ATHB12, an ABA-Inducible Homeodomain-Leucine Zipper (HD-Zip) Protein of Arabidopsis, Negatively Regulates the Growth of the Inflorescence Stem by Decreasing the Expression of a Gibberellin 20-Oxidase Gene

Son, Ora; Hur, Yoon-Sun; Kim, Yun-Kyung; Lee, Hyunjung; Kim, Sunghan; Kim, Miran; Nam, Kee‐Hyun; Lee, Myung-Sok; Kim, Bu-Yong; Park, Jongbum; Park, Jungan; Lee, Sukchan; Hanada, Atsushi; Yamaguchi, Shinjiro; Lee, In‐Jung; Kim, Seoung-Ki; Yun, Dae‐Jin; Söderman, Eva; Cheon, Choong-Ill

doi:10.1093/pcp/pcq108

Cited by 83 publications

(87 citation statements)

References 47 publications

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“…(Dinneny et al, 2008). Analysis of other salt-responsive genes identified several that were also strongly dependent upon ABA signaling in the endodermis, including HOMEOBOX12 (HB12), an ABA-induced gene necessary for growth suppression during water stress ( Figure 5E) (Olsson et al, 2004;Son et al, 2010). These data show that ABA signaling is enriched in the region of the root-containing LRs and that endodermal ABA signaling is necessary for many of these responses.…”

Section: Sustained Aba Signaling Is Associated With Lr Quiescence Durmentioning

confidence: 83%

Endodermal ABA Signaling Promotes Lateral Root Quiescence during Salt Stress inArabidopsisSeedlings

et al. 2013

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The endodermal tissue layer is found in the roots of vascular plants and functions as a semipermeable barrier, regulating the transport of solutes from the soil into the vascular stream. As a gateway for solutes, the endodermis may also serve as an important site for sensing and responding to useful or toxic substances in the environment. Here, we show that high salinity, an environmental stress widely impacting agricultural land, regulates growth of the seedling root system through a signaling network operating primarily in the endodermis. We report that salt stress induces an extended quiescent phase in postemergence lateral roots (LRs) whereby the rate of growth is suppressed for several days before recovery begins. Quiescence is correlated with sustained abscisic acid (ABA) response in LRs and is dependent upon genes necessary for ABA biosynthesis, signaling, and transcriptional regulation. We use a tissue-specific strategy to identify the key cell layers where ABA signaling acts to regulate growth. In the endodermis, misexpression of the ABA insensitive1-1 mutant protein, which dominantly inhibits ABA signaling, leads to a substantial recovery in LR growth under salt stress conditions. Gibberellic acid signaling, which antagonizes the ABA pathway, also acts primarily in the endodermis, and we define the crosstalk between these two hormones. Our results identify the endodermis as a gateway with an ABA-dependent guard, which prevents root growth into saline environments.

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Section: Sustained Aba Signaling Is Associated With Lr Quiescence Durmentioning

confidence: 83%

Endodermal ABA Signaling Promotes Lateral Root Quiescence during Salt Stress inArabidopsisSeedlings

et al. 2013

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“…ATHB7 and ATHB12 are positive regulators of ABA inhibition of root and stem growth (Olsson et al, 2004). Recently, it has been demonstrated that ATHB12 inhibits stem growth by reducing GA20 oxidase (Son et al, 2010). Overexpression of another HD-Zip protein, ATHB5, enances ABA sensitivity during the germination and postgermination root growth stage, although its knockout plants do not exhibit any phenotypes (Johannesson et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the HD-Zip I subfamily is composed of 17 members, and many of them are known to modulate plant growth in response to developmental and environmental cues (Harris et al, 2011;Henriksson et al, 2005). For instance, ATHB7, ATHB12, and ATHB13 affect plant growth under abiotic stress conditions (Olsson et al, 2004;Son et al, 2010). ATHB6, ATHB5, and ATHB20 are regulators of a subset of ABA response (Barrero et al, 2010;Himmelbach et al, 2002;Johannesson et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

ATHB17 Is a Positive Regulator of Abscisic Acid Response during Early Seedling Growth

