Abstract
The ASYMMETRIC LEAVES2 (AS2 ) gene of Arabidopsis encodes a plant specific protein with a domain that consists of a cysteine repeat, a conserved glycine residue and a leucine-zipper-like sequence in the amino-terminal half (AS2/LBD domain). AS2 belongs to a large family, AS2/LBD family, that contains other 41 genes (AS2/LBD genes) in Arabidopsis. Recently, it have been reported that some ASL/LBD genes are auxin response genes and ASL16/LBD29 and ASL18/LBD16 of these members function in formation of lateral root. Auxin is important not only in root development but also in shoot development. We analyzed auxin responsibility of expression of all ASL/LBD genes by RT-PCR. Expression of some ASL/LBD genes, including ASL23/LBD19 was induced by auxin. Transcript of ASL23/LBD19 was detected in shoot apex, young leaves, floral buds and root. Plants transformed ASL23/LBD19 RNAi showed abnormal phyllotaxy and flowers.
