Journal
JOURNAL OF PLANT GROWTH REGULATION
Volume 20, Issue 1, Pages 87-94Publisher
SPRINGER
DOI: 10.1007/s003440010004
Keywords
gibberellin; feed-back; feed-forward; deactivation; GA 2-oxidation
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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 GA(20), GA(29), GA(1), and GA(8) 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.
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