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Plant Physiol, September 2000, Vol. 124, pp. 423-430
Regulation of Transcript Levels of a Potato Gibberellin
20-Oxidase Gene by Light and Phytochrome B1
Stephen D.
Jackson,*
Pat E.
James,
Esther
Carrera,
Salomé
Prat, and
Brian
Thomas
Horticulture Research International, Wellesbourne, Warwick CV35
9EF, United Kingdom (S.D.J., P.E.J., B.T.); and Centro de Investigacion
y Desarrollo, Consejo Superior de Investigaciones
Científicas, Jordi Girona 18-26, E 08034 Barcelona, Spain (E.C., S.P.)
Up to three gibberellin (GA) 20-oxidase genes have now been
cloned from several species including Arabidopsis, bean
(Phaseolus vulgaris), and potato (Solanum
tuberosum). In each case the GA 20-oxidase genes exhibit
different patterns of tissue expression. We have performed extensive
northern analysis on one of the potato GA 20-oxidase genes
(StGA20ox1), which is the only one that shows significant transcript levels in leaves. We show that levels of StGA20ox1 transcript are elevated in transgenic
antisense plants that have reduced levels of phytochrome B (PHYB)
compared with wild-type plants, implicating PHYB in the control of GA
biosynthesis. We show that StGA20ox1 transcript levels
vary in leaves of different age throughout the plant and cycle
throughout the day, furthermore they are up-regulated by light and
down-regulated in the dark. The degree of the response to the light-on
signal is similar in potato plants deficient in phytochrome A or
PHYB and wild-type plants. The induction of
StGA20ox1 by blue light raises the possibility that a
blue light receptor may be involved in the control of this gene by light.
1
This work was supported by the Biotechnology and
Biological Science Research Council and the Comision Interministerial
de Ciencia y Tecnologia Plan Nacional (grant no.
BIO96-0532-C02-02).
*
Corresponding author; e-mail stephen.jackson{at}hri.ac.uk; fax
44-1789-470552.
© 2000 American Society of Plant Physiologists
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