The bZIP transcription factor OsABF1 is an ABA responsive element binding factor that enhances abiotic stress signaling in rice

Hossain, Md. Amir; Lee, Yong-Joo; Cho, Jung‐Il; Ahn, Curie; Lee, Sang‐Kyu; Jeon, Jong‐Seong; Kang, Hun; Lee, Choon-Hwan; An, Gynheung; Park, Phun Bum

doi:10.1007/s11103-009-9592-9

Cited by 237 publications

(151 citation statements)

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“…Drought stress induces mRNA accumulation of these transcription factors in an abscisic acid (ABA)-dependent or -independent manner, regulating expression of their direct target genes that encode late embryogenesis abundant (LEA) proteins, antioxidant enzymes, osmolyte biosynthesis enzymes, chaperones, and transporters. Rice (Os) orthologs of these Arabidopsis transcription factors, such as Os DREB1A, Os DREB2B, Os ABF1, and Os NAC6, induce similar stress-inducible genes, and their ectopic expression increases drought tolerance in rice (Dubouzet et al, 2003;Nakashima et al, 2007;Amir Hossain et al, 2010;Matsukura et al, 2010), indicating that Arabidopsis and rice share common transcriptional networks that coordinate drought response and tolerance mechanisms.…”

Section: Introductionmentioning

confidence: 99%

“…Each stress stimulates accumulation of ABA in vegetative tissue, resulting in stomatal closure, stress-inducible gene expression, and metabolic adjustment (Zhu, 2002;Seki et al, 2007). It is well known that transcription factors such as DREB1/CBF, DREB2, AREB/ABF, and NAC regulate expression of genes associated with acclimation to osmotic stress (Dubouzet et al, 2003;Nakashima et al, 2007;Amir Hossain et al, 2010;Matsukura et al, 2010). Overexpression of each of these genes enhances tolerance to multiple stresses, including drought, salinity, and low temperature in Arabidopsis and rice.…”

Section: Introductionmentioning

confidence: 99%

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The Submergence Tolerance Regulator SUB1A Mediates Crosstalk between Submergence and Drought Tolerance in Rice

2010

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Submergence and drought are major constraints to rice (Oryza sativa) production in rain-fed farmlands, both of which can occur sequentially during a single crop cycle. SUB1A, an ERF transcription factor found in limited rice accessions, dampens ethylene production and gibberellic acid responsiveness during submergence, economizing carbohydrate reserves and significantly prolonging endurance. Here, we evaluated the functional role of SUB1A in acclimation to dehydration. Comparative analysis of genotypes with and without SUB1A revealed that SUB1A enhanced recovery from drought at the vegetative stage through reduction of leaf water loss and lipid peroxidation and increased expression of genes associated with acclimation to dehydration. Overexpression of SUB1A augmented ABA responsiveness, thereby activating stressinducible gene expression. Paradoxically, vegetative tissue undergoes dehydration upon desubmergence even though the soil contains sufficient water, indicating that leaf desiccation occurs in the natural progression of a flooding event.Desubmergence caused the upregulation of gene transcripts associated with acclimation to dehydration, with higher induction in SUB1A genotypes. SUB1A also restrained accumulation of reactive oxygen species (ROS) in aerial tissue during drought and desubmergence. Consistently, SUB1A increased the abundance of transcripts encoding ROS scavenging enzymes, resulting in enhanced tolerance to oxidative stress. Therefore, in addition to providing robust submergence tolerance, SUB1A improves survival of rapid dehydration following desubmergence and water deficit during drought.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Submergence Tolerance Regulator SUB1A Mediates Crosstalk between Submergence and Drought Tolerance in Rice

2010

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“…Generally, subgroup A bZIP transcription factors need SnRKs to fully activate their transcriptional activation activity (Kagaya et al, 2002;Kobayashi et al, 2005;Chae et al, 2007;Fujii et al, 2007;Yoshida et al, 2010;Kim et al, 2015). In rice, 11 subgroup A bZIP transcription factors have been identified, and 6 of them have been associated with diverse biological functions (Hobo et al, 1999;Zou et al, 2007;Xiang et al, 2008;Zou et al, 2008;Lu et al, 2009;Amir Hossain et al, 2010;Hossain et al, 2010;Yang et al, 2011;Tang et al, 2012). Transgenic plants with overexpressed OsbZIP23 show significantly improved drought and salt tolerance and sensitivity to ABA (Xiang et al, 2008).…”

