Molecular cloning of ABNORMAL FLORAL ORGANS : a gene required for flower development in Arabidopsis

1999 ◽  
Vol 12 (2) ◽  
pp. 118-122 ◽  
Author(s):  
Mande K. Kumaran ◽  
D. Ye ◽  
Wei-Cai Yang ◽  
Megan E. Griffith ◽  
Abdul M. Chaudhury ◽  
...  
Keyword(s):  
Molecular Cloning ◽  
Flower Development ◽  
Floral Organs

Parallels between Unusual Floral Organs and FIMBRIATA, Genes Controlling Flower Development in Arabidopsis and Antirrhinum

1995 ◽  
Vol 7 (9) ◽  
pp. 1501
Author(s):  
Gwyneth C. Ingram ◽  
Justin Goodrich ◽  
Mark D. Wilkinson ◽  
Rudiger Simon ◽  
George W. Haughn ◽  
...  
Keyword(s):  
Flower Development ◽  
Floral Organs

Isolation and characterization of novel mutants of Arabidopsis thaliana defective in flower development

Development ◽  
1988 ◽  
Vol 104 (2) ◽  
pp. 195-203 ◽  
Author(s):  
M.K. Komaki ◽  
K. Okada ◽  
E. Nishino ◽  
Y. Shimura
Keyword(s):  
Arabidopsis Thaliana ◽  
Genetic Control ◽  
Flower Development ◽  
Higher Plant ◽  
Genetic Analyses ◽  
Floral Organs ◽  
Isolation And Characterization ◽  
Homeotic Conversion

We have isolated a number of mutants of Arabidopsis thaliana, a member of the mustard family, that have defects in flower development and morphogenesis. Of these, five mutants have been extensively characterized. Two mutants (Fl-40, Fl- 48) lacking petals show homeotic conversion of sepals to carpels. One mutant (Fl-54) displays highly variable phenotypes, including several types of homeotic variations, loss or distorted positions of the floral organs as well as abnormal structures on the inflorescence. Two other mutants (Fl-82, Fl-89) show aberrant structures in the pistils. Genetic analyses have revealed that these mutations are single and recessive, except for one mutant whose mutational loci still remain to be determined. These mutants may prove useful for the analysis of the genetic control of flower development and morphogenesis in the higher plant.

scholarly journals Inflorescence and flower development in Costus scaber (Costaceae)

1988 ◽  
Vol 66 (2) ◽  
pp. 339-345 ◽  
Author(s):  
Bruce K. Kirchoff
Keyword(s):  
Flower Development ◽  
Floral Organs ◽  
Complete Development ◽  
The Third ◽  
Terminal Flower ◽  
Outer Whorl ◽  
Anodic Side ◽  
Precocious Development ◽  
Rhizome System

The inflorescence of Costus scaber terminates an erect axis of a sympodial rhizome system. Primary bracts are borne on the inflorescence in spiral monostichous phyllotaxy. One-flowered cincinni occur in the axils of these bracts. Each cincinnus consists of an axis bearing a terminal flower and a secondary bract on the anodic side of the flower. A tertiary bud forms in the axil of this bract but does not complete development. The inflorescence terminates by cessation of growth of the apex and precocious development of the primary bracts. Floral organs are formed sequentially beginning with the calyx, and continuing with the corolla and inner androecial whorl, outer androecial whorl, and gynoecium. All flower parts, except for the calyx, originate from a ring primordium. Regions of this primordium separate to form the corolla and inner androecial members. It was not possible to determine the sequence of androecial member formation. The labellum is composed of five androecial members, three from the outer whorl and two from the inner. The third member of the inner whorl forms the stamen and its petaloid appendage. The gynoecium forms from three conduplicate primordia. The margins of two of these primordia are the product of phyietic fusion.

scholarly journals Parallels between UNUSUAL FLORAL ORGANS and FIMBRIATA, genes controlling flower development in Arabidopsis and Antirrhinum.

1995 ◽  
Vol 7 (9) ◽  
pp. 1501-1510 ◽  
Author(s):  
G C Ingram ◽  
J Goodrich ◽  
M D Wilkinson ◽  
R Simon ◽  
G W Haughn ◽  
...  
Keyword(s):  
Flower Development ◽  
Floral Organs

scholarly journals A Genetic Screen for Modifiers of UFO Meristem Activity Identifies Three Novel FUSED FLORAL ORGANS Genes Required for Early Flower Development in Arabidopsis

Genetics ◽  
1998 ◽  
Vol 149 (2) ◽  
pp. 579-595
Author(s):  
Joshua Z Levin ◽  
Jennifer C Fletcher ◽  
Xuemei Chen ◽  
Elliot M Meyerowitz
Keyword(s):  
Flower Development ◽  
Control Cell ◽  
Floral Organ ◽  
Genetic Screen ◽  
Inflorescence Development ◽  
Cauline Leaf ◽  
Floral Organs ◽  
Complementation Groups ◽  
Control Organ ◽  
Early Flower

