The Lamportian cell wall

Conference · Wed May 01 04:00:00 EDT 1991 · Plant Physiology, Supplement; (United States)

OSTI ID:5601146

Keiliszewski, M; Lamport, D ^[1]

---

1. Michigan State Univ. Plant Research Lab., East Lansing (United States)

The Lamportian Warp-Weft hypothesis suggests a cellulose-extensin interpenetrating network where extensin mechanically couples the load-bearing cellulose microfibrils in a wall matrix that is best described as a microcomposite. This model is based on data gathered from the extensin-rich walls of tomato and sycamore cell suspension culture, wherein extensin precursors are insolubilized into the wall by undefined crosslinks. The authors recent work with cell walls isolated from intact tissue as well as walls from suspension cultured cells of the graminaceous monocots maize and rice, the non-graminaceous monocot asparagus, the primitive herbaceous dicot sugar beet, and the gymnosperm Douglas Fir indicate that although extensins are ubiquitous to all plant species examined, they are not the major structural protein component of most walls examined. Amino acid analyses of intact and HF-treated walls shows a major component neither an HRGP, nor directly comparable to the glycine-rich wall proteins such as those associated with seed coat walls or the 67 mole% glycine-rich proteins cloned from petunia and soybean. Clearly, structural wall protein alternatives to extensin exist and any cell wall model must take that into account. If we assume that extracellular matrices are a priori network structures, then new Hypless' structural proteins in the maize cell wall raise questions about the sort of network these proteins create: the kinds of crosslinks involved; how they are formed; and the roles played by the small amounts of HRGPs.

• OSTI ID: 5601146
• Report Number(s): CONF-9107184--
• Conference Information: Journal Name: Plant Physiology, Supplement; (United States) Journal Volume: 96:1
• Country of Publication: United States
• Language: English

Related Subjects

551000* -- Physiological Systems
59 BASIC BIOLOGICAL SCIENCES
AMINO ACIDS
BEETS
CARBOHYDRATES
CARBOXYLIC ACIDS
CELL CONSTITUENTS
CELL CULTURES
CELL WALL
CELLULOSE
CEREALS
CHEMICAL REACTIONS
CONIFERS
CROSS-LINKING
FIRS
FOOD
GLYCINE
GRAMINEAE
LILIOPSIDA
MAGNOLIOPHYTA
MAGNOLIOPSIDA
MAIZE
ORGANIC ACIDS
ORGANIC COMPOUNDS
PHYSIOLOGY
PINOPHYTA
PLANT CELLS
PLANTS
POLYMERIZATION
POLYSACCHARIDES
PROTEIN STRUCTURE
RICE
SACCHARIDES
SUGAR BEETS
TREES
VEGETABLES