Hormone signaling in plant development

Durbak, Amanda; Yao, Huilu; McSteen, Paula

doi:10.1016/j.pbi.2011.12.004

Cited by 153 publications

(85 citation statements)

References 48 publications

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“…This raises an interesting question as to how perturbation of mitochondrial function may affect the size and activity of the root apical meristem. Plant growth is primarily determined by meristems with the plant hormone auxin orchestrating many of the underlying processes (Durbak et al, 2012). It has been shown that perturbation of mitochondrial function may negatively affect auxin signaling (Kerchev et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

The SLOW GROWTH3 Pentatricopeptide Repeat Protein Is Required for the Splicing of Mitochondrial NADH Dehydrogenase Subunit7 Intron 2 in Arabidopsis

et al. 2015

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Mitochondria play an important role in maintaining metabolic and energy homeostasis in the cell. In plants, impairment in mitochondrial functions usually has detrimental effects on growth and development. To study genes that are important for plant growth, we have isolated a collection of slow growth (slo) mutants in Arabidopsis (Arabidopsis thaliana). One of the slo mutants, slo3, has a significant reduction in mitochondrial complex I activity. The slo3 mutant has a four-nucleotide deletion in At3g61360 that encodes a pentatricopeptide repeat (PPR) protein. The SLO3 protein contains nine classic PPR domains belonging to the P subfamily. The small deletion in the slo3 mutant changes the reading frame and creates a premature stop codon in the first PPR domain. We demonstrated that the SLO3-GFP is localized to the mitochondrion. Further analysis of mitochondrial RNA metabolism revealed that the slo3 mutant was defective in splicing of NADH dehydrogenase subunit7 (nad7) intron 2. This specific splicing defect led to a dramatic reduction in complex I activity in the mutant as revealed by blue native gel analysis. Complementation of slo3 by 35S:SLO3 or 35S:SLO3-GFP restored the splicing of nad7 intron 2, the complex I activity, and the growth defects of the mutant. Together, these results indicate that the SLO3 PPR protein is a splicing factor of nad7 intron 2 in Arabidopsis mitochondria.

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Section: Discussionmentioning

confidence: 99%

The SLOW GROWTH3 Pentatricopeptide Repeat Protein Is Required for the Splicing of Mitochondrial NADH Dehydrogenase Subunit7 Intron 2 in Arabidopsis

et al. 2015

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“…Auxin-cytokinin crosstalk plays an important role in the regulation of root meristem activities (Müller and Sheen, 2008;Benková and Hejátko, 2009;Su et al, 2011;Durbak et al, 2012). Recent progress has revealed that the balance between cell differentiation and division, which is necessary for controlling root meristem size and root growth, is regulated by antagonistic action of cytokinin and auxin in Arabidopsis and rice (Dello Ioio et al, 2007;Kitomi et al, 2011b;Gao et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

The Interaction between Rice ERF3 and WOX11 Promotes Crown Root Development by Regulating Gene Expression Involved in Cytokinin Signaling

et al. 2015

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Crown roots are the main components of the fibrous root system in rice (Oryza sativa). WOX11, a WUSCHEL-related homeobox gene specifically expressed in the emerging crown root meristem, is a key regulator in crown root development. However, the nature of WOX11 function in crown root development has remained elusive. Here, we identified a rice AP2/ERF protein, ERF3, which interacts with WOX11 and was expressed in crown root initials and during crown root growth. Functional analysis revealed that ERF3 was essential for crown root development and acts in auxin-and cytokinin-responsive gene expression. Downregulation of ERF3 in wox11 mutants produced a more severe root phenotype. Also, increased expression of ERF3 could partially complement wox11, indicating that the two genes functioned cooperatively to regulate crown root development. ERF3 and WOX11 shared a common target, the cytokinin-responsive gene RR2. The expression of ERF3 and WOX11 only partially overlapped, underlining a spatio-temporal control of RR2 expression and crown root development. Furthermore, ERF3-regulated RR2 expression was involved in crown root initiation, while the ERF3/WOX11 interaction likely repressed RR2 during crown root elongation. These results define a mechanism regulating gene expression involved in cytokinin signaling during different stages of crown root development in rice.

