Hormone signaling in plant development

Hormone signaling plays diverse and critical roles during plant development. In particular, hormone interactions regulate meristem function and therefore control formation of all organs in the plant. Recent advances have dissected commonalities and differences in the interaction of auxin and cytokinin in the regulation of shoot and root apical meristem function. In addition, brassinosteroid hormones have recently been discovered to regulate root apical meristem size. Further insights have also been made into our understanding of the mechanism of crosstalk among auxin, cytokinin, and strigolactone in axillary meristems.

► We review the latest findings on the role of hormones in development.
► Auxin and cytokinin play important roles in the shoot apical meristem, root apical meristem, and axillary meristems.
► Brassinosteroids also function in the root apical meristem.
► Hormone crosstalk involves regulation of hormone biosynthesis and transport.
► Transcription factors integrate hormone interactions to promote developmental responses.