Hormone transport in plants deciphered

http://phys.org/news/2014-02-roots-hormone-deciphered.html#jCp

"Plant growth is orchestrated by a spectrum of signals from hormones within a plant. A major group of plant hormones called cytokinins originate in the roots of plants, and their journey to growth areas on the stem and in leaves stimulates plant development. Though these phytohormones have been identified in the past, the molecular mechanism responsible for their transportation within plants was previously poorly understood."

Blue staining shows the distribution of the root-synthesized cytokinins. Knocking out the transporter gene impairs their translocation to leaves (right). Credit: Brookhaven National Laboratory