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Abstract

The early steps in the gibberellin (GA) biosynthetic
pathway are controlled by single copy genes
or small gene families. In pea (Pisum sativum L.) there
are two ent-kaurenoic acid oxidases, one expressed only
in the seeds, while ent-copalyl synthesis and ent-kaurene
oxidation appear to be controlled by single copy genes.
None of these genes appear to show feedback regulation
and the only major developmental regulation appears
to be during seed development. During shoot
maturation, transcript levels do not change markedly
with the result that all the three genes examined are
expressed in mature tissue, supporting recent findings
that these tissues can synthesise GAs. It therefore appears
that the regulation of bioactive GA levels are
determined by the enzymes encoded by the 2-oxoglutarate-
dependent dioxygenase gene families controlling
the later steps in GA biosynthesis. However the early
steps are nonetheless important as a clear log/linear
relationship exists between elongation and the level of
GA1 in a range of single and double mutants in genes
controlling these steps.

Item Type:	Article
Authors/Creators:	Davidson, SE and Swain, SM and Reid, JB
Journal or Publication Title:	Planta
ISSN:	0032-0935
DOI / ID Number:	https://doi.org/10.1007/s00425-005-0045-7
Additional Information:	The final publication is available at http://www.springerlink.com
Item Statistics:	View statistics for this item

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