GOLVEN secretory peptides regulate auxin carrier turnover during plant gravitropic responses

Growth and development are coordinated by an array of i ntercellular communications. Known plant signaling molecules include phytohormones and hormone peptides. Although both classes can be implicated in the same developmen tal processes, little is known about the interplay between phytohormone action and peptide signaling within the cellular microenvironment. We show that genes coding fo r small secretory peptides, designated GOLVEN (GLV), modulate the distribution of the phytohormone auxin. The deregulation of the GLV function impairs the formation of auxin gradients and alters the reorientation of shoots and roots after a gravity stimulus. Specifically, the GLV signal modulates the trafficking dynamics of the auxi n efflux carrier PIN-FORMED2 involved in root tropic responses and meristem organization. Our work links the local action of secretory peptides with phytohormone trans port.

Whitford, R., Fernandez, A., Tejos, R., Cuellar Perez, A., Kleine-Vehn, J., Vanneste, S., Drozdzecki, A., Leitner, J., Abas, L., Aerts, M., Hoogewijs, K., Baster, P., De Groodt, R., Lin, Y.-C., Storme, V., Van de Peer, Y., Beeckman, T., Madder, A., Devreese, B., Luschnig, C., Friml, J., Hilson, P. (2012) GOLVEN secretory peptides regulate auxin carrier turnover during plant gravitropic responses. Dev. Cell 22,678-85.

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