Abstract In a screen to identify novel genes required for early Arabidopsis flower development, we isolated four independent mutations that enhance the Ufo phenotype toward the production of filamentous structures in place of flowers. The mutants fall into three complementation groups, which we have termed FUSED FLORAL ORGANS (FFO) loci. ffo mutants have specific defects in floral organ separation and/or positioning; thus, the FFO genes identify components of a boundary formation mechanism(s)acting between developing floral organ primordia. FFO1 and FFO3 have specific functions in cauline leaf/stem separation and in first- and third-whorl floral organ separation, with FFO3 likely acting to establish and FFO1 to maintain floral organ boundaries. FFO2 acts at early floral stages to regulate floral organ number and positioning and to control organ separation within and between whorls. Plants doubly mutant for two ffo alleles display additive phenotypes, indicating that the FFO genes may act in separate pathways. Plants doubly mutant for an ffo gene and for ufo, lfy, or clv3 reveal that the FFO genes play roles related to those of UFO and LFY in floral meristem initiation and that FFO2 and FFO3 may act to control cell proliferation late in inflorescence development.

Ectopic formation of trichomes and stomata in floral organs of Arabidopsis thaliana induced by thidiazuron

1994 ◽  
Vol 72 (5) ◽  
pp. 671-677 ◽  
Author(s):  
S. P. Venglat ◽  
V. K. Sawhney
Keyword(s):  
Arabidopsis Thaliana ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Key Words ◽  
Flower Development ◽  
Pollen Grains ◽  
Urea Derivative ◽  
Stages Of Development ◽  
Floral Organs ◽  
Scanning Electron

Thidiazuron (TDZ), a urea derivative, was applied to the inflorescences of Arabidopsis thaliana at early stages of development to study its effect on flower development. Scanning electron microscope observations revealed that TDZ induced the formation of branched trichomes on sepals and carpels and stomata on petals that are not normally produced on these organs. Concurrently, TDZ also suppressed the development of pollen grains in the anthers and ovules in the ovaries. In addition, TDZ induced an increase in the size of all the floral organs except stamens. These observations suggest that thidiazuron alters the differentiation processes in floral organs by inducing the production of traits that are characteristic of cauline leaves, i.e., trichomes and stomata. Key words: Arabidopsis thaliana, flower development, stomata, thidiazuron, trichomes.

scholarly journals TSO1 functions in cell division during Arabidopsis flower development

Development ◽  
1997 ◽  
Vol 124 (3) ◽  
pp. 665-672 ◽  
Author(s):  
Z. Liu ◽  
M.P. Running ◽  
E.M. Meyerowitz
Keyword(s):  
Cell Division ◽  
Flower Development ◽  
Cell Walls ◽  
Dna Ploidy ◽  
Floral Meristem ◽  
Specific Cell ◽  
Floral Organs ◽  
Size And Shape ◽  
Cell Layers ◽  
Arabidopsis Mutant

We describe an Arabidopsis mutant, tso1, which develops callus-like tissues in place of floral organs. The tso1 floral meristem lacks properly organized three cell layers, and the nuclei of these cells are irregular in size and shape. Further analyses reveal partially formed cell walls and increased DNA ploidy in tso1 floral meristem cells, indicating defects in mitosis and cytokinesis. Our finding that TSO1 is required for organ formation in floral tissues but not in other tissues indicates that TSO1 may encode a floral-specific cell division component, or that TSO1 function is redundant in nonfloral tissues.

CHORIPETALA and DESPENTEADO: general regulators during plant development and potential floral targets of FIMBRIATA-mediated degradation

Development ◽  
2000 ◽  
Vol 127 (17) ◽  
pp. 3725-3734
Author(s):  
M. Wilkinson ◽  
E. de Andrade Silva ◽  
S. Zachgo ◽  
H. Saedler ◽  
Z. Schwarz-Sommer
Keyword(s):  
Plant Development ◽  
Flower Development ◽  
Ectopic Expression ◽  
Regulatory Function ◽  
Wild Type ◽  
Floral Organs ◽  
Class B ◽  
In The Wild ◽  
Class B Gene ◽  
F Box Protein

Two Antirrhinum majus mutants, choripetala (cho) and despenteado (desp), exhibit identical highly pleiotropic phenotypes including petaloid transformation of first whorl floral organs, narrowing of both vegetative and floral organs, reduction in carpel size and fertility and delayed germination. The petaloid first whorl results from ectopic expression of the class B genes DEFICIENS and GLOBOSA and is correlated with the ectopic expression of the proposed class B/C gene regulator FIMBRIATA (FIM). Ectopic class B gene expression is apparent from the earliest point at which class B gene transcription can be detected in the wild type, indicating that the pre-patterning of the class B domain has been disrupted in these mutants. Single and double mutant analyses indicate that CHO and DESP also play a role in regulation of the class C domain. Interestingly, the cho and desp mutations partially suppress the phenotype of fim null mutants, suggesting that the F-box protein FIM may target a member of the CHO/DESP pathway for degradation. We propose that CHO and DESP are members of a ‘basal regulatory function’ influencing many processes throughout plant development and in particular are directly or indirectly required for the repression of class B and C genes during early stages of flower development.

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