Park

Kim

Lee

et al. 2013

Molecules and Cells

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We performed activation tagging screen to isolate abscisic acid (ABA) response mutants. One of the mutants, designated ahs10 (ABA-hypersensitive10), exhibited ABA-hypersensitive phe-notypes. TAIL-PCR analysis of the mutant revealed that T-DNA was inserted in the promoter region of the Arabidopsis gene, At2g01430, which encodes a homeodomain-leucine zipper protein ATHB17. Subsequent expression analysis indicated that ATHB17 was activated in ahs10. To recapitulate the mutant phenotypes, we prepared ATHB17 OX lines and investigated their phenotypes. The results showed that ATHB17 confers ABA-hypersensitivity and drought tolerance. On the contrary, ATHB17 knockout lines were ABA-insensitive and drought-sensitive, further demonstrating that ATHB17 is involved in ABA and water-stress responses. Interestingly, the ATHB17 effect on seedling growth in the presence of ABA was observed only during the postgermination seedling establishment stage, suggesting that it functions during a narrow developmental window of early seedling growth.

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“…Arabidopsis HD-Zip I proteins consist of 17 members: AtHB1/HAT5, AtHB3/HAt7, AtHB5-7, AtHB12, AtHB13, AtHB16, AtHB20-23, AtHB40, AtHB51-54 (Ariel et al 2010;Hu et al 2012); Arabidopsis HD-ZIP II proteins consist of nine members: AtHB2/HAT4, AtHB4, HAT1-HAT3, HAT9, HAT14, HAT17, and HAT22 (Ariel et al 2010;Hu et al 2012). In summary, members of HDZip subfamilies I and II act as the integrators of development and environmental cues and endogenous hormone signal pathway to regulate targeted gene expression and plant adaptation response (Son et al 2010;Wang et al 2013c). For example, the expression of HD-Zip I and II genes was induced by the following three environmental cues: drought/salt/ABA/cold (Harris et al 2011), light stimulation (Ariel et al 2010;Harris et al 2011), and biotic stress such as Pseudomonas syringae (Dezar et al 2011).…”

Section: Electronic Supplementary Materialsmentioning

confidence: 99%

Genome-wide identification of pear HD-Zip gene family and expression patterns under stress induced by drought, salinity, and pathogen

Wang

Lin

et al. 2015

Acta Physiol Plant

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Homeodomain-leucine zipper (HD-Zip) transcription factor genes are unique in the plant kingdom. Studies have shown that HD-Zip transcription factor has four subfamilies (subfamilies I-IV), and each subfamily exerts similar or diverse functions in the growth and development as well as environmental stress responses of plants. Although a genome-wide analysis of this transcription factor has been performed in some species, systematic identification of sequences and expression patterns under biotic and abiotic stress have not been carried out in pear. In this study, we identified 52 putative HD-Zip genes within the pear genome. Based on the phylogenetic analysis, HD-Zip transcription factors were classified into four subfamilies: 18, 13, 5, and 16 members were identified separately in subfamilies I, II, III, and IV, respectively. Genes in the same subfamily shared the constituent structure and conserved motifs, thereby implying that the HDZip genes that shared similar structures may exert similar functions. Moreover, abundant stress-related and pathogenrelated cis-elements were observed in the promoter region of the pear HD-Zip I and II genes. Transcript abundance level of 20 selected HD-Zip I and II genes were analyzed by quantitative real-time RT-PCR (qRT-PCR) during the infection of Alternaria alternata, and abiotic stress conditions such as drought and salinity treatment. The results confirmed that some genes display stress-inducible and pathogen-inducible expression patterns.

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ATHB12, an ABA-Inducible Homeodomain-Leucine Zipper (HD-Zip) Protein of Arabidopsis, Negatively Regulates the Growth of the Inflorescence Stem by Decreasing the Expression of a Gibberellin 20-Oxidase Gene

Cited by 83 publications

References 47 publications

Endodermal ABA Signaling Promotes Lateral Root Quiescence during Salt Stress inArabidopsisSeedlings

Endodermal ABA Signaling Promotes Lateral Root Quiescence during Salt Stress inArabidopsisSeedlings

ATHB17 Is a Positive Regulator of Abscisic Acid Response during Early Seedling Growth

Genome-wide identification of pear HD-Zip gene family and expression patterns under stress induced by drought, salinity, and pathogen

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