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JOURNAL ARTICLES
Genetic ablation of petal and stamen primordia to elucidate cell interactions during floral development
C.D. Day, B.F. Galgoci, V.F. Irish
Development 1995 121: 2887-2895;

Summary

Two models have been proposed to explain the coordinated development of the four whorls of floral organs. The spatial model predicts that positional information defines the four whorls simultaneously, and that individual organs develop independently of surrounding tissues. The sequential model suggests that inductive events between the outer and inner whorl primordia are required for appropriate organogenesis. To test these models we have genetically ablated second and third whorl floral organ primordia to determine if organ identity, number or position are perturbed in the first or fourth whorls. We used diphtheria toxin to specifically ablate floral cells early in development in Nicotiana tabacum and in Arabidopsis thaliana. Second and third whorl expression of the diphtheria toxin A chain coding sequence (DTA) was conferred by the Arabidopsis APETALA3 (AP3) promoter. Both Nicotiana and Arabidopsis flowers that express the AP3-DTA construct lack petals and stamens; it appears that the second and third whorl cells expressing this construct arrest early in floral development. These results show that first and fourth whorl development is normal and can proceed without information from adjacent second and third whorl primordia. We propose that positional information specifies the establishment of all four whorls of organs prior to the expression of AP3 in the floral meristem.

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JOURNAL ARTICLES
Genetic ablation of petal and stamen primordia to elucidate cell interactions during floral development
C.D. Day, B.F. Galgoci, V.F. Irish
Development 1995 121: 2887-2895;
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