Auxin acts as a local morphogenetic trigger to specify lateral root founder cells
Por:
Dubrovsky J.G., Sauer M., Napsucialy-Mendivil S., Ivanchenko M.G., Friml J., Shishkova S., Celenza J., Benková E.
Publicada:
24 jun 2008
Categoría:
Multidisciplinary
Resumen:
Plants exhibit an exceptional adaptability to different environmental conditions. To a large extent, this adaptability depends on their ability to initiate and form new organs throughout their entire postembryonic life. Plant shoot and root systems unceasingly branch and form axillary shoots or lateral roots, respectively. The first event in the formation of a new organ is specification of founder cells. Several plant hormones, prominent among them auxin, have been implicated in the acquisition of founder cell identity by differentiated cells, but the mechanisms underlying this process are largely elusive. Here, we show that auxin and its local accumulation in root pericycle cells is a necessary and sufficient signal to respecify these cells into lateral root founder cells. Analysis of the alf4-1 mutant suggests that specification of founder cells and the subsequent activation of cell division leading to primordium formation represent two genetically separable events. Time-lapse experi
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Biotecnol, Cuernavaca 62250, Morelos, Mexico
Department of Plant Systems Biology, Vlaams Instituut voor Biotechnologie, Gent University, Technologiepark 927, 9052 Gent, Belgium
Department of Botany and Plant Pathology, Oregon State University, 2082 Cordley Hall, Corvallis, OR 97331, United States
Department of Biology, Boston University, Boston, MA 02215, United States
All Open Access, Bronze
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