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Plant Physiol, October 2000, Vol. 124, pp. 805-812
Changes in Gibberellin A1 Levels
and Response during De-Etiolation of Pea Seedlings1
Damian P.
O'Neill,
John J.
Ross, and
James B.
Reid*
School of Plant Science, University of Tasmania, G.P.O. Box 252C,
Hobart, Tasmania 7001, Australia
The level of gibberellin A1 (GA1) in shoots
of pea (Pisum sativum) dropped rapidly during the first
24 h of de-etiolation. The level then increased between 1 and
5 d after transfer to white light. Comparison of the metabolism of
[13C3H] GA20 suggested that the
initial drop in GA1 after transfer is mediated by a
light-induced increase in the 2 -hydroxylation of GA1 to
GA8. A comparison of the elongation response to
GA1 at early and late stages of de-etiolation provided
strong evidence for a change in GA1 response during
de-etiolation, coinciding with the return of GA1 levels to
the normal, homeostatic levels found in light- and dark-grown plants.
The emerging picture of the control of shoot elongation by light
involves an initial inhibition of elongation by a light-induced
decrease in GA1 levels, with continued inhibition mediated
by a light-induced change in the plant's response to the endogenous
level of GA1. Hence the plant uses a change in hormone
level to respond to a change in the environment, but over time,
homeostasis returns the level of the hormone to normal once the ongoing
change in environment is accommodated by a change in the response of
the plant to the hormone.
1
This work was supported by the Australian
Research Council.
*
Corresponding author; e-mail Jim.Reid{at}utas.edu.au; fax
61-362-262698.
© 2000 American Society of Plant Physiologists
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