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The Arabidopsis abscisic acid (ABA)-insensitive abi5 mutants have pleiotropic defects in ABA response, including decreased sensitivity to ABA inhibition of germination and altered expression of some ABA-regulated genes. ABI5 is a basic leucine zipper (bZIP) TF that plays a crucial role in ABA signaling-mediated seed germination, chlorophyll catabolism, leaf senescence, and abiotic stress adaptation (Kanai et al., 2010; Sakuraba et al., 2014; Skubacz et al., 2016; Zhao et al., 2020). ABA Insensitive 5 (ABI5) is a basic leucine zipper transcription factor that plays a key role in the regulation of seed germination and early seedling growth in the presence of ABA and abiotic stresses. 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.
Together, our study indicates that BBX21 coordinates with HY5 and ABI5 on the ABI5 promoter and that these transcriptional regulators work in concert to integrate light and ABA signaling in The Arabidopsis abscisic acid (ABA)–insensitive abi5 mutants have pleiotropic defects in ABA response, including decreased sensitivity to ABA inhibition of germination and altered expression of some ABA-regulated genes. We isolated the ABI5 gene by using a positional cloning approach and found that it encodes a member of the basic leucine zipper transcription factor family. The previously Genetic analysis shows that abi5-4 is epistatic to afp-1, indicating the ABA hypersensitivity of afp mutants requires ABI5. Proteasome inhibitor studies show that ABI5 stability is regulated by ABA through ubiquitin-related events. When expressed together, AFP and ABI5 are colocalized in nuclear bodies, which also contain COP1, a RING motif Comparison of seed and ABA-inducible vegetative gene expression in wild-type and abi5-1 plants indicates that ABI5 regulates a subset of late embryogenesis-abundant genes during both developmental stages.
Our re-sults thus showed that ABA regulates early seed development by ABI5-regulated SHB1 expression. RESULTS 2020-07-29 2011-07-01 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.
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Sumoylated at Lys-391 by SIZ1. Sumoylation protects ABI5 from proteasome degradation, attenuating ABA signaling and sensitivity to ABA… 2019-08-09 Comparison of seed and ABA-inducible vegetative gene expression in wild-type and abi5-1 plants indicates that ABI5 regulates a subset of late embryogenesis-abundant genes during both developmental stages. Responsible for reducing cadmium uptake, mediated by interaction with MYB49 .
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By contrast, ABI5 regulates the expression of PYL11 and PYL12 by directly binding to their promoters.
However, the precise role of barley (Hordeum vulgare) ABI5 in ABA signaling and its function under stress remains elusive. Here, we show that HvABI5 is involved in ABA-dependent regulation of barley response to drought
2009-03-31
The Arabidopsis abscisic acid response gene ABI5 encodes a basic leucine zipper transcription factor. The Arabidopsis abscisic acid (ABA)-insensitive abi5 mutants have pleiotropic defects in ABA response, including decreased sensitivity to ABA inhibition of germination and altered expression of some ABA-regulated genes. ABI5 is a basic leucine zipper (bZIP) TF that plays a crucial role in ABA signaling-mediated seed germination, chlorophyll catabolism, leaf senescence, and abiotic stress adaptation (Kanai et al., 2010; Sakuraba et al., 2014; Skubacz et al., 2016; Zhao et al., 2020). ABA Insensitive 5 (ABI5) is a basic leucine zipper transcription factor that plays a key role in the regulation of seed germination and early seedling growth in the presence of ABA and abiotic stresses.
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Components of auxin, cytokinin, gibberellic acid, jasmonate and brassinosteroid signaling and metabolism pathways were shown to take part in ABI5 regulation and/or to be regulated by ABI5…
Ubiquitinated. AFP1, KEG and RPN10 mediate its proteasome-dependent degradation. Its stability or degradation plays a central role in abscisic acid response.
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We hypothesized that ABI5 negative regulator of ABA signaling that promotes ABI5 degradation during seed germination. Over-expression of AFP1 enhances tolerance to ABA and reduces ABI5 accumulation, whereas afp1 mutants are sensitive to ABA and have high levels of ABI5 (Lopez-Molinaetal.,2003).TherearethreeAFP1homologs(i.e. AFP2, AFP3, and AFP4) in the Arabidopsis genome, Correspondingly, the seed germination from two independent gim1 ABI5‐5 hybrid lines, gim1 ABI5‐5(A) and gim1 ABI5‐5(E), showed hypersensitivity to ABA .
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Our findings reveal a novel transcriptional switch, composed of JMJ17–WRKY40 and HY5–ABI5 modules, which regulates the ABA response during seed germination and seedling development in Arabidopsis.