ESTs from the Fibre-Bearing Stem Tissues of Flax (Linum usitatissimum L.): Expression Analyses of Sequences Related to Cell Wall Development

Abstract

In order to learn more about the diversity of genes expressed during flax fibre cell wall formation, expressed sequence tags (ESTs) were obtained from a cDNA library derived from the outer fibre-bearing tissues of flax (Linum usitatissimum) stems (cv Hermes) harvested at the mid-flowering stage. After elimination of vector and unreadable sequences, 927 ESTs were grouped into 67 clusters and 754 singletons. The flax ESTs have been submitted to the dbEST and GenBank databases with the accession numbers 25939634 - 25940560 (dbEST) and CV478070 - CV478996 (GenBank). Functional analysis allowed the grouping of ESTs into 13 functional categories and revealed that 62 % of ESTs were similar to known sequences, while 12.4 % of ESTs presented no similarity to any known sequences and 25.6 % of ESTs corresponded to proteins of unknown function. The most highly expressed transcripts belonged to four functional categories: protein maturation and metabolism (31 ESTs), signalling (22 ESTs), the cell wall (21 ESTs) and photosynthesis (19 ESTs). 4.4 % (41) of the total ESTs were potentially related to cell wall formation and maturation. The most highly expressed cell wall EST (15 ESTs) corresponded to a β-xylosidase gene - potentially involved in cell wall remodelling during growth and development. Other cell wall-related ESTs corresponded to cellulose synthase, xyloglucan endotranglucosylase/hydrolase (XTH), β-galactosidases, and peroxidases. The expression patterns of different cell wall-related ESTs were determined at different developmental stages in flax plants grown under different field conditions. The potential roles of gene products associated with cell wall related ESTs in fibre cell wall development is discussed.

Key words

Fibres - flax - cell wall - expressed sequence tags (ESTs) - cellulose - hemicelluloses

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Editor: M. Hawkesford