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Feed-forward regulation of gibberellin deactivation in pea
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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 |
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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 |
Item Statistics: | View statistics for this item |
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