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THE PLANT CELL, Vol 6, Issue 1 25-41, Copyright © 1994 by American Society of Plant Biologists
A FUSCA Gene of Arabidopsis Encodes a Novel Protein Essential for Plant Development
L. A. Castle and D. W. Meinke
Department of Botany, Oklahoma State University, 104 Life Sciences East, Stillwater, Oklahoma 74078
Arabidopsis fusca mutants display striking purple coloration due to
anthocyanin accumulation in their cotyledons. We describe six recessive
fusca mutants isolated from Agrobacterium-transformed Arabidopsis families.
These mutants first become defective during embryogenesis and exhibit
limited seedling development. Double mutant constructs revealed that
developmental defects were not simply a consequence of anthocyanin
accumulation. fusca seedlings showed altered responses to several
environmental and endogenous factors. Allelism tests established that three
fusca loci are represented by mutants previously described as defective in
light-regulated responses. To study the molecular basis of the fusca
phenotype, we cloned the FUS6 gene. FUS6 encodes a novel protein that is
hydrophilic, [alpha]-helical, and contains potential protein kinase C
phosphorylation sites. The FUSCA proteins appear to act in a network of
signal transduction pathways critical for plant development.
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