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The Expression of Light-Regulated Genes in the
High-Pigment-1
Mutant of Tomato1
Janny L. Peters2, *,
Márta Széll2, and
Richard E. Kendrick
Laboratory for Photoperception and Signal Transduction, Frontier
Research Program, Institute of Physical and Chemical Research (RIKEN),
Hirosawa 2-1, Wako-shi, Saitama, 351-0198 Japan
Three
light-regulated genes, chlorophyll a/b-binding protein
(CAB), ribulose-1,5-bisphosphate carboxylase/oxygenase
small subunit, and chalcone synthase (CHS), are
demonstrated to be up-regulated in the high-pigment-1
(hp-1) mutant of tomato (Lycopersicon
esculentum Mill.) compared with wild type (WT). However, the
pattern of up-regulation of the three genes depends on the light
conditions, stage of development, and tissue studied. Compared with WT,
the hp-1 mutant showed higher CAB gene
expression in the dark after a single red-light pulse and in the
pericarp of immature fruits. However, in vegetative tissues of
light-grown seedlings and adult plants, CAB mRNA
accumulation did not differ between WT and the hp-1
mutant. The ribulose-1,5-bisphosphate carboxylase/oxygenase small
subunit mRNA accumulated to a higher level in the
hp-1 mutant than WT under all light conditions and tissues studied, whereas CHS gene expression was
up-regulated in de-etiolated vegetative hp-1-mutant
tissues only. The CAB and CHS genes were
shown to be phytochrome regulated and both phytochrome A and B1 play a
role in CAB gene expression. These observations support
the hypothesis that the HP-1 protein plays a general repressive role in
phytochrome signal transduction.
1
This work was supported by a Science and
Technology Agency fellowship of the Japan International Science and
Technology Exchange Center to J.L.P.
2
These two authors contributed
equally to this paper.
*
Corresponding author; e-mail peters{at}postman.riken.go.jp; fax
81-48-462-9405.
Plant Physiol. (1998) 117: 797-807
Copyright Clearance Center: 0032-0889/98/117/0797/11
© 1998 American Society of Plant Physiologists
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