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THE PLANT CELL, Vol 9, Issue 9 1661-1671, Copyright © 1997 by American Society of Plant Biologists
Expression of Expansin Genes Is Correlated with Growth in Deepwater Rice
H. T. Cho and H. Kende
Michigan State University-Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824-1312
Expansins are a family of proteins that catalyze long-term extension of
isolated cell walls. Previously, two expansin proteins have been isolated
from internodes of deepwater rice, and three rice expansin genes, Os-EXP1,
Os-EXP2, and Os-EXP3, have been identified. We report here on the
identification of a fourth rice expansin gene, Os-EXP4, and on the
expression pattern of the rice expansin gene family in deepwater rice. Rice
expansin genes show organ-specific differential expression in the
coleoptile, root, leaf, and internode. In these organs, there is increased
expression of Os-EXP1, Os-EXP3, and Os-EXP4 in developmental regions where
elongation occurs. This pattern of gene expression is also correlated with
acid-induced in vitro cell wall extensibility. Submergence and treatment
with gibberellin, both of which promote rapid internodal elongation,
induced accumulation of Os-EXP4 mRNA before the rate of growth started to
increase: Our results indicate that the expression of expansin genes,in
deepwater rice is differentially regulated by developmental, hormonal, and
environmental signals and is correlated with cell elongation.
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