Floral Reversion in Arabidopsis suecica Is Correlated with the Onset of Flowering and Meristem Transitioning

Asbe, Amelia; Matsushita, Starr C.; Gordon, Spencer; Kirkpatrick, H. Elizabeth; Madlung, Andreas

doi:10.1371/journal.pone.0127897

Cited by 13 publications

(14 citation statements)

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“…These mutant phenotypes can be interpreted as heterochronic effects, and the delayed or abolished transition from spikelet meristem or IM to FM produces ectopic bracts or leaf-like organs. The concept of the floral transition as a multidimensional process involving different spatiotemporal components is underlined by uncoupling of the floral transition and bolting by non-permissive conditions (Pouteau and Albertini 2011), which also causes the floral reversion of incompletely committed meristems in many species (Asbe et al 2015). In Petunia, floral reversion has revealed a continuum of variation at the levels of meristem identity, primordium initiation and floral organ identity (Pouteau et al 1998).…”

Section: Stereotypy In Wild Type Floral Organ Number Is Initially Unsmentioning

confidence: 99%

A phylogenetically conserved APETALA2/ETHYLENE RESPONSE FACTOR, ERF12, regulates Arabidopsis floral development

Chandler

Werr

2019

Plant Mol Biol

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Key message Arabidopsis ETHYLENE RESPONSE FACTOR12 (ERF12), the rice MULTIFLORET SPIKELET1 orthologue pleiotropically affects meristem identity, floral phyllotaxy and organ initiation and is conserved among angiosperms. Abstract Reproductive development necessitates the coordinated regulation of meristem identity and maturation and lateral organ initiation via positive and negative regulators and network integrators. We have identified ETHYLENE RESPONSE FACTOR12 (ERF12) as the Arabidopsis orthologue of MULTIFLORET SPIKELET1 (MFS1) in rice. Loss of ERF12 function pleiotropically affects reproductive development, including defective floral phyllotaxy and increased floral organ merosity, especially supernumerary sepals, at incomplete penetrance in the first-formed flowers. Wildtype floral organ number in early formed flowers is labile, demonstrating that floral meristem maturation involves the stabilisation of positional information for organogenesis, as well as appropriate identity. A subset of erf12 phenotypes partly defines a narrow developmental time window, suggesting that ERF12 functions heterochronically to fine-tune stochastic variation in wild type floral number and similar to MFS1, promotes meristem identity. ERF12 expression encircles incipient floral primordia in the inflorescence meristem periphery and is strong throughout the floral meristem and intersepal regions. ERF12 is a putative transcriptional repressor and genetically opposes the function of its relatives DORNRÖSCHEN, DORNRÖSCHEN-LIKE and PUCHI and converges with the APETALA2 pathway. Phylogenetic analysis suggests that ERF12 is conserved among all eudicots and appeared in angiosperm evolution concomitant with the generation of floral diversity.

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Section: Stereotypy In Wild Type Floral Organ Number Is Initially Unsmentioning

confidence: 99%

A phylogenetically conserved APETALA2/ETHYLENE RESPONSE FACTOR, ERF12, regulates Arabidopsis floral development

Chandler

Werr

2019

Plant Mol Biol

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“…A. suecica, native to Scandinavia, is a natural allopolyploid derived from the hybridization of A. thaliana and A. arenosa, which most likely occurred an estimated 16,000 years ago [ 30 ]. Phenotypic analyses of accessions collected throughout Sweden and Finland showed that populations differ from each other in several morphometric traits, flowering time, the occurrence of certain floral abnormalities, and the genomic location of the DNA transposon Sunfish [ 31 , 32 ]. It is, however, not known to date how much variation on the transcriptome level has accumulated between populations in this relatively recent allopolyploid.…”

Section: Introductionmentioning

confidence: 99%

Natural variation in stress response gene activity in the allopolyploid Arabidopsis suecica

et al. 2017

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BackgroundAllopolyploids contain genomes composed of more than two complete sets of chromosomes that originate from at least two species. Allopolyploidy has been suggested as an important evolutionary mechanism that can lead to instant speciation. Arabidopsis suecica is a relatively recent allopolyploid species, suggesting that its natural accessions might be genetically very similar to each other. Nonetheless, subtle phenotypic differences have been described between different geographic accessions of A. suecica grown in a common garden. ResultsTo determine the degree of genomic similarity between different populations of A. suecica, we obtained transcriptomic sequence, quantified SNP variation within the gene space, and analyzed gene expression levels genome-wide from leaf material grown in controlled lab conditions. Despite their origin from the same progenitor species, the two accessions of A. suecica used in our study show genomic and transcriptomic variation. We report significant gene expression differences between the accessions, mostly in genes with stress-related functions. Among the differentially expressed genes, there are a surprising number of homoeologs coordinately regulated between sister accessions.ConclusionsMany of these homoeologous genes and other differentially expressed genes affect transpiration and stomatal regulation, suggesting that they might be involved in the establishment of the phenotypic differences between the two accessions.Electronic supplementary materialThe online version of this article (doi:10.1186/s12864-017-4067-x) contains supplementary material, which is available to authorized users.

