Host: The Japanese Society of Plant Physiologists
Pages 049
Sulfur responses in higher plants have been well studied. Most of the proteins and compounds which function in the sulfate assimilation pathway have been characterized, However, the mechanisms to sense or regulate sulfur status are not understood although some are known in other organisms. In this study, we focused on Sac3 identified as a sulfur regulator in Chlamydomonas reinhardtii. We studied one of ten Sac3 homologs in Arabidopsis thaliana to determine if the gene is involved in sulfur response in higher plants as well. Two independent T-DNA inserted mutants in the relevant gene did not induce the increased accumulation of sulfate transporter Sultr2;2 mRNA under sulfur deficiency. Furthermore, under the deficiency, the O-acetyl-L-serine level was elevated in the mutants compared to the wild type. These results suggest that this gene is involved in sulfur response and that the mechanism of sulfur regulation may be conserved between these two different species.
