Journal article
A chlorate-resistant mutant defective in the regulation of nitrate reductase gene expression in Arabidopsis defines a new HY locus
The Plant cell, Vol.9(1), pp.21-35
01/1997
DOI: 10.1105/tpc.9.1.21
PMCID: PMC156898
PMID: 9014362
Abstract
Light acts both directly as a signal and indirectly through photosynthesis to regulate the expression of genes encoding nitrate reductase (NR). Here, we report the isolation and characterization of a novel chlorate-resistant mutant that is defective in the regulation of NR gene expression. The response of NR2, but not NR1 or the gene encoding nitrate reductase (NiR), to light signals was impaired in this Arabidopsis mutant, designated cr88. In addition to NR2, the light regulation of the genes encoding the chlorophyll a/b binding protein (CAB) and the small subunit of ribulose bisphosphate carboxylase (RBCS) was also impaired in this mutant. These results suggest that the pathway through which light regulates the expression of NR2, CAB, and RBCS genes is different from those that regulate the expression of NR1 and NiR. An examination of the deetiolation process under different light spectrum showed that cr88 is defective in red light-mediated deetiolation. Complementation tests with various long hypocotyl (hy) mutants indicated that CR88 identifies a new HY locus. The possible functions of CR88 are discussed.
Details
- Title: Subtitle
- A chlorate-resistant mutant defective in the regulation of nitrate reductase gene expression in Arabidopsis defines a new HY locus
- Creators
- Y Lin - Department of Biological Sciences, University of Iowa, Iowa City 52242, USAC L Cheng - Department of Biological Sciences, University of Iowa, Iowa City 52242, USA
- Resource Type
- Journal article
- Publication Details
- The Plant cell, Vol.9(1), pp.21-35
- DOI
- 10.1105/tpc.9.1.21
- PMID
- 9014362
- PMCID
- PMC156898
- ISSN
- 1040-4651
- eISSN
- 1532-298X
- Language
- English
- Date published
- 01/1997
- Academic Unit
- Biology
- Record Identifier
- 9984217426702771
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