Journal Article

Transcript Profiling During Fiber Development Identifies Pathways in Secondary Metabolism and Cell Wall Structure That May Contribute to Cotton Fiber Quality

Yves Al-Ghazi, Stéphane Bourot, Tony Arioli, Elizabeth S. Dennis and Danny J. Llewellyn

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 50, issue 7, pages 1364-1381
Published in print July 2009 | ISSN: 0032-0781
Published online June 2009 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/pcp/pcp084
Transcript Profiling During Fiber Development Identifies Pathways in Secondary Metabolism and Cell Wall Structure That May Contribute to Cotton Fiber Quality

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A global gene expression profiling study at different stages of fiber development was undertaken on two cotton species cultivated for fiber, Gossypium hirsutum (L.) and G. barbadense (L.). A large proportion of the genome was expressed during both fiber elongation and subsequent secondary cell wall thickening. There was a major shift in abundance of transcripts for gene regulation, cell organization and metabolism between fiber elongation and fiber thickening that was fundamentally similar in both species. Each stage had its own distinctive features represented by specific metabolic and regulatory genes, a number of which have been noted previously. Many of the genes expressed in the fibers were of a similar type and developmental expression to those seen in other fiber-producing plants, indicating a conservation of mechanisms of cell elongation and wall thickening across diverse plant genera. Secondary metabolism and pectin synthesis and modification genes were amongst the most statistically significant differentially expressed categories between the two species during fiber elongation. The gene profiles of the fiber thickening stage, however, were almost identical between the two species, suggesting that their different final fiber quality properties may be established at earlier stages of fiber development. Expression levels of repre-sentative phenylpropanoid and pectin modification genes showed high correlations with specific fiber properties in an inter-specific cotton recombinant inbred line (RIL) population, supporting a role in determining fiber quality.

Keywords: Cotton; Expression profiling; Fiber development; Fiber quality; Gossypium barbadense; Gossypium hirsutum; Microarray

Journal Article.  10383 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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