The Arabidopsis ABA‐INSENSITIVE (ABI) 4 factor acts as a central transcription activator of the expression of its own gene, and for the induction of <i>ABI5</i> and <i>SBE2.2 genes</i> during sugar signaling

Bossi, Flavia; Córdoba, Elizabeth; Dupré, Patricia; Mendoza, M.; Román, Carolina San; León, Patricia

doi:10.1111/j.1365-313x.2009.03877.x

Cited by 170 publications

(168 citation statements)

References 74 publications

Supporting

Mentioning

162

Contrasting

Order By: Relevance

“…16 It was argued that ABI4 expression is limited to seed maturation and to a few days following germination. 15,18,20 On the other hand, ABI4 was reported to be expressed in shoots and roots of three-week-old plants. 7 Furthermore, we recently showed, both quantitatively and histologically, that ABI4 is expressed in mature regions of the roots at later developmental stages and that its steady-state levels are enhanced by ABA and cytokinin and reduced by auxin.…”

Section: Abi4 Expression Datamentioning

confidence: 99%

“…At these stages, ABI4 was shown to be involved in glucose signaling, 12,14,16,17 sugar signaling and response pathways, 11,13,18 ABA signaling 3,[11][12][13]15 and lipid mobilization in the embryo and germinating seeds, 21,22 as well as in chloroplast functioning and retrograde signaling. 20,23 Other studies, using older plants, showed that ABI4 is involved in nitratemodulated root branching, 24 sugar insensitivity in fully expanded leaves, 25 responses to plant pathogens and tolerance to β-amino-butyric acid (BABA)-induced water stress, [26][27][28][29] mitochondrial retrograde signaling, 30 chloroplast photosynthesis, 31,32 and modulation of hormonal control of at this developmental stage.…”

Section: Proposed Biological Roles For Abi4mentioning

confidence: 99%

“…In germinating seedlings, ABI4 was shown to be induced by external application of glucose [16][17][18][19] and mannitol 17 ABI4 was induced in ABA-treated imbibed seeds, 20 but not in germinating seedlings. 16 It was argued that ABI4 expression is limited to seed maturation and to a few days following germination.…”

Section: Abi4 Expression Datamentioning

confidence: 99%

See 2 more Smart Citations

Expression of ABSCISIC ACID INSENSITIVE 4 ( ABI4 ) in developing Arabidopsis seedlings

Shkolnik-Inbar

Bar-Zvi

2011

Plant Signaling & Behavior

View full text Add to dashboard Cite

We have recently demonstrated that the transcription factor ABSCISIC ACID INSENSITIVE 4 (ABI4) mediates abscisic acid and cytokinin inhibition of lateral root formation by reducing polar auxin transport in Arabidopsis thaliana.1 In that study, we provided a direct demonstration of ABI4 expression in phloem companion cells and parenchyma of the vascular system in the mature regions of the roots. Although also studied in mature plants, ABI4 has been studied primarily in germinating seedlings and its expression has been assumed by some researchers to be restricted to early germination stages. We thus constructed transgenic Arabidopsis plants expressing an ABI4:GUS construct, and followed ABI4 promoter activity during seedling development, focusing on the roots. Abscisic Acid Insensitive MutantsAbscisic acid insensitive (abi) mutants were identified from a selection of germinating seedlings in the presence of abscisic acid (ABA), a germination-inhibiting phytohormone.2,3 Further studies of these mutants revealed that ABI1 and ABI2 encode protein phosphatases, 4,5 ABI3, ABI4 and ABI5 encode transcription factors, 6-8 and ABI8 encodes a novel protein whose function has yet to be determined.

show abstract

Section: Abi4 Expression Datamentioning

confidence: 99%

Section: Proposed Biological Roles For Abi4mentioning

confidence: 99%

See 1 more Smart Citation

Expression of ABSCISIC ACID INSENSITIVE 4 ( ABI4 ) in developing Arabidopsis seedlings

Shkolnik-Inbar

Bar-Zvi

2011

Plant Signaling & Behavior

View full text Add to dashboard Cite

show abstract

“…ABI4 is known to bind to the ABI5 promoter and enhance its expression 33 . This information prompted us to test whether MED18 directly interacts with ABI4 to regulate ABI5 gene expression.…”

