Abstract
Polyamines (PA) are small polycations observed in various organisms such as bacteria, plants and animals. Putrescine, spermidine and spermine are the most abundant polyamines in plants. Genetic analyses using series of Arabidopsis mutants of PA biosynthetic genes have helped to clarify the PA function for a variety of physiological processes such as stress response, seed development and stem elongation. In this study, we analyzed a candidate protein involved in Arabidopsis Polyamine Transport system (AtPTP) and characterized the atptp mutant. The atptp leaf showed albino phenotype and the atptp seed was dark brown and shriveled. We are performing the domain analysis of the AtPTP protein, and discuss the physiological roles of AtPTP for plant development.
