Fimbriata controls flower development by mediating between meristem and organ identity genes

Simon, Rüdiger; Carpenter, Rosemary; Doyle, Sandra; Coen, Enrico

doi:10.1016/0092-8674(94)90576-2

Cited by 136 publications

(141 citation statements)

References 15 publications

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“…floral) identity in the meristem, is opposite to that of APO1 counterparts. All UFO orthologs in dicot species reported so far promote floral fates (Simon et al, 1994;Levin and Meyerowitz, 1995;Taylor et al, 2001;Zhang et al, 2003;Lippman et al, 2008;Souer et al, 2008).…”

Section: Genetic Network Controlling Rice Inflorescence Branchingmentioning

confidence: 99%

“…Surprisingly, UFO and all its orthologs in dicot species reported so far including FIM, DOT, Proliferating Floral Organs, ANANTHA (AN), and Stamina pistillaoida promote floral fate, whereas ABERRANT PANICLE ORGANIZATION1 (APO1), a rice UFO ortholog, suppresses floral fate (Simon et al, 1994;Levin and Meyerowitz 1995;Souer et al, 1998Souer et al, , 2008Taylor et al, 2001;Zhang et al, 2003;Ikeda et al, 2007;Lippman et al, 2008). apo1 loss-of-function mutant plants exhibit precocious transition of the IM and rachis branch meristems into spikelet meristems, leading to formation of small inflorescences (Ikeda et al, , 2007.…”

mentioning

confidence: 99%

“…Basically, conserved systems driven by LFY/UFO orthologs control floral meristem identity in Antirrhinum and petunia (Petunia hybrida) although minor divergences in their mode of operation are observed. For example, DOUBLE TOP (DOT), a UFO ortholog, is the major determinant of floral meristem identity in petunia, whereas, in Arabidopsis and Antirrhinum, LFY and FLORICAULA (FLO) are major players that determine floral meristem identity (Weigel et al, 1992;Simon et al, 1994;Souer et al, 2008). Mutations in UFO or FIMBRIATA (FIM), an Antirrhinum UFO ortholog, confer only subtle effects on floral development.…”

mentioning

confidence: 99%

“…In Arabidopsis, key regulators of floral meristem identity have been reported (for review, see Sablowski, 2007). Among them, LEAFY (LFY) and UNUSUAL FLORAL ORGANS (UFO) are positive regulators of floral meristem identity and work in the same genetic pathway (Weigel et al, 1992;Simon, et al, 1994;Ingram et al, 1995;Lee et al, 1997;Chae et al, 2008). Basically, conserved systems driven by LFY/UFO orthologs control floral meristem identity in Antirrhinum and petunia (Petunia hybrida) although minor divergences in their mode of operation are observed.…”

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confidence: 99%

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Expression Level ofABERRANT PANICLE ORGANIZATION1Determines Rice Inflorescence Form through Control of Cell Proliferation in the Meristem

et al. 2009

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Two types of branches, rachis branches (i.e. nonfloral) and spikelets (i.e. floral), are produced during rice (Oryza sativa) inflorescence development. We previously reported that the ABERRANT PANICLE ORGANIZATION1 (APO1) gene, encoding an F-box-containing protein orthologous to Arabidopsis (Arabidopsis thaliana) UNUSUAL FLORAL ORGANS, suppresses precocious conversion of rachis branch meristems to spikelets to ensure generation of certain number of spikelets. Here, we identified four dominant mutants producing an increased number of spikelets and found that they are gain-of-function alleles of APO1. The APO1 expression levels are elevated in all four mutants, suggesting that an increase of APO1 activity caused the delay in the program shift to spikelet formation. In agreement with this result, ectopic overexpression of APO1 accentuated the APO1 gain-of-function phenotypes. In the apo1-D dominant alleles, the inflorescence meristem starts to increase in size more vigorously than the wild type when switching to the reproductive development phase. This alteration in growth rate is opposite to what is observed with the apo1 mutants that have a smaller inflorescence meristem. The difference in meristem size is caused by different rates of cell proliferation. Collectively, these results suggest that the level of APO1 activity regulates the inflorescence form through control of cell proliferation in the meristem.

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Section: Genetic Network Controlling Rice Inflorescence Branchingmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Expression Level ofABERRANT PANICLE ORGANIZATION1Determines Rice Inflorescence Form through Control of Cell Proliferation in the Meristem

et al. 2009

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“…A combination of expression patterns and mutant phenotypes has suggested that certain floral genes may play a role in limiting cell-cell communication in flower development, fimbriata (tim) between whorls 1 and 2 and whorls 2 and 3. fire mutants have homeotic conversions and chimeric organs in whorls 2 and 3 (Simon et al 1994). unusual floral organs (ufo) is considered to be the cognate ortholog of fire in Arabidopsis (Ingram et al 1995).…”

Section: Boundaries Defined By Regulatory Genesmentioning

confidence: 99%