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“…parviglumis), its wild ancestor. While there are multiple genetic pathways necessary for suppression of axillary bud production in plants (3)(4)(5), in maize, this process has been found to operate through a specialized pathway mediated by the teosinte branched1 (tb1) locus first identified by Charles Burnham over 50 y ago (6). tb1 loss of function mutants overproduce tillers and have long aerial branches tipped by male tassels that replace the normally female ears (7), indicating that it functions as a repressor of both axillary bud growth and inflorescence sexual fate (8).…”

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confidence: 99%

Ideal crop plant architecture is mediated by tassels replace upper ears1, a BTB/POZ ankyrin repeat gene directly targeted by TEOSINTE BRANCHED1

Dong

Unger-Wallace

et al. 2017

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

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Axillary branch suppression is a favorable trait bred into many domesticated crop plants including maize compared with its highly branched wild ancestor teosinte. Branch suppression in maize was achieved through selection of a gain of function allele of the teosinte branched1 (tb1) transcription factor that acts as a repressor of axillary bud growth. Previous work indicated that other loci may function epistatically with tb1 and may be responsible for some of its phenotypic effects. Here, we show that tb1 mediates axillary branch suppression through direct activation of the tassels replace upper ears1 (tru1) gene that encodes an ankyrin repeat domain protein containing a BTB/POZ motif necessary for protein-protein interactions. The expression of TRU1 and TB1 overlap in axillary buds, and TB1 binds to two locations in the tru1 gene as shown by chromatin immunoprecipitation and gel shifts. In addition, nucleotide diversity surveys indicate that tru1, like tb1, was a target of selection. In modern maize, TRU1 is highly expressed in the leaf trace vasculature of axillary internodes, while in teosinte, this expression is highly reduced or absent. This increase in TRU1 expression levels in modern maize is supported by comparisons of relative protein levels with teosinte as well as by quantitative measurements of mRNA levels. Hence, a major innovation in creating ideal maize plant architecture originated from ectopic overexpression of tru1 in axillary branches, a critical step in mediating the effects of domestication by tb1.A xillary meristems are produced at the base of each new leaf and can have different fates depending on their positions within the plant. In maize, those found aboveground have a reproductive fate, while those found at the base of the plant can become long branches that are vegetative clones of the main shoot and are called tillers. These extra branches often compete for valuable resources such as light (1) and can have a negative impact on plant growth if produced in excess. Indeed, suppression of axillary branching through an increase in apical dominance is a commonly bred trait among many domesticated crop plants (2), including maize (Zea mays ssp. mays), which was domesticated from teosinte (Z. mays ssp. parviglumis), its wild ancestor. While there are multiple genetic pathways necessary for suppression of axillary bud production in plants (3-5), in maize, this process has been found to operate through a specialized pathway mediated by the teosinte branched1 (tb1) locus first identified by Charles Burnham over 50 y ago (6). tb1 loss of function mutants overproduce tillers and have long aerial branches tipped by male tassels that replace the normally female ears (7), indicating that it functions as a repressor of both axillary bud growth and inflorescence sexual fate (8). Previous quantitative trait locus studies mapping the genetic basis for differences in plant morphology between maize and teosinte showed that selection at the tb1 locus was responsible for the increase in apical dominance foun...

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Hormone signaling in plant development

Cited by 153 publications

References 48 publications

The SLOW GROWTH3 Pentatricopeptide Repeat Protein Is Required for the Splicing of Mitochondrial NADH Dehydrogenase Subunit7 Intron 2 in Arabidopsis

The SLOW GROWTH3 Pentatricopeptide Repeat Protein Is Required for the Splicing of Mitochondrial NADH Dehydrogenase Subunit7 Intron 2 in Arabidopsis

The Interaction between Rice ERF3 and WOX11 Promotes Crown Root Development by Regulating Gene Expression Involved in Cytokinin Signaling

Ideal crop plant architecture is mediated by tassels replace upper ears1, a BTB/POZ ankyrin repeat gene directly targeted by TEOSINTE BRANCHED1

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