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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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