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Cell walls of seed hairs from Lygeum spartum: ultrastructure, composition and mechanical properties

Author:
Zeriahene, N., Prat, R., Goldberg, R., Catesson, A.M., Harche-Kaid, M.
Source:
Annals of botany 1998 v.81 no.1 pp. 61-66
ISSN:
0305-7364
Subject:
Poaceae, cell walls, provenance, polysaccharides, cellulose, cinnamic acid, arid zones, semiarid zones, mechanical properties, cytoplasm, testa, hemicellulose, chemical constituents of plants, Algeria
Abstract:
The silky hairs covering the whole surface of Lygeum spartum dispersal units are unicellular, unlignified epidermal structures whose length varies from 5 to 17 mm. The cell walls present a stratified texture after extraction of matrix material. Their composition depends on the geographical origin of the grasses. Polysaccharides extracted with boiling water represent approx. 18% of the cell wall dry matter in samples harvested in Algerian arid high-plateaus and only 3% in samples harvested in semi-arid coastal zones. In the latter case, hemicellulose and cellulose contents amounted to approx. 50 and 40%, respectively. Slightly lower values were found in high-plateau samples. Cinnamic acids were detected only in coastal region specimens which exhibited a higher mechanical resistance and a lower extensibility. These results support the existence of two distinct populations colonizing arid or semi-arid areas respectively.
Agid:
2560810