The maize preligule band is subdivided into distinct domains with contrasting cellular properties prior to ligule outgrowth

Author:

Neher Wesley R.1ORCID,Rasmussen Carolyn G.12ORCID,Braybrook Siobhan A.34ORCID,Lažetić Vladimir2ORCID,Stowers Claire E.2,Mooney Paul T.2ORCID,Sylvester Anne W.2ORCID,Springer Patricia S.1ORCID

Affiliation:

1. Center for Plant Cell Biology, University of California 1 Department of Botany and Plant Sciences , , Riverside, CA 92521 , USA

2. University of Wyoming 2 Department of Molecular Biology , , Laramie, WY 82071 , USA

3. University of California 3 Department of Molecular, Cell, and Developmental Biology , , Los Angeles, CA 90095 , USA

4. California NanoSystems Institute 4 , Los Angeles, CA 90095 , USA

Abstract

ABSTRACT The maize ligule is an epidermis-derived structure that arises from the preligule band (PLB) at a boundary between the blade and sheath. A hinge-like auricle also develops immediately distal to the ligule and contributes to blade angle. Here, we characterize the stages of PLB and early ligule development in terms of topography, cell area, division orientation, cell wall rigidity and auxin response dynamics. Differential thickening of epidermal cells and localized periclinal divisions contributed to the formation of a ridge within the PLB, which ultimately produces the ligule fringe. Patterns in cell wall rigidity were consistent with the subdivision of the PLB into two regions along a distinct line positioned at the nascent ridge. The proximal region produces the ligule, while the distal region contributes to one epidermal face of the auricles. Although the auxin transporter PIN1 accumulated in the PLB, observed differential auxin transcriptional response did not underlie the partitioning of the PLB. Our data demonstrate that two zones with contrasting cellular properties, the preligule and preauricle, are specified within the ligular region before ligule outgrowth.

Funder

National Science Foundation

Office of Postsecondary Education

University of California

Publisher

The Company of Biologists

Subject

Developmental Biology,Molecular Biology

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