Expression of auxin transporter genes in flax (Linum usitatissimum) fibers during gravity response.

Gravitropism is an adaptive reaction of plants associated with the ability of various plant organs to be located and to grow in a certain direction relative to the gravity vector, while usually the asymmetric distribution of the phytohormone auxin is a necessary condition for the gravitropical bending of plant organs. Earlier, we described significant morphological changes in phloem fibers with a thickened cell wall located on different sides of the stem in the area of the gravitropic curvature. The present study is the first work devoted to the identification of genes encoding auxin transporters in cells at different stages of development and during gravity response.

Transcriptome profiling of celery petiole tissues reveals peculiarities of the collenchyma cell wall formation.

Transcriptome and biochemical analyses are applied to individual plant cell types to reveal potential players involved in the molecular machinery of cell wall formation in specialized cells such as collenchyma. Plant collenchyma is a mechanical tissue characterized by an irregular, thickened cell wall and the ability to support cell elongation. The composition of the collenchyma cell wall resembles that of the primary cell wall and includes cellulose, xyloglucan, and pectin; lignin is absent.

Using FIBexDB for In-Depth Analysis of Flax Lectin Gene Expression in Response to Infection.

Plant proteins with lectin domains play an essential role in plant immunity modulation, but among a plurality of lectins recruited by plants, only a few members have been functionally characterized. For the analysis of flax lectin gene expression, we used FIBexDB, which includes an efficient algorithm for flax gene expression analysis combining gene clustering and coexpression network analysis. We analyzed the lectin gene expression in various flax tissues, including root tips infected with .

Gene Expression Patterns for Proteins With Lectin Domains in