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PMID:19077168
| Citation |
Kim, BH and von Arnim, AG (2009) FIERY1 regulates light-mediated repression of cell elongation and flowering time via its 3'(2'),5'-bisphosphate nucleotidase activity. Plant J. 58:208-19 |
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| Abstract |
Light is one of the most important environmental factors that regulate plant development. Here we report that a mutation in the Arabidopsis FIERY1 gene (FRY1) caused a shortened hypocotyl and shorter petioles, most dramatically under low-intensity red light and less pronounced under far-red and blue-light conditions. Furthermore, the fry1 mutant flowered late, probably due to a reduced level of FLOWERING LOCUS T (FT) transcript. However, although the transcript level of FRY1 was light-regulated, the chlorophyll level and the expression of typical light-regulated genes were not affected in the fry1 mutant. FRY1 is known as a regulator of abiotic stress responses, and its protein product has dual enzymatic activity comprising inositol polyphosphate-1-phosphatase and 3'(2'),5'-bisphosphate nucleotidase activity. Genetic complementation data obtained using cDNA of the FRY1 paralog AHL (Arabidopsis HAL2-like) and the similar phenotype of an xrn2/xrn3 double mutant suggest that FRY1 attenuates light responses via its 3'(2'),5'-bisphosphate nucleotidase activity rather than its inositol polyphosphate-1-phosphatase activity. We discuss the relationship between the FRY1-associated nucleotidase activity, a step in the pathway for sulfur metabolism and utilization, and the Arabidopsis light response. |
| Links |
PubMed Online version:10.1111/j.1365-313X.2008.03770.x |
| Keywords |
Arabidopsis/enzymology; Arabidopsis/genetics; Arabidopsis/growth & development; Arabidopsis Proteins/genetics; Arabidopsis Proteins/metabolism; Cell Enlargement; Chlorophyll/metabolism; Flowers/genetics; Flowers/growth & development; Gene Expression Regulation, Plant; Genes, Plant; Genetic Complementation Test; Light; Mutagenesis, Insertional; Nucleotidases/genetics; Nucleotidases/metabolism; Phytochrome B/metabolism; Plants, Genetically Modified/enzymology; Plants, Genetically Modified/genetics; Plants, Genetically Modified/growth & development; RNA, Plant/genetics |
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Significance
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