ABSTRACT
Members of the glycogen synthase kinase 3/SHAGGY-like protein kinase (GSK) family in plants are important regulators of stress response, development, and brassinosteroid signaling, and are highly homologous to animal GSKs. Several of the plant kinases are preferentially expressed during pollen development. We report the characterization of LpSK6, a member of the GSK family from the genus Lycopersicon. LpSK6 shows high sequence homology to members of group III, which contain a putative mitochondrial targeting peptide. LpSK6 is expressed 3 to 5 fold higher in anthers than in roots and stems, and is the first GSK gene isolated from genus Lycopersicon.