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THE PLANT CELL, Vol 6, Issue 5 589-600, Copyright © 1994 by American Society of Plant Biologists

RESEARCH ARTICLES

fusca3: A Heterochronic Mutation Affecting Late Embryo Development in Arabidopsis

K. Keith, M. Kraml, N. G. Dengler and P. McCourt
Department of Botany, The University of Toronto, 25 Willcocks Street, Toronto, Ontario, Canada M5S 3B2

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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