Jurgens et al Summary - Genetic analysis of pattern...

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Genetic analysis of pattern formation in Arabidopsis embryo J URGENS ET AL . Summary A large-scale screen for morphologically abnormal seedling mutants yielded about 250 lines, and genetic evidence suggests saturation of the genome for this kind of mutation Mutant seedling phenotypes result from abnormal development in the early embryo Introduction The young seedling, which results from pattern formation in the embryo, looks very different from the mature plant o The shoot and the root meristems are located at opposite poles of the main body axis Although the mature plant is exclusively derived from the two meristems, the overall organisation of the plant body appears to be conditioned by the pattern generated in the embryo. Evidence: o The apical-basal polarity of the embryo is stably maintained during postembryonic development o The leaves, which are produced by the SAM, are normally arranged in a specific manner called phyllotaxis If the number of cotyledons (seedling leaves) is increased from two to three, there is a corresponding change in phyllotaxis Three lessons can be learned from the analysis of pattern formation in Drosophila: o Relatively few genes contribute to pattern formation in the embryo o If any of these genes are inactivated by mutation, embryonic development is not
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