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PMID:2535466

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Citation

Bowman, JL, Smyth, DR and Meyerowitz, EM (1989) Genes directing flower development in Arabidopsis. Plant Cell 1:37-52

Abstract

We describe the effects of four recessive homeotic mutations that specifically disrupt the development of flowers in Arabidopsis thaliana. Each of the recessive mutations affects the outcome of organ development, but not the location of organ primordia. Homeotic transformations observed are as follows. In agamous-1, stamens to petals; in apetala2-1, sepals to leaves and petals to staminoid petals; in apetala3-1, petals to sepals and stamens to carpels; in pistillata-1, petals to sepals. In addition, two of these mutations (ap2-1 and pi-1) result in loss of organs, and ag-1 causes the cells that would ordinarily form the gynoecium to differentiate as a flower. Two of the mutations are temperature-sensitive. Temperature shift experiments indicate that the wild-type AP2 gene product acts at the time of primordium initiation; the AP3 product is active later. It seems that the wild-type alleles of these four genes allow cells to determine their place in the developing flower and thus to differentiate appropriately. We propose that these genes may be involved in setting up or responding to concentric, overlapping fields within the flower primordium.

Links

PubMed PMC159735 Online version:10.1105/tpc.1.1.37

Keywords

Alleles; Genes, Recessive; Microscopy, Electron, Scanning; Mutation; Phenotype; Plant Development; Plants/genetics; Plants/ultrastructure

Significance

Annotations

Gene product Qualifier GO Term Evidence Code with/from Aspect Extension Notes Status

ARATH:Q9SX14

GO:0048438: floral whorl development

ECO:0000315:

P

Fig 1B, Figure 2B shows the SEM micrograph of four stages of flower development, with a nested flower (sepals and petals replacing stamens and carpels). Table 1 summarizes their findings, with the third and fourth whorl of mutant flowers differing from wild-type.

complete
CACAO 8201

ARATH:Q9SX14

involved_in

GO:0048438: floral whorl development

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:AP2

GO:0010093: specification of floral organ identity

ECO:0000315:

P

Figure 2C shows the SEM micrograph of four stages of flower development, with sepals replaced by leaves.

Table 1 summarizes the findings, with the first and second whorl of mutant flowers differing from wild-type, varying depending on temperature.

complete
CACAO 8214

ARATH:AP2

involved_in

GO:0010093: specification of floral organ identity

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:AP3

GO:0010093: specification of floral organ identity

ECO:0000315:

P

Figure 2D shows the SEM micrograph of four stages of flower development, with sepals developing in place of petals.

Table 1 summarizes the findings, with the second and third whorl of mutant flowers differing from wild-type, varying depending on temperature. The higher the temperature, the more altered the organs.

complete
CACAO 8217

ARATH:AP3

involved_in

GO:0010093: specification of floral organ identity

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete

ARATH:PIST

GO:0010093: specification of floral organ identity

ECO:0000315:

P

Figure 2E shows the SEM micrograph of four stages of flower development, with no third whorl.

Table 1 summarizes their findings, with the second, third, and fourth whorl of mutant flowers differing from wild-type.

complete
CACAO 8222

ARATH:PIST

involved_in

GO:0010093: specification of floral organ identity

ECO:0000315: mutant phenotype evidence used in manual assertion

P

Seeded From UniProt

complete


See also

References

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