Table 2 Calculated polysaccharide composition (mol%) of mature cotton fibre cell wall fractions based on monosaccharide linkage analysis (Table 1)
Relative proportion of polysaccharide in each fraction | Percentage of each polysaccharide across fractions | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Polysaccharide | Total | CDTA | Na2CO3 | 1 mol·L−1 KOH | 4 mol·L−1 KOH | Residue | CDTA | Na2CO3 | 1 mol·L−1 KOH | 4 mol·L−1 KOH | Residue |
Homogalacturonan | 1.0 (1.1) | 30.9 | 19.0 | 1.7 | 3.4 | 0.0 | 62.1 | 33.7 | 1.5 | 2.6 | 0.0 |
Rhamnogalacturonan I | 0.3 (0.1) | 2.7 | 1.9 | 1.3 | 1.2 | 0.0 | 50.0 | 31.3 | 10.1 | 8.6 | 0.0 |
Arabinan | 0.3 (0.3) | 9.1 | 4.0 | 1.0 | 1.0 | 0.0 | 67.5 | 26.5 | 3.2 | 2.8 | 0.0 |
Type I Arabinogalactan | 0.1 (0.1) | 1.4 | 1.4 | 0.6 | 0.5 | 0.0 | 45.4 | 40.4 | 7.8 | 6.5 | 0.0 |
Type II Arabinogalactan | 1.0 (1.0) | 31.5 | 12.2 | 1.8 | 0.7 | 0.0 | 72.7 | 24.8 | 1.8 | 0.6 | 0.0 |
Xyloglucan | 1.9 (0.4) | 0.3 | 2.8 | 0.8 | 41.9 | 0.0 | 1.7 | 12.8 | 1.9 | 83.6 | 0.0 |
Callose | 0.5 (0.4) | 1.3 | 7.6 | 16.1 | 0.3 | 0.0 | 8.3 | 44.3 | 46.7 | 0.7 | 0.0 |
Heteromannan | 2.8 (1.0) | 2.2 | 6.6 | 1.2 | 2.9 | 0.9 | 4.8 | 13.0 | 1.2 | 2.5 | 78.6 |
Glucuronoxylan | 1.2 (0.9) | 0.2 | 1.6 | 43.1 | 25.2 | 0.2 | 0.6 | 3.7 | 50.1 | 25.4 | 20.2 |
Cellulose | 90.4 (93.8) | 2.7 | 34.8 | 16.1 | 14.6 | 98.9 | 0.1 | 0.8 | 0.2 | 0.1 | 98.9 |
Other | 0.6 (0.8) | 17.6 | 7.9 | 16.3 | 8.2 | 0.0 | 50.5 | 19.9 | 20.6 | 9.0 | 0.0 |