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Abstract

Multiple lines of evidence suggest that the genes involved
in gibberellin (GA) biosynthesis are regulated
by bioactive GA levels. With the recent cloning of
GA 2-oxidase genes from pea, we investigated
whether this homeostatic regulation extends to the
genes controlling GA deactivation in this species,
utilizing two well-characterized GA-deficient mutants,
ls and na and a GA-accumulating mutant, sln.
The pea GA 2-oxidases showed feed-forward effects
at the mRNA level, while the endogenous levels of
GA20, GA29, GA1, and GA8 showed no evidence of
feed-forward regulation. Analyses of genomic
Southern blots and expressed sequenced tag (EST)
databases suggest that other GA 2-oxidases could
possibly account for this lack of feed-forward on GA
levels.

Item Type:	Article
Authors/Creators:	Elliott, RC and Ross, JJ and Smith, JJ and Lester, DR and Reid, JB
Journal or Publication Title:	Journal of plant growth regulation
ISSN:	0721-7595
DOI / ID Number:	10.1007/s003440010004
Additional Information:	Copyright 2001 Springer-Verlag
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