Abstract
Phosphate starvation constrains plant growth severely. To examine plant responses under phosphate deprived conditions, we carried out genome-wide gene expression analysis using Arabidopsis DNA array technology. Arabidopsis plants grown for 21 days in liquid medium were transferred to medium containing low concentrations of phosphate until 72 hours. Macro(JCAA) and micro(Agilent Tech., USA) DNA array carrying non-redundant 22,064 Arabidopsis genes were used for hybridization of mRNA isolated from the plants. Significant changes of transcripts were seen for 70 genes including AtPT2, and RNase1, SQD1 and SQD2. Induction of genes involved in glycolysis was also seen. Contrary, several photosynthesis genes and nuclear-encoded chloroplast targeted enzyme genes were down-regulated. Dynamic adaptation to phosphate deprivation in chloroplast and cytosol will be discussed.
