Fig. 7.

Xyloglucan endoglucanase (XEG) digestion products of hemicellulose B from numerous monilophytes and three other vascular plants. The TLCs were developed in butanol/acetic acid/water, and stained with thymol. Markers (labelled at left): Gal, galactose; GalA, galacturonic acid; XXXG, XXLG and XLLG, oligosaccharides of DP 7, 8 and 9, respectively, from tamarind xyloglucan. Size-classes of products (labelled at right) are indicated by their degree of polymerization (DP); e.g. DP7 is a heptasaccharide. DP9^F, Nonasaccharides containing a fucose residue; DP9^NF, lacking fucose. One residue of fucose (6-deoxy-l-galactose) considerably increases chromatographic mobility compared with an oligosaccharide of similar size lacking a deoxy-sugar. The DP9^F band is highlighted with a yellow stripe. Abbreviations: M, mature tissue; Y, young tissue.