Structure Analysis of INNER NO OUTER (INO) Homologs in Capsicum Species

Abstract

The plant transcription factor INNER NO OUTER (INO) plays a major role in development of the outer integument of bitegmic ovules. INO sequences of ten Capsicum species were identified. Levels of nucleotide and amino acid variability in Capsicum INO were determined, and 18 amino acid residue substitutions localized in the YABBY domain and in the interdomain region were revealed. The ZnF domain was invariant in all the analyzed Capsicum species. In the constructed dendrogram, all the Capsicum species form a single cluster in the INO clade, the basal branches to which are formed by the INO proteins of the Solanum and Nicotiana species.