Associate Professor of Plant Biology
Ph.D. 1983, Michigan State University
Office: 313 Jeffords Hall
Research Area: cell wall structure, signaling pathways, control of gene expression
Courses Taught: Ethics in Graduate Research (PBIO 295); Introduction to Botany (PBIO 004); Genetics (BCOR 101); Cell & Molecular Biology (CMB 302); Graduate Seminar (MMG 310)
in root hairs
The dynamic character of the cell wall provides a mechanism(s) by which plants selectively modify their extracellular matrix as a consequence of growth and differentiation. My research group is interested in understanding the mechanisms through which structural proteins within the plant cell wall determining aspects of cell form and function during plant development.
in root hairs
We are currently studying a family of proline-rich cell wall proteins in Arabidopsis (AtPRPs) whose function is involved in tailoring the structure of the plant cell wall in root hairs and stomata. We have used promoter/reporter gene fusions in transgenic plants to show that the expression of individual AtPRPs is limited to these cell types and is linked to factors that control cell growth.
|Wild type root hairs||atprp3-1 mutant root hairs|
Studies in my lab have shown that each of the four ATPRPs is targeted to a specific region of the extracellular matrix, using immunohistochemistry. We have also identified knock-out mutants for each of these proteins. Null mutants for the two proteins expressed in root hairs (ATPRP1 and ATPRP3) present distinct root hair and whole plant phenotypes, suggesting that these proteins may serve different functions in organizing the structure of the primary cell wall. Future studies will focus on identifying changes in gene expression between wild type and mutant plants that would explain the developmental phenotypes observed in these mutants.
We have also identified regions within each of the AtPRPs that are sufficient for their targeted secretion to unique regions within root hair and guard cell walls. In the future, we are interested in identifying components of the secretory pathway that are responsible for these targeting mechanisms and which provide a mechanism for selectively tailoring domains of the extracellular matrix to support cell function.