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Meristem-Specific Suppression of Mitosis and a Global Switch in Gene Expression in the Root Cap of Pea by Endogenous Signals1

Lindy A. Brigham, Ho-Hyung Woo, Fushi Wen, and Martha C. Hawes*

Departments of Plant Pathology and Molecular and Cellular Biology, 204 Forbes Building, University of Arizona, Tucson, Arizona 85721

Two functionally distinct sets of meristematic cells exist within root tips of pea (Pisum sativum): the root apical meristem, which gives rise to the body of the root; and the root cap meristem, which gives rise to cells that differentiate progressively through the cap and separate ultimately from its periphery as border cells. When a specific number of border cells has accumulated on the root cap periphery, mitosis within the root cap meristem, but not the apical meristem, is suppressed. When border cells are removed by immersion of the root tip in water, a transient induction of mitosis in the root cap meristem can be detected starting within 5 min. A corresponding switch in gene expression throughout the root cap occurs in parallel with the increase in mitosis, and new border cells begin to separate from the root cap periphery within 1 h. The induction of renewed border cell production is inhibited by incubating root tips in extracellular material released from border cells. The results are consistent with the hypothesis that operation of the root cap meristem and consequent turnover of the root cap is self-regulated by a signal from border cells.

1   This work was supported by grants from the U.S. Department of Education, the U.S. Department of Agriculture, Pioneer Seed, and the Storkan-Hanes Foundation.
*   Corresponding author; e-mail mhawes{at}u.arizona.edu; fax 1-520-621-9290.

Plant Physiol. (1998) 118: 1223-1231
Copyright Clearance Center:   0032-0889/98/118//09
© 1998 American Society of Plant Physiologists




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