Abstract
Although the fibers of cotton (Gossypium hirsutum L.) are single cells with a secondary wall composed primarily of cellulose, the cell-wall polymers of the fibers are technically difficult to characterize with respect to molecular weights. This limitation hinders understanding how the fiber wall composition changes during development, particularly with respect to genotypic variations, and how the molecular composition is related to physical properties. We analyzed cell-wall polymers from cotton fibers (cultivar, Texas Marker-1) at several developmental stages (8–60 days post-anthesis; DPA) by gel-permeation chromatography of components soluble in dimethyl acetamide and lithium chloride. This procedure solubilizes fiber cell-wall components directly without prior extraction or derivatization, processes that could lead to degradation of high-molecular-weight components. Cellwall polymers from fibers at primary cell-wall stages had lower molecular weights than the cellulose from fibers at the secondary wall stages; however, the high-molecularweight cellulose characteristic of mature cotton was detected as early as 8 DPA. High-molecular-weight material decreased during the period of 10–18 DPA with concomitant increase in lower-molecular-weight wall components, possibly indicating hydrolysis during the later stages of elongation.
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Abbreviations
- DMAC:
-
dimethyl acetamide
- DP:
-
degree of polymerization
- DPA:
-
days post anthesis
- GPC:
-
gel-permeation chromatography
- MW:
-
molecular weight
- MWD:
-
molecular-weight distribution
- TM-1:
-
Texas Marker 1
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Timpa, J.D., Triplett, B.A. Analysis of cell-wall polymers during cotton fiber development. Planta 189, 101–108 (1993). https://doi.org/10.1007/BF00201350
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DOI: https://doi.org/10.1007/BF00201350