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Plant Physiol, February 2002, Vol. 128, pp. 734-741
Control of Gibberellin Levels and Gene Expression during
De-Etiolation in Pea1
James B.
Reid,*
Natasha A.
Botwright,
Jennifer J.
Smith,
Damian P.
O'Neill, and
L. Huub J.
Kerckhoffs
School of Plant Science, University of Tasmania, G.P.O. Box
252-55, Hobart, Tasmania, 7001, Australia
Gibberellin A1 (GA1) levels drop
significantly in wild-type pea (Pisum sativum) plants
within 4 h of exposure to red, blue, or far-red light. This
response is controlled by phytochrome A (phyA) (and not phyB) and a
blue light receptor. GA8 levels are increased in response
to 4 h of red light, whereas the levels of GA19,
GA20, and GA29 do not vary substantially. Red
light appears to control GA1 levels by down-regulating the
expression of Mendel's LE (PsGA3ox1)
gene that controls the conversion of GA20 to
GA1, and by up-regulating PsGA2ox2, which
codes for a GA 2-oxidase that converts GA1 to
GA8. This occurs within 0.5 to 1 h of exposure to red
light. Similar responses occur in blue light. The major GA 20-oxidase
gene expressed in shoots, PsGA20ox1, does not show substantial light regulation, but does show up-regulation after 4 h of red light, probably as a result of feedback regulation. Expression
of PsGA3ox1 shows a similar feedback response, whereas PsGA2ox2 shows a feed-forward response. These results
add to our understanding of how light reduces shoot elongation during
de-etiolation.
1
This work was supported by the
Australian Research Council.
*
Corresponding author; e-mail Jim.Reid{at}utas.edu.au; fax
61-3-6226-2698.
© 2002 American Society of Plant Physiologists
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