Table 1.
Cell wall composition of cotton stem xylem, stem pith, and seed fibres
| XYLM | PITH | SF07 | SF15 | SF25 | |
|---|---|---|---|---|---|
| Homogalacturonan | 1.0 ± 0.1 | 4.0 ± 0.6 | 19.7 ± 5.0 | 13.7 ± 0.5 | 0.7 ± 0.4 |
| Rhamnogalacturonan | 0.6 ± 0.1 | 0.9 ± 0.02 | 4.3 ± 1.3 | 4.8 ± 0.2 | 0.4 ± 0.1 |
| Arabinan | 0.5 ± 0.2 | 0.7 ± 0.1 | 15.1 ± 1.8 | 8.6 ± 0.1 | 0.2 ± 0.1 |
| Type I AG | 0.3 ± 0.02 | 0.5 ± 0.1 | 2.9 ± 0.3 | 2.9 ± 0.1 | 0.1 ± 0.02 |
| Type II AG | 0.6 ± 0.1 | 0.4 ± 0.1 | 8.2 ± 0.2 | 8.2 ± 0.01 | 0.9 ± 0.01 |
| Heteroxylan | 27.6 ± 4.3 | 19.8 ± 7.1 | 2.9 ± 1.1 | 1.7 ± 0.1 | 0.6 ± 0.1 |
| Callose | 0.1 ± 0.001 | 0.1 ± 0.05 | 2.1 ± 0.5 | 12.2 ± 0.9 | 8.7 ± 2.5 |
| Heteromannan | 3.4 ± 0.5 | 2.8 ± 0.1 | 5.6 ± 0.3 | 5.6 ± 0.4 | 1.4 ± 0.02 |
| Xyloglucan | 4.8 ± 0.6 | 4.1 ± 0.7 | 9.5 ± 1.4 | 10.6 ± 0.7 | 1.4 ± 0.5 |
| Cellulose | 61.0 ± 5.9 | 66.7 ± 7.3 | 23.4 ± 0.1 | 29.2 ± 0.5 | 85.6 ± 3.4 |
| Others | tr | tr | 6.4 ± 0.2 | 2.6 ± 0.5 | tr |
| 4-GalA DE | 42.5 ± 3.5 | 51.0 ± 5.7 | 49.0 ± 5.7 | 42.5 ± 3.5 | 20.0 ± 0.00 |
Polysaccharide composition of cell walls deduced from linkage analysis of cotton stem xylem (XYLM), stem pith (PITH), and 7, 15, and 25 DPA seed fibre (SF07, SF15, SF25) in mol%. Mean values ± SD are shown (n = 2). AG, arabinogalactan; 1,4-GalA DE, (1,4)-linked galacturonic acid degree of esterification, tr, <0.05 mol%