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confidence: 99%

Feedback Regulation of ABA Signaling and Biosynthesis by a bZIP Transcription Factor Targets Drought-Resistance-Related Genes

et al. 2016

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The OsbZIP23 transcription factor has been characterized for its essential role in drought resistance in rice (Oryza sativa), but the mechanism is unknown. In this study, we first investigated the transcriptional activation of OsbZIP23. A homolog of SnRK2 protein kinase (SAPK2) was found to interact with and phosphorylate OsbZIP23 for its transcriptional activation. SAPK2 also interacted with OsPP2C49, an ABI1 homolog, which deactivated the SAPK2 to inhibit the transcriptional activation activity of OsbZIP23. Next, we performed genome-wide identification of OsbZIP23 targets by immunoprecipitation sequencing and RNA sequencing analyses in the OsbZIP23-overexpression, osbzip23 mutant, and wild-type rice under normal and drought stress conditions. OsbZIP23 directly regulates a large number of reported genes that function in stress response, hormone signaling, and developmental processes. Among these targets, we found that OsbZIP23 could positively regulate OsPP2C49, and overexpression of OsPP2C49 in rice resulted in significantly decreased sensitivity of the abscisic acid (ABA) response and rapid dehydration. Moreover, OsNCED4 (9-cis-epoxycarotenoid dioxygenase4), a key gene in ABA biosynthesis, was also positively regulated by OsbZIP23. Together, our results suggest that OsbZIP23 acts as a central regulator in ABA signaling and biosynthesis, and drought resistance in rice.

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“…The DNA binding region preferentially interacts with ABA-responsive elements (ABREs), which are predominantly located in the promoter regions of ABAinducible genes (Jakoby et al, 2002;Nijhawan et al, 2008). A great deal of genetic evidence shows that these ABRE-associated bZIP TFs are involved in drought tolerance response (Kang et al, 2002;Oh et al, 2005;Xiang et al, 2008;Lu et al, 2009;Hossain et al, 2010aHossain et al, , 2010bTang et al, 2012). Until now, none had been shown to regulate rice floral transition in response to drought stress.…”

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confidence: 99%

A Drought-Inducible Transcription Factor Delays Reproductive Timing in Rice

Zhang

Zhao

et al. 2016

Plant Physiol.

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The molecular mechanisms underlying photoperiod or temperature control of flowering time have been recently elucidated, but how plants regulate flowering time in response to other external factors, such as water availability, remains poorly understood. Using a large-scale Hybrid Transcription Factor approach, we identified a bZIP transcriptional factor, O. sativa ABA responsive element binding factor 1 (OsABF1), which acts as a suppressor of floral transition in a photoperiod-independent manner. Simultaneous knockdown of both OsABF1 and its closest homologous gene, OsbZIP40, in rice (Oryza sativa) by RNA interference results in a significantly earlier flowering phenotype. Molecular and genetic analyses demonstrate that a drought regime enhances expression of the OsABF1 gene, which indirectly suppresses expression of the Early heading date 1 (Ehd1) gene that encodes a key activator of rice flowering. Furthermore, we identified a drought-inducible gene named OsWRKY104 that is under the direct regulation of OsABF1. Overexpression of OsWRKY104 can suppress Ehd1 expression and confers a later flowering phenotype in rice. Together, these findings reveal a novel pathway by which rice modulates heading date in response to the change of ambient water availability.Flowering time (or heading date) and drought resistance are two major yield traits in crops, especially rice (Oryza sativa). As global climatic change looms, drought has become the biggest abiotic stress to limit crop yields. Breeders have capitalized on naturally occurring genetic variations to improve or maintain crop yield in times or areas of drought by different strategies (Eisenstein, 2013). Manipulation of floral transition has been a promising way to maximize crop yield during dry periods. This strategy has been successful due to extensive identification of genetic loci and elucidation of molecular mechanisms that control flowering time under diverse or unpredictable environments.Heading date in rice is influenced by many environmental cues such as day length (photoperiod), temperature, nutrition, and water availability. Molecular mechanisms that underlie photoperiod regulation of flowering time have already been characterized, probably because day length is more predictable than other environmental factors during seasonal changes. Rice is a facultative short-day plant that flowers earlier in short days (SDs) than in long days (LDs). Heading date 3a (Hd3a) and RICE FLOWERING LOCUS T1 (RFT1) are two paralogous genes in rice encoding "florigen" molecules expressed in the phloem of leaves and transported to the shoot apical meristem to promote flowering (Tamaki et al., 2007;

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The bZIP transcription factor OsABF1 is an ABA responsive element binding factor that enhances abiotic stress signaling in rice

Cited by 237 publications

References 55 publications

The Submergence Tolerance Regulator SUB1A Mediates Crosstalk between Submergence and Drought Tolerance in Rice

The Submergence Tolerance Regulator SUB1A Mediates Crosstalk between Submergence and Drought Tolerance in Rice

Feedback Regulation of ABA Signaling and Biosynthesis by a bZIP Transcription Factor Targets Drought-Resistance-Related Genes

A Drought-Inducible Transcription Factor Delays Reproductive Timing in Rice

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