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“…Besides over expression of AGL24 also causes ectopic inflorescence development [16]. Floral reversion was also observed in the natural allopolyploid Arabidopsis suecica, in which abnormal expression of floral genes, including AGL24, AP1, SVP and SOC1 was detected [17,18]. Unlike Arabidopsis, LFY, TFL1 and AG in Impatiens balsamina seemed not to be involved in terminal flowering and floral determinacy [19].…”

Section: Introductionmentioning

confidence: 93%

SLGT11 Controls Floral Organ Patterning and Floral Meristem Termination in Tomato

Yang

touqeer

et al. 2020

Preprint

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Background: Flower development affects fruit production directly in tomato. Despite the framework mediated by ABC genes have been established in Arabidopsis, the spatiotemporal precision of floral development in tomato has not been well examined.Results: Here, we analyzed a novel tomato mutant in which the normal development of stamens and carpels failed, resulting in ectopic formation of floral and shoot apical meristem in the fourth whorl position, which later developed into stem-and leaf-like structures. Using bulked segregant analysis (BSA), we assigned the causal mutation to the gene SLGT11 that encodes a transcription factor belonging to Trihelix gene family. Further RNAi silencing of SLGT11 verified the defective phenotypes of slf mutant. The failed termination of floral meristem and the occurrence of floral reversion in slf mutant indicate that SLGT11 functions as a non-canonical C type gene. Furthermore, we found that the defects in slf were substantially enhanced at higher temperature, with petals transformed into sepals, all stamens disappeared, and increased frequency of ectopic floral meristem. Conclusions: Together with the spatiotemporal expression pattern, we suggest that SLGT11 functions in floral organ patterning and termination of floral meristem identity in tomato. Arabidopsis, the activity of floral meristem is maintained through the WUSCHEL-CLAVATA (WUS-CLV) signaling pathway until carpel primordial is initiated [1]. In later stage of flower development (starting from stage), AGAMOUS (AG) represses WUS through activating KNUCKLES (KNU) directly in floral meristem to ensure the correct progression of further floral development [2, 3]. A large number of regulators such as PAN, ULT1, RBL, SQN, SUP, SEP3, ARF3, MIF and CRC, participate in floral regulation by direct or indirect regulation of WUS activity [4-13]. These regulators form the complex network interplaying with plant hormones during the floral development. It was found that ARF3 is regulated by auxin, AG and AP2 in developing flowers, which represses cytokinin activity to inhibit 3 WUS [14]. The mechanisms of floral development could also be conserved among species. For example, it was found KNU interacts with MIF to regulate WUS expression and this mechanism is conservative between Arabidopsis and tomato [12]. Flower reversion is an unusual process in which the committed flower development is reverted back to vegetative growth, resulting in outgrowth of leaf or inflorescence structures emerged from the first flower [1]. This phenomenon is often related to varied environmental conditions, such as temperature and photoperiod. For example, such floral reversion was observed in lfy-6 and ag-1 mutants of Arabidopsis grown in short days [15]. Besides over expression of AGL24 also causes ectopic inflorescence development [16]. Floral reversion was also observed in the natural allopolyploid Arabidopsis suecica, in which abnormal expression of floral genes, including AGL24, AP1, SVP and SOC1 was detected [17, 18]. Unlike Arabidopsis, LFY, TFL1...

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Floral Reversion in Arabidopsis suecica Is Correlated with the Onset of Flowering and Meristem Transitioning

Cited by 13 publications

References 47 publications

A phylogenetically conserved APETALA2/ETHYLENE RESPONSE FACTOR, ERF12, regulates Arabidopsis floral development

A phylogenetically conserved APETALA2/ETHYLENE RESPONSE FACTOR, ERF12, regulates Arabidopsis floral development

Natural variation in stress response gene activity in the allopolyploid Arabidopsis suecica

SLGT11 Controls Floral Organ Patterning and Floral Meristem Termination in Tomato

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