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Plant function and evolutionary biology
RESEARCH ARTICLE

Cellulosic fibres of flax recruit both primary and secondary cell wall cellulose synthases during deposition of thick tertiary cell walls and in the course of graviresponse

Natalia Mokshina A , Oleg Gorshkov A , Nadezda Ibragimova A , Tatyana Chernova A and Tatyana Gorshkova A B
+ Author Affiliations
- Author Affiliations

A Kazan Institute of Biochemistry and Biophysics of Kazan Scientific Centre of the Russian Academy of Sciences, Lobachevsky str., 2/31, Kazan, Russia 420111.

B Corresponding author. Email: gorshkova@kibb.knc.ru

Functional Plant Biology 44(8) 820-831 https://doi.org/10.1071/FP17105
Submitted: 1 October 2016  Accepted: 19 May 2017   Published: 4 July 2017

Abstract

Cellulose synthesising complex consists of cellulose synthase (CESA) subunits encoded by a multigene family; different sets of CESA genes are known to be expressed during primary and secondary cell wall formation. We examined the expression of LusCESAs in flax (Linum usitatissimum L.) cellulosic fibres at various stages of development and in the course of graviresponse by means of RNA-Seq and quantitative PCR. Transcripts for both primary and secondary cell wall-related CESAs were abundant in fibres depositing highly cellulosic tertiary cell walls. Gravistimulation of flax plants temporally increased the abundance of CESA transcripts, specifically in phloem fibres located at the pulling stem side. Construction of coexpression networks for LusCESAs revealed that both primary and secondary cell wall-related CESAs were involved in the joint coexpression group in fibres depositing tertiary cell walls, as distinct from other tissues, where these genes were within separate groups. The obtained data suggest that fibres depositing tertiary cell walls have a specific mechanism of cellulose biosynthesis and a specific way of its regulation.

Additional keywords: G-layer, gravitropic response, Linum usitatissimum L., plant fibres.


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