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A Spatial Accommodation by Neighboring Cells Is Required for Organ Initiation in Arabidopsis
Ist Teil von
Science (American Association for the Advancement of Science), 2014-01, Vol.343 (6167), p.178-183
Ort / Verlag
United States: American Association for the Advancement of Science
Erscheinungsjahr
2014
Link zum Volltext
Quelle
American Association for the Advancement of Science
Beschreibungen/Notizen
Lateral root formation in plants can be studied as the process of interaction between chemical signals and physical forces during development. Lateral root primordia grow through overlying cell layers that must accommodate this incursion. Here, we analyze responses of the endodermis, the immediate neighbor to an initiating lateral root. Endodermal cells overlying lateral root primordia lose volume, change shape, and relinquish their tight junction-like diffusion barrier to make way for the emerging lateral root primordium. Endodermal feedback is absolutely required for initiation and growth of lateral roots, and we provide evidence that this is mediated by controlled volume loss in the endodermis. We propose that turgidity and rigid cell walls, typical of plants, impose constraints that are specifically modified for a given developmental process.