Abstract
We performed microarray analysis with roots and rosette leaves of Arabidopsis thaliana which were exposed for one day to excess boron or deficient boron. When we compared gene induction ratios under each boron stress on each gene, there was positive relationship between these two inductions. On the other hand, there existed genes which are specifically upregulated by boron excess or boron deficiency. In roots, genes including At5g64170 were upregulated specifically by boron excess and genes including NIP5;1 were upregulated specifically by boron deficiency. In rosette leaves, genes including AtPT2 were upregulated specifically by boron excess and genes including At3g11340 were upregulated specifically by boron deficiency. Fifteen genes involved in senescence or defense response, which include WRKY6, were upregulated in rosette leaves by boron stresses. There were also boron-induced transcription factors. We are working with these genes to elucidate the mechanism of Arabidopsis to acclimatize to conditions with boron stresses.
