL/RCAR (PYLs) play important roles in ABA-mediated seed germination, but the regulation of PYLs in this process, especially at the transcriptional level, remains unclear. This postgermination developmental checkpoint is signaled by the stress hormone abscisic acid (ABA), which induces the expression of the bZIP transcription activator ABI5.
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Responsible for reducing cadmium uptake, mediated by interaction with MYB49 . Chromosome : 2: Locus This ABA‐mediated developmental checkpoint requires the bZIP transcription factor ABI5. Here, we used abi3‐1, which is also unable to execute this checkpoint, to investigate the relative role of ABI3 and ABI5 in this process. In wild‐type Arabidopsis plants, ABI3 expression and activity parallel those described for ABI5 following 2016-09-14 · Furthermore, 35S:ABI5 dramatically attenuated or abolished the ABA insensitivity of nf-ycT and rgl2, while abi5 35S:NF-YC9 still remained high testa and endosperm rupture rates as abi5.

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2014-02-27 · ABI5 expression is greatly reduced in the abi3 mutants, and 35S:ABI5 could rescue ABA insensitivity of abi3. Whether ABI3 is also a direct regulator of ABI5 awaits further investigation. Together, the ABI5 promoter may represent a converging point on which the transcriptional regulators of light and ABA signaling pathways integrate the signals of both pathways by fine-tuning ABI5 expression.

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Light-regulated Development in - AVHANDLINGAR.SE

However, little is known about the relationships of ABA to low CO 2 stress and the simultaneous photorespiration. ABA negatively mediates seed size by inﬂuencing the timing of endosperm cellularization. Furthermore, we demonstrated that the ABA signaling component ABI5 directly binds to the pro-moter region of SHB1 during early seed development. Our re-sults thus showed that ABA regulates early seed development by ABI5-regulated SHB1 expression. RESULTS However, ABI5 was found to modulate the PYL11‐ and PYL12‐mediated ABA response.

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This postgermination developmental checkpoint is signaled by the stress hormone abscisic acid (ABA), which induces the expression of the bZIP transcription activator ABI5. The growth arrest efficiency depends on ABI5 levels, and abi5 mutants are ABA-insensitive and … 2020-03-24 2020-03-02 Beyond germination, ABA further inhibits postgermination seedling development, which is often mediated by the transcription factor ABSCISIC ACID INSENSTIVE5 (ABI5) (Chen et al., 2020). Recent investigations have unravelled the importance of light–ABA interactions in postgermination development and environmental adaptability of seedlings. 2020-09-07 2020-03-24 However, ABI5 was found to modulate the PYL11‐ and PYL12‐mediated ABA response. In the abi5‐7 mutant, ABA hypersensitivity caused by PYL11 and PYL12 overexpression was totally or partially blocked. By contrast, ABI5 regulates the expression of PYL11 and PYL12 by directly binding to their promoters.

Together, these results establish that SIZ1-dependent sumoylation of ABI5 attenuates ABA signaling. Abscisic acid (ABA) regulates plant development and is crucial for plant responses to biotic and abiotic stresses. Studies have identified the key components of ABA signaling in Arabidopsis ( Arabidopsis thaliana ), some of which regulate ABA responses by the transcriptional regulation of downstream genes. Here, we report the functional identification of rice ( Oryza sativa ) ABI5-Like1 (ABL1 ABA INSENSITIVE 5 (ABI5) is a basic leucine zipper (bZIP) transcription factor which acts in the abscisic acid (ABA) network and is activated in response to abiotic stresses.