RNA-seq analysis of phloem fibers during gravitropic behaviour of flax plants

Restoration of stem vertical position after plant inclination is a widely spread version of plant orientation in accordance with gravity vector direction. Gravitropic behaviour of flax plants involves the formation of curvature in stem region that has ceased elongation long in advance of stem inclination. The important participants of such behaviour are phloem fibres with constitutively formed tertiary cell wall. We performed the large-scale transcriptome profiling of phloem fibres isolated from pulling and opposite sides of gravitropic curvature and compared with fibers of non-inclined plants. The aim of the present study was to characterise cellular processes occurring in fibres during gravitropic response by means of whole transcriptome characterisation and to figure out the regulatory systems that may mediate such processes.