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. 1995 Jul;108(3):1013–1022. doi: 10.1104/pp.108.3.1013

Effects of light and chloroplast functional state on expression of nuclear genes encoding chloroplast glyceraldehyde-3-phosphate dehydrogenase in long hypocotyl (hy) mutants and wild-type Arabidopsis thaliana.

T R Conley 1, M C Shih 1
PMCID: PMC157451  PMID: 7630933

Abstract

In a previous study of Arabidopsis thaliana (J. Dewdney, T.R. Conley, M.-C. Shih, H.M. Goodman [1993] Plant Physiol 103: 1115-1121), it was postulated that both blue light receptor- and phytochrome-mediated pathways contribute to regulation of the nuclear genes encoding A and B subunits of glyceraldehyde-3-phosphate dehydrogenase (GAPA and GAPB). Here were report on the involvement of a nuclear gene encoding a putative blue-light receptor (HY4) and of a nuclear gene encoding phytochrome A apoprotein (PHYA) in regulation of the GAPA and GAPB genes in response to blue and far-red light. Continuous light irradiation experiments with the hy4 mutant demonstrate that the HY4 gene product is required for full expression of GAPA, GAPB, and one or more of the nuclear genes encoding small subunits of of ribulose-1,5-bisphosphate carboxylase/oxygenase. Continuous light irradiation and fluence-response studies with the phyA-101 mutant show that phytochrome A functions in far-red light regulation of GAPA, GAPB, nuclear genes encoding small subunits of ribulose-1,5-bisphosphate carboxylase/oxygenase, and CAB genes. Phytochromes A and B alone either do not participate in red light-mediated gene regulation or have redundant functions, as shown by analysis of phyA-101 and phyB-1 single mutants. In addition, the hypothesis that chloroplast-nucleus interactions affect GAPA and GAPB gene regulation was tested. Herbicide-mediated photooxidative damage to chloroplasts in A thaliana seedlings strongly decreased the maximum amount of GAPA and GAPB steady-state mRNA detected in continuous-light irradiation experiments. Full expression of the GAPB genes is dependent on the presence of functional chloroplasts.

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Selected References

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