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Plant Physiol, June 2000, Vol. 123, pp. 509-520
The Role of the Arabidopsis ELD1 Gene in Cell
Development and Photomorphogenesis in Darkness1
Jin-Chen
Cheng,
Kvin
Lertpiriyapong,
Susanna
Wang, and
Zinmay Renee
Sung*
Department of Plant and Microbial Biology, University of
California, Berkeley, California 94720
Because cell growth and differentiation are regulated by complex
interactions among different signaling pathways, a growth defect
affects subsequent differentiation. We report on a growth-defective mutant of Arabidopsis, called eld1 (elongation defective
1). Cell elongation was impaired in every organ examined. Later
characteristics of the eld1 phenotype include defective
vascular tissue differentiation, the inability to grow in soil, ectopic
deposition of suberin around twisted vascular bundles, the
de-etiolation phenotype, and continuation of shoot development and
flowering in the dark. The dwarf phenotype of eld1 could
not be rescued by treatment with exogenous growth regulators. Because
defective cell elongation is the earliest and most universal feature
detected in eld1 mutants, control of or activity in cell
elongation may be the primary function of the ELD1 gene.
The impaired cell growth results in pleiotropic effects on cell
proliferation and differentiation, and the retardation in hypocotyl
elongation enables growth and development in darkness.
1
This work was supported by the National Science
Foundation (grant no. IBN-9513522).
*
Corresponding author; e-mail address
zrsung{at}nature.berkeley.edu; fax 510-642-4995.
© 2000 American Society of Plant Physiologists
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