Abstract: The present invention is directed to a method of Acacia mangium regeneration through organogenesis and a method of genetic transformation of Acacia mangium. The method of regeneration comprises inducing callus from different parts of seedlings and vegetatively micropropagated plantlets as explants; adventitious bud induction followed by pinnate leaf and bud elongation and eventually, elongated shoots were induced to root. Based on the regeneration system, a marker gene GUS under cauliflower mosaic virus promoter was introduced to Acacia mangium via Agrobacterium infection. GUS staining in the regenerated plants and Southern blot hybridization prove the incorporation of the foreign gene into the host genome and expression of the foreign gene.

Abstract: A novel gene, nacl, has been isolated from Arabidopsis. This gene encodes a protein (NACl) which has been identified as a member of the NAC family. NACl shares a high amino acid sequence homology with other members of the NAC gene products in the N-terminus. Data show that NACl belongs to a newly identified family of transcription factors. NACl is involved in the regulation of cotyledon and lateral root development. Overexpression of the gene can lead to larger plants with larger roots and more lateral roots than in wild-type plants.