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Abstract
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fusca3: A Heterochronic Mutation Affecting Late Embryo Development in Arabidopsis.

K. Keith, M. Kraml, N. G. Dengler, P. McCourt
K. Keith
Department of Botany, The University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada M5S 3B2.
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M. Kraml
Department of Botany, The University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada M5S 3B2.
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N. G. Dengler
Department of Botany, The University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada M5S 3B2.
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P. McCourt
Department of Botany, The University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada M5S 3B2.
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Published May 1994. DOI: https://doi.org/10.1105/tpc.6.5.589

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Abstract

Molecular studies of late embryogenesis and seed development have emphasized differential gene expression as a means of identifying discrete stages of embryogenesis. Little has been done to identify factors that regulate the length of a given developmental stage or the degree of overlap between adjacent developmental programs. We designed a genetic screen to identify mutations that disrupt late embryo development in Arabidopsis without loss of hormonal responses. One such mutation, fusca3 (fus3), alters late embryo functions, such as the establishment of dormancy and desiccation tolerance, and reduces storage protein levels. fus3 cotyledons bear trichomes, and their ultrastructure is similar to that of leaf primordia. Immature fus3 embryos enter germinative development, and the shoot apical meristems develop leaf primordia before seed desiccation begins. The cotyledons resemble leaf primordia, yet retain some cotyledon characteristics; thus, cotyledon- and leaf-specific functions are expressed simultaneously. Together, these observations are consistent with a heterochronic interpretation of the fus3 mutation.

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fusca3: A Heterochronic Mutation Affecting Late Embryo Development in Arabidopsis.
K. Keith, M. Kraml, N. G. Dengler, P. McCourt
The Plant Cell May 1994, 6 (5) 589-600; DOI: 10.1105/tpc.6.5.589

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fusca3: A Heterochronic Mutation Affecting Late Embryo Development in Arabidopsis.
K. Keith, M. Kraml, N. G. Dengler, P. McCourt
The Plant Cell May 1994, 6 (5) 589-600; DOI: 10.1105/tpc.6.5.589
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