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Abstract Detail


Cytoskeleton Structure and Dynamics

Humphries, John A [1], Cartwright, Heather N [2], Smith, Laurie G [3].

Asymmetric cell division in maize stomata.

Asymmetric cell division is a critical component of numerous processes in plant development. In maize, asymmetric divisions involving polarization of the mother cell before division are vital for the formation of the stomata. The maize stomata is a complex comprising four cells; a central guard cell pair flanked by two subsidiary cells. During the development of the stomata, two subsidiary mother cells (SMCs) are recruited into the complex by the guard mother cell (GMC), and subsequently divide asymmetrically to each produce a subsidiary cell and an unspecialized pavement cell. A mutator screen has been carried out to identify genes which participate in epidermal cell patterning in the maize leaf, and a gene designated pangloss1 (pan1) appearing to play a role in SMC division has been identified. Characterization of the pan1 mutant phenotype has revealed altered actin localization and depolarization of the nucleus in the SMC, leading to subsidiary cell defects. The pan1 gene has been cloned, and encodes a putative leucine-rich repeat receptor-like kinase (LRR-RLK). LRR-RLKs comprise the largest class of plant receptor kinases, and are known to regulate a wide variety of processes. To obtain further information of the role of pan1 in the polarization of maize SMCs, an analysis of pan1 activity and expression has been performed.


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1 - University of California, San Diego, Section of Cell and Developmental Biology, 9500 Gilman Drive, La Jolla, CA, 92093, USA
2 - Stowers Institute for Medical research
3 - University of California, San Diego, Section of Cell and Developmental Biology

Keywords:
stomata
maize
asymmetric cell division.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P23011
Abstract ID:1819


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