|
Cell wall integrity signalling in Arabidopsis thaliana |
| |
|
Thorsten Hamann and
Chris Somerville |
|
Dept. of Plant Biology, Carnegie Institution of Washington, 260 Panama Street, Stanford
94305, CA, USA |
| *email:
|
| |
|
Signalling mechanisms coordinating interaction between the cell wall and the plant cell
are crucial in several different biological contexts such as (a)biotic stress response, cell wall
polysaccharide biosynthesis and cell morphogenesis. Over the last years evidence has surfaced that hints at
the existence of a mechanism monitoring cell wall integrity. Both ethylene and jasmonic acid signalling
mechanisms have been implicated while lignin and pectin biosynthetic processes are apparently downstream
targets. We have performed expression profiling experiments monitoring the transcriptional response to cell
wall stress caused by inhibition of cellulose biosynthesis through the herbicide isoxaben. One of the genes
responding very strongly on the transcriptional level encodes a putative glutamate receptor protein
(GLR). Homozygous mutant seedlings for this GLR exhibit cell wall defects and reduced
lignification upon treatment with isoxaben. We will present our results regarding the biological function of
this receptor. |
