Host: The Japanese Society of Plant Physiologists
Pages 0097
Auxin is synthesized primarily in young tissues, and is transported to other tissues by polar auxin transport where it is perceived by auxin receptors. Recent works on auxin transport and signaling showed how these two processes regulate plant development. However, it is still unclear how the genes related to auxin synthesis control plant development, because only a few genes related to auxin synthesis have been characterized in plants. Recently, we showed that the TRANSPORT INHIBITOR RESPONSE2 (TIR2)gene encodes the TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS protein required for converting Trp to indole-3-pyruvic acid, a precursor of auxin. We show evidence that auxin synthesized by TIR2 is essential for root meristem development. Furthermore, we show that the expression of the TIR2 gene was controlled differently by different signals suggesting that the TIR2 gene has different role in different plant development.
