Plants, like animals, regulate their growth and development using hormone signals. The hormone auxin plays a critical role throughout the plant life cycle, regulating key processes such as embryo patterning, root branching, shoot phyllotaxis and floral development. Auxin is also crucial for regulating plant adaptive responses to environmental signals such as changes in the direction of light, gravity or water (collectively termed tropisms). Auxin therefore functions as a master regulator of plant growth and development (Figure 1). Given this role, determining where and when auxin accumulates in plant tissues is of paramount importance. In this article, we describe how plants control auxin distribution employing a specialized transport mechanism.

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