Induction of a homeodomain–leucine zipper gene by auxin is inhibited by cytokinin in Arabidopsis roots

Son, Ora; Cho, Hee‐Yeon; Kim, Miran; Lee, Hyosoo; Lee, Myeong‐Sok; Song, Eun-Sook; Park, Jong Hoon; Nam, Kyung Hee; Chun, Jong-Yoon; Kim, Ho-Jung; Hong, Soon‐Kwan; Chung, Yong-Yoon; Hur, Cheol-Goo; Cho, Hyung-Taeg; Cheon, Choong-Ill

doi:10.1016/j.bbrc.2004.11.014

Cited by 29 publications

(33 citation statements)

References 32 publications

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“…The d genes ATHB21, -40, and -53, like ATHB7 and -12, show an increase in transcript levels in response to ABA or water deficit treatments. In addition, ATHB40 and -53, but not ATHB21, are reported to be regulated by auxin (Son et al, 2005). The ABA and water deficit stress response is supported by available microarray data using the Genevestigator database (Zimmermann et al, 2004).…”

Section: Discussionmentioning

confidence: 88%

Homeodomain Leucine Zipper Class I Genes in Arabidopsis. Expression Patterns and Phylogenetic Relationships

et al. 2005

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Members of the homeodomain leucine zipper (HDZip) family of transcription factors are present in a wide range of plants, from mosses to higher plants, but not in other eukaryotes. The HDZip genes act in developmental processes, including vascular tissue and trichome development, and several of them have been suggested to be involved in the mediation of external signals to regulate plant growth. The Arabidopsis (Arabidopsis thaliana) genome contains 47 HDZip genes, which, based on sequence criteria, have been grouped into four different classes: HDZip I to IV. In this article, we present an overview of the class I HDZip genes in Arabidopsis. We describe their expression patterns, transcriptional regulation properties, duplication history, and phylogeny. The phylogeny of HDZip class I genes is supported by data on the duplication history of the genes, as well as the intron/exon patterning of the HDZip-encoding motifs. The HDZip class I genes were found to be widely expressed and partly to have overlapping expression patterns at the organ level. Further, abscisic acid or water deficit treatments and different light conditions affected the transcript levels of a majority of the HDZip I genes. Within the gene family, our data show examples of closely related HDZip genes with similarities in the function of the gene product, but a divergence in expression pattern. In addition, six HDZip class I proteins tested were found to be activators of gene expression. In conclusion, several HDZip I genes appear to regulate similar cellular processes, although in different organs or tissues and in response to different environmental signals.

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Section: Discussionmentioning

confidence: 88%

Homeodomain Leucine Zipper Class I Genes in Arabidopsis. Expression Patterns and Phylogenetic Relationships

et al. 2005

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“…There are rare cases in which activation of one hormonal pathway might branch and stimulate transduction component of another pathway (Hass et al 2004). Hormonal signalling pathways might also differentially regulate expression or activity of common target gene (Chilley et al 2006;Son et al 2005). Several other modes of hormonal interactions could be predicted.…”

Section: Resultsmentioning

confidence: 98%

“…Expression of several other genes was found to be under control of auxin and cytokinin. For example, transcription of the rootspecific putative homeobox gene ATHB53 is differentially regulated by auxin and CK (Son et al 2005), and interestingly, CK regulates also expression of genes of the auxin signalling pathway (SHY2-2/IAA3, AXR3/IAA17 or SAUR-AC1) (Rashotte et al 2005).…”

Section: Cytokinin: Antagonist In Rootmentioning

confidence: 99%

Hormone interactions at the root apical meristem

Benková¹,

2008

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Plants exhibit an amazing developmental flexibility. Plant embryogenesis results in the establishment of a simple apical-basal axis represented by apical shoot and basal root meristems. Later, during postembryonic growth, shaping of the plant body continues by the formation and activation of numerous adjacent meristems that give rise to lateral shoot branches, leaves, flowers, or lateral roots. This developmental plasticity reflects an important feature of the plant's life strategy based on the rapid reaction to different environmental stimuli, such as temperature fluctuations, availability of nutrients, light or water and response resulting in modulation of developmental programs. Plant hormones are important endogenous factors for the integration of these environmental inputs and regulation of plant development. After a period of studies focused primarily on single hormonal pathways that enabled us to understand the hormone perception and signal transduction mechanisms, it became obvious that the developmental output mediated by a single hormonal pathway is largely modified through a whole network of interactions with other hormonal pathways. In this review, we will summarize recent knowledge on hormonal networks that regulate the development and growth of root with focus on the hormonal interactions that shape the root apical meristem.

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“…2B) indicate that gt1 is a class I HD-Zip, belonging to the ∂-subfamily (48). Although no Arabidopsis member of this subfamily has been functionally characterized, some of them are regulated by the hormones abscisic acid and auxin (48,49). Within the grasses, there are two paralogous clades of class I HD-Zips in the ∂-subfamily, one containing gt1 and the other containing the barley (H. vulgare) six-rowed spike 1 (Vrs1) gene that controls spikelet row number.…”

Section: Resultsmentioning

confidence: 99%

grassy tillers1 promotes apical dominance in maize and responds to shade signals in the grasses

Whipple

Kebrom

Weber

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

228

227

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The shape of a plant is largely determined by regulation of lateral branching. Branching architecture can vary widely in response to both genotype and environment, suggesting regulation by a complex interaction of autonomous genetic factors and external signals. Tillers, branches initiated at the base of grass plants, are suppressed in response to shade conditions. This suppression of tiller and lateral branch growth is an important trait selected by early agriculturalists during maize domestication and crop improvement. To understand how plants integrate external environmental cues with endogenous signals to control their architecture, we have begun a functional characterization of the maize mutant grassy tillers1 (gt1). We isolated the gt1 gene using positional cloning and found that it encodes a class I homeodomain leucine zipper gene that promotes lateral bud dormancy and suppresses elongation of lateral ear branches. The gt1 expression is induced by shading and is dependent on the activity of teosinte branched1 (tb1), a major domestication locus controlling tillering and lateral branching. Interestingly, like tb1, gt1 maps to a quantitative trait locus that regulates tillering and lateral branching in maize and shows evidence of selection during maize domestication. Branching and shade avoidance are both of critical agronomic importance, but little is known about how these processes are integrated. Our results indicate that gt1 mediates the reduced branching associated with the shade avoidance response in the grasses. Furthermore, selection at the gt1 locus suggests that it was involved in improving plant architecture during the domestication of maize.

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Induction of a homeodomain–leucine zipper gene by auxin is inhibited by cytokinin in Arabidopsis roots

Cited by 29 publications

References 32 publications

Homeodomain Leucine Zipper Class I Genes in Arabidopsis. Expression Patterns and Phylogenetic Relationships

Homeodomain Leucine Zipper Class I Genes in Arabidopsis. Expression Patterns and Phylogenetic Relationships

Hormone interactions at the root apical meristem

grassy tillers1 promotes apical dominance in maize and responds to shade signals in the grasses

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