This invention relates to an isolated nucleic acid fragment encoding an
auxin transport protein. The invention also relates to the construction
of a chimeric gene encoding all or a substantial portion of the auxin
transport protein, in sense or antisense orientation, wherein expression
of the chimeric gene results in production of altered levels of the auxin
transport protein in a transformed host cell. The present invention also
relates to methods using the auxin transport protein in modulating root
development, and in discovering compounds with potential herbicidal
activity.
