Regulation of Arabidopsis Flower Development

Okamuro, Jack K.; Boer, Bart G. W. den; Jofuku, K. Diane

doi:10.2307/3869772

Cited by 47 publications

(74 citation statements)

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“…Alternatively, the production of leaves might reflect a partia1 transformation in meristem identity from flower to shoot dueto the role of AP2 in the establishment of floral meristem identity. Consistent with this hypothesis, previous studies have reported that the inflorescence-like traits of weak ap2 flowers are dramatically enhanced by SD photoperiod (Komaki et al, 1988;Okamuro et al, 1993;Schultz and Haughn, 1993). As shown in Figure 1 D, the most striking alteration in ap2-7 flower development is the production of ectopic secondary or axillary flowers.…”

Section: Transforming Ap2-1 Flowers Into Shootssupporting

confidence: 71%

“…Previously, we showed that phytochrome and GAs also control the maintenance of flower meristem identity both in ag and in heterozygous Ify mutant flowers. In these mutants, the SD photoperiod induces a heterochronic switch from flower to shoot development, a dramatic transformation known as floral meristem reversion (Okamuro et al, 1993(Okamuro et al, , 1996. Floral meristem reversion in ag and in heterozygous Ify flowers is phytochrome dependent and is genetically suppressed by spy and by exogenous GAs (Okamuro et al, 1996).…”

Section: Control Of Flower Meristem Identity By Gasmentioning

confidence: 99%

“…SD-grown ap2-7 flowers reportedly show enhanced inflorescence-like characteristics (Komaki et al, 1988;Okamuro et al, 1993;Schultz and Haughn, 1993). Similarly, the inflorescence-like nature of ap7 flower development (A) LD ap2-1 flower taken from a basipetal position on the primary inflorescence.…”

Section: Apetala2 (Ap2) Leafy (Lfy) Caullflower (Cal) Termlnal Flomentioning

confidence: 99%

“…Previously, we showed that the floral meristem mutants ag and /v can be used to characterize the signals that control the maintenance of flower meristem identity in Arabidopsis (Okamuro et al, 1993(Okamuro et al, , 1996. In this study, we have begun to analyze the signals that control the establishment of flower meristem identity and meristem determinacy by using the floral mutants ap2 and ap7.…”

Section: Apetala2 (Ap2) Leafy (Lfy) Caullflower (Cal) Termlnal Flomentioning

confidence: 99%

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Photo and hormonal control of meristem identity in the Arabidopsis flower mutants apetala2 and apetala1.

et al. 1997

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We have analyzed the contributions of phytochrome and gibberellin signal transduction to the control of flower meristem identity in the Arabidopsis mutants apetala7 (ap7) and apetala2 (ap2). ap7 flowers are partially defective for the establishment of flower meristem identity and are characterized by the production of ectopic secondary or axillary flowers and by branching. Axillary flower production is also induced in ap2-7 flowers by short-day photoperiod and is suppressed by hy7, a mutation blocking phytochrome activity. The production of axillary flowers by ap2-7 is also suppressed by exogenous gibberellins and by spindly (spy), a mutation that activates basal gibberellin signal transduction in a hormone-independent manner. Ectopic axillary flower production and floral branching by ap7 flowers are also suppressed by spyLWe conclude that gibberellins promote flower meristem identity and that the inflorescence-like traits of ap2-7 and ap7-7 flowqrs are due in part to SPY gene activity.\

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Section: Transforming Ap2-1 Flowers Into Shootssupporting

confidence: 71%

Section: Control Of Flower Meristem Identity By Gasmentioning

confidence: 99%

Section: Apetala2 (Ap2) Leafy (Lfy) Caullflower (Cal) Termlnal Flomentioning

confidence: 99%

Section: Apetala2 (Ap2) Leafy (Lfy) Caullflower (Cal) Termlnal Flomentioning

confidence: 99%

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Photo and hormonal control of meristem identity in the Arabidopsis flower mutants apetala2 and apetala1.

et al. 1997

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“…Previous studies have shown that TFL1 acts predominantly to oppose establishment of floral meristem identity but does not antagonize the maintenance of floral meristems 6,7,[10][11][12] . The simple establishment of floral meristem identity is insufficient to guarantee floral identity, as indicated by the observation that a floral meristem can revert to a flower-generating inflorescence meristem, a phenomenon called floral reversion 5,[13][14][15] . Floral reversion occurs for the most part in mutant genetic backgrounds, such as ap1, lfy and agamous, suggesting that wild-type plants have default processes to suppress this reversion, and that active maintenance of floral meristem identity is required after its establishment.…”

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confidence: 99%

Repression of AGAMOUS-LIKE 24 is a crucial step in promoting flower development

et al. 2004

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Genetics of sex determination in flowering plants

et al. 1994

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Most flowering plant species are hermaphroditic, but a small number of species in most plant families are unisexual (i.e., an individual will produce only male or female gametes). Because species with unisexual flowers have evolved repeatedly from hermaphroditic progenitors, the mechanisms controlling sex determination in flowering plants are extremely diverse. Sex is most strongly determined by genotype in all species but the mechanisms range from a single controlling lacus to sex chromosomes bearing several linked loci required for sex determination. Plant hormones also influence sex expression with variable effects from species to species. Here, we review the genetic control of sex determination from a number of plant species to illustrate the variety of extant mechanisms. We emphasize species that are now used as models to investigate the molecular biology of sex determination. We also present our own investigations of the structure of plant sex chromosomes of white campion (Silene latifolia = Melandrjum album). The cytogenetic basis of sex determination in white campion is similar to mammals in that it has a male-specific Y-chromosome that carries dominant male determining genes. If one copy of this chromosome is in the genome, the plant is male. Otherwise it is female. Like mammalian Y-chromosomes, the white campion Y-chromosome is rich in repetitive DNA. We isolated repetitive sequences from microdissected Y-chromosomes of white campion to study the distribution of homologous repeated sequences on the Y-chromosome and the other chromosomes. We found the Y to be especially rich in repetitive sequences that were generally dispersed over all the white campion chromosomes. Despite its repetitive character, the Y-chromosome is mainly euchromatic. This may be due to the relatively recent evolution of the white campion sex chromosomes compared to the sex chromosomes of animals.

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Regulation of Arabidopsis Flower Development

Cited by 47 publications

References 0 publications

Photo and hormonal control of meristem identity in the Arabidopsis flower mutants apetala2 and apetala1.

Photo and hormonal control of meristem identity in the Arabidopsis flower mutants apetala2 and apetala1.

Repression of AGAMOUS-LIKE 24 is a crucial step in promoting flower development

Genetics of sex determination in flowering plants

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