The Internal Meristem Layer (L3) Determines Floral Meristem Size and Carpel Number in Tomato Periclinal Chimeras

1992 ◽  
Vol 4 (9) ◽  
pp. 1089 ◽  
Author(s):  
Eugene J. Szymkowiak ◽  
Ian M. Sussex
Keyword(s):  
Floral Meristem ◽  
Meristem Size ◽  
Carpel Number ◽  
Periclinal Chimeras

scholarly journals The internal meristem layer (L3) determines floral meristem size and carpel number in tomato periclinal chimeras.

1992 ◽  
Vol 4 (9) ◽  
pp. 1089-1100 ◽  
Author(s):  
E J Szymkowiak ◽  
I M Sussex
Keyword(s):  
Floral Meristem ◽  
Meristem Size ◽  
Carpel Number ◽  
Periclinal Chimeras

The ULTRAPETALA gene controls shoot and floral meristem size in Arabidopsis

Development ◽  
2001 ◽  
Vol 128 (8) ◽  
pp. 1323-1333 ◽  
Author(s):  
J.C. Fletcher
Keyword(s):  
Signal Transduction Pathway ◽  
Floral Meristem ◽  
Transduction Pathway ◽  
Wild Type ◽  
Inflorescence Meristem ◽  
Genetic Studies ◽  
Meristem Cell ◽  
Meristem Size ◽  
Cell Accumulation ◽  
Floral Meristems

The regulation of proper shoot and floral meristem size during plant development is mediated by a complex interaction of stem cell promoting and restricting factors. The phenotypic effects of mutations in the ULTRAPETALA gene, which is required to control shoot and floral meristem cell accumulation in Arabidopsis thaliana, are described. ultrapetala flowers contain more floral organs and whorls than wild-type plants, phenotypes that correlate with an increase in floral meristem size preceding organ initiation. ultrapetala plants also produce more floral meristems than wild-type plants, correlating with an increase in inflorescence meristem size without visible fasciation. Expression analysis indicates that ULTRAPETALA controls meristem cell accumulation partly by limiting the domain of CLAVATA1 expression. Genetic studies show that ULTRAPETALA acts independently of ERA1, but has overlapping functions with PERIANTHIA and the CLAVATA signal transduction pathway in controlling shoot and floral meristem size and meristem determinacy. Thus ULTRAPETALA defines a novel locus that restricts meristem cell accumulation in Arabidopsis shoot and floral meristems.

Floral meristem size and organ number correlation in Eucryphia (Cunoniaceae)

2018 ◽  
Vol 131 (3) ◽  
pp. 429-441 ◽  
Author(s):  
Kester Bull-Hereñu ◽  
Louis Ronse de Craene ◽  
Fernanda Pérez
Keyword(s):  
Floral Meristem ◽  
Meristem Size

scholarly journals The ERECTA receptor kinase regulates Arabidopsis shoot apical meristem size, phyllotaxy and floral meristem identity

Development ◽  
2014 ◽  
Vol 141 (4) ◽  
pp. 830-841 ◽  
Author(s):  
T. Mandel ◽  
F. Moreau ◽  
Y. Kutsher ◽  
J. C. Fletcher ◽  
C. C. Carles ◽  
...  
Keyword(s):  
Shoot Apical Meristem ◽  
Apical Meristem ◽  
Floral Meristem ◽  
Receptor Kinase ◽  
Floral Meristem Identity ◽  
Meristem Size ◽  
Meristem Identity

scholarly journals The CLAVATA1Gene Encodes a Putative Receptor Kinase That Controls Shoot and Floral Meristem Size in Arabidopsis

Cell ◽  
1997 ◽  
Vol 89 (4) ◽  
pp. 575-585 ◽  
Author(s):  
Steven E Clark ◽  
Robert W Williams ◽  
Elliot M Meyerowitz
Keyword(s):  
Floral Meristem ◽  
Receptor Kinase ◽  
Meristem Size ◽  
Putative Receptor

scholarly journals The WIGGUM gene is required for proper regulation of floral meristem size in Arabidopsis

Development ◽  
1998 ◽  
Vol 125 (14) ◽  
pp. 2545-2553 ◽  
Author(s):  
M.P. Running ◽  
J.C. Fletcher ◽  
E.M. Meyerowitz
Keyword(s):  
Cell Division ◽  
Apical Meristem ◽  
Critical Role ◽  
Floral Meristem ◽  
Similar Process ◽  
Genetic Studies ◽  
Meristem Size ◽  
Separate Pathway ◽  
Mutant Phenotypes ◽  
Floral Meristems

The study of cell division control within developing tissues is central to understanding the processes of pattern formation. The floral meristem of angiosperms gives rise to floral organs in a particular number and pattern. Despite its critical role, little is known about how cell division is controlled in the floral meristem, and few genes involved have been identified. We describe the phenotypic effects of mutations in WIGGUM, a gene required for control of cell proliferation in the floral and apical meristem of Arabidopsis thaliana. wiggum flowers contain more organs, especially sepals and petals, than found in wild-type flowers. This organ number phenotype correlates with specific size changes in the early floral meristem, preceding organ initiation. Genetic studies suggest that WIGGUM acts on a similar process but in a separate pathway than the CLAVATA1 and CLAVATA3 genes in meristem size regulation, and reveal interactions with other genes affecting meristem structure and identity. Analysis of double mutant phenotypes also reveals a role for WIGGUM in apical meristem function. We propose that WIGGUM plays a role in restricting cell division relative to cellular differentiation in specific regions of the apical and floral meristems.

Developmental characterization of the fasciated locus and mapping of Arabidopsis candidate genes involved in the control of floral meristem size and carpel number in tomato

Genome ◽  
2006 ◽  
Vol 49 (8) ◽  
pp. 991-1006 ◽  
Author(s):  
L S Barrero ◽  
B Cong ◽  
F Wu ◽  
S D Tanksley
Keyword(s):  
Candidate Genes ◽  
Phylogenetic Analyses ◽  
Tomato Fruit ◽  
Fruit Size ◽  
Floral Meristem ◽  
Developmental Study ◽  
Chromosome 2 ◽  
Meristem Size ◽  
Locule Number ◽  
Meristem Development

Mutation at the fasciated locus was a key step in the production of extreme fruit size during tomato domestication. To shed light on the nature of these changes, near-isogenic lines were used for a comparative developmental study of fasciated and wild-type tomato plants. The fasciated gene directly affects floral meristem size and is expressed before the earliest stages of flower organogenesis. As a result, mature fruit of fasciated mutants have more carpels (locules) and greater fruit diameter and mass. The discovery that fasciated affects floral meristem size led to a search for candidate genes from Arabidopsis known to be involved in floral meristem development. Putative homologs were identified in a large tomato EST database, verified through phylogenetic analyses, and mapped in tomato; none mapped to the fasciated locus; however, putative homologs of WUS and WIG mapped to the locule number locus on chromosome 2, the second major transition to large tomato fruit, with WUS showing the highest association. In other cases, minor QTLs for floral organ number (lcn2.2) and (stn11.2) co-localized with a CLV1 paralog and with the syntenic region containing the CLV3 gene in Arabidopsis, respectively.Key words: fasciated, floral meristem, locule number, Arabidopsis, fruit.

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