Section: Med18 Contributes To Plant Defence Against Necrotrophsmentioning

confidence: 99%

MED18 interaction with distinct transcription factors regulates multiple plant functions

et al. 2014

View full text Add to dashboard Cite

Mediator is an evolutionarily conserved transcriptional regulatory complex. Mechanisms of Mediator function are poorly understood. Here we show that Arabidopsis MED18 is a multifunctional protein regulating plant immunity, flowering time and responses to hormones through interactions with distinct transcription factors. MED18 interacts with YIN YANG1 to suppress disease susceptibility genes glutaredoxins GRX480, GRXS13 and thioredoxin TRX-h5. Consequently, yy1 and med18 mutants exhibit deregulated expression of these genes and enhanced susceptibility to fungal infection. In addition, MED18 interacts with ABA INSEN-SITIVE 4 and SUPPRESSOR OF FRIGIDA4 to regulate abscisic acid responses and flowering time, respectively. MED18 associates with the promoter, coding and terminator regions of target genes suggesting its function in transcription initiation, elongation and termination. Notably, RNA polymerase II occupancy and histone H3 lysine tri-methylation of target genes are affected in the med18 mutant, reinforcing MED18 function in different mechanisms of transcriptional control. Overall, MED18 conveys distinct cues to engender transcription underpinning plant responses.

show abstract

“…6C). GUS was expressed in the cotyledons, hypocotyls, and root tips of 60-50 7-d-old Col-0 seedlings, in accordance with the expression pattern of ABI4 (Bossi et al, 2009). On 0.1 mM N, GUS expression levels increased in cotyledons and hypocotyls.…”

Section: Abi4 Binds To the Ce1-like Elements In The Dgat1 Promotermentioning

confidence: 99%

ABI4 Activates DGAT1 Expression in Arabidopsis Seedlings during Nitrogen Deficiency

et al. 2011

View full text Add to dashboard Cite

Triacylglycerol (TAG) is the major seed storage lipid and is important for biofuel and other renewable chemical uses. Acylcoenzyme A:diacylglycerol acyltransferase1 (DGAT1) is the rate-limiting enzyme in the TAG biosynthesis pathway, but the mechanism of its regulation is unknown. Here, we show that TAG accumulation in Arabidopsis (Arabidopsis thaliana) seedlings increased significantly during nitrogen deprivation (0.1 mM nitrogen) with concomitant induction of genes involved in TAG biosynthesis and accumulation, such as DGAT1 and OLEOSIN1. Nitrogen-deficient seedlings were used to determine the key factors contributing to ectopic TAG accumulation in vegetative tissues. Under low-nitrogen conditions, the phytohormone abscisic acid plays a crucial role in promoting TAG accumulation in Arabidopsis seedlings. Yeast one-hybrid and electrophoretic mobility shift assays demonstrated that ABSCISIC ACID INSENSITIVE4 (ABI4), an important transcriptional factor in the abscisic acid signaling pathway, bound directly to the CE1-like elements (CACCG) present in DGAT1 promoters. Genetic studies also revealed that TAG accumulation and DGAT1 expression were reduced in the abi4 mutant. Taken together, our results indicate that abscisic acid signaling is part of the regulatory machinery governing TAG ectopic accumulation and that ABI4 is essential for the activation of DGAT1 in Arabidopsis seedlings during nitrogen deficiency.

show abstract

The Arabidopsis ABA‐INSENSITIVE (ABI) 4 factor acts as a central transcription activator of the expression of its own gene, and for the induction of ABI5 and SBE2.2 genes during sugar signaling

Cited by 170 publications

References 74 publications

Expression of ABSCISIC ACID INSENSITIVE 4 ( ABI4 ) in developing Arabidopsis seedlings

Expression of ABSCISIC ACID INSENSITIVE 4 ( ABI4 ) in developing Arabidopsis seedlings

MED18 interaction with distinct transcription factors regulates multiple plant functions

ABI4 Activates DGAT1 Expression in Arabidopsis Seedlings during Nitrogen Deficiency

Contact Info

Product

Resources

About