Abstract
Phosphorus in soil is often present in the forms of which plants are not easily accessible, such as organic phosphate and sparingly soluble inorganic phosphate. Plants exposed to low P alter the root architecture and mobilize these phosphates by secreting acid phosphatases and organic acids.
Arabidopsis thaliana has a worldwide distribution. Each accession should have adapted to each habitat with different low P responses and strategies to acquire phosphorus. However, low P responses of accessions grown on soil are not well known. In this study, P acquisition ability of each accession grown on soil was compared. In addition, accessions were grown on +P and -P medium to characterize their strategies against low P. Accessions were grown on soil under 3 different P conditions and shoot dry mass and shoot phosphate contents were measured. Each accession exhibited different characteristics. The shoot growth and P content increased under more P sufficient condition in most of the accessions but some exhibited a reduction in both growth and P content under the 300 mg P/kg-soil condition. In order to better characterize each low P response, 32 accessions were categorized into groups.
