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Specification of bundle sheath cell fates during maize leaf development: roles of lineage and positional information evaluated through analysis of the tangled1 mutant

Julia P. Jankovsky^1,, Laurie G. Smith² and Timothy Nelson^1,*

¹ Department of Molecular, Cellular and Developmental Biology, Yale University, PO Box 208104, New Haven CT 06520, USA
² Section of Cell and Developmental Biology, University of California, San Diego, La Jolla, CA 92093, USA
Present address: Tufts School of Veterinary Medicine, North Grafton, MA, USA

*Author for correspondence (e-mail: timothy.nelson{at}yale.edu)

Accepted April 16, 2001

In leaves of the maize tangled1 (tan1) mutant, clusters of bundle sheath (BS)-like cells extend several cells distant from the veins, in association with the single layer of BS cells around the vein. We show that the BS-like cell clusters in tan1 leaves result from the continued division of cells in the procambial/BS cell lineage that do not divide further in wild-type leaves. The ectopic BS-like cells accumulate the BS marker NADP-dependent malic enzyme but not the mesophyll cell marker phosphoenolpyruvate carboxylase, and exhibit thickened walls, suggesting that they differentiate as C4-type BS cells. We propose that bundle sheath cell fate can be conferred on some derivatives of procambial cell divisions in a manner that is heritable through multiple cell divisions and is position-independent.

Key words: Maize, tangled1, Bundle sheath cell, Cell fate

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