Protoxylem: the deposition of a network containing glycine-rich cell wall proteins starts in the cell corners in close association with the pectins of the middle lamella.
Antibodies were used to localise polysaccharide and protein networks in the protoxylem of etiolated soybean (Glycine max L.) hypocotyls. The deposition of glycine-rich proteins (GRPs) starts in the cell corners between protoxylem elements and xylem parenchyma cells. Finally, the GRPs form a network between two mature protoxylem elements. The network also interconnects the ring- and spiral-shaped secondary wall thickenings, as well as the thickenings with the middle lamellae of living xylem parenchyma cells. In addition to the GRP network, a polysaccharide network composed mainly of pectins is involved in the attachment of the secondary wall thickenings to the middle lamellae of xylem parenchyma cells.
Ryser
Ulrich
U
Biology Department, Plant Biology, University of Fribourg, 10 Chemin du Musée, 1700 Fribourg, Switzerland. ulrich.ryser@unifr.ch
D002473:Cell Wall / Q000378:metabolism*; D005455:Fluorescent Antibody Technique; D005936:Glucans; D018546:Hypocotyl / Q000378:metabolism* / Q000648:ultrastructure; D008854:Microscopy, Electron; D010368:Pectins / Q000378:metabolism*; D010940:Plant Proteins / Q000378:metabolism; D018514:Plant Structures / Q000378:metabolism* / Q000648:ultrastructure; D011134:Polysaccharides / Q000378:metabolism; D018160:Receptors, Cytoplasmic and Nuclear / Q000378:metabolism; D013025:Glycine max / Q000378:metabolism* / Q000648:ultrastructure; D014990:Xylans
D005936:Glucans; D010940:Plant Proteins; D011134:Polysaccharides; D018160:Receptors, Cytoplasmic and Nuclear; D014990:Xylans; C040985:phosphatidylinositol receptors; C042491:rhamnogalacturonan I; C029353:xyloglucan; D010368:Pectins; C003181:polygalacturonic acid