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Model of the polysaccharide framework in a plant cell wall, generalized for polean and non-polean walls.1, Cellulose: cellulose microfibrils; 2–6, hemicelluloses: 2, xyloglucan; 3, mixed-linkage glucan; 4, xylan and related heteroxylans; 5, callose; 6, mannan and related heteromannans; 7–11, Pectins: 7, galactan; 8, arabinan; 9, homogalacturonan; 10, rhamnogalacturonan I; 11, rhamnogalacturonan II; 12, boron bridge; 13, ‘egg-box’ with calcium bridges; 14–16, Non-polysaccharide components: 14, enzymes and structural proteins; 15, cellulose synthase complex; 16, transport vesicles. (from Franková and Fry, Journal of Experimental Botany 64: 3519-3550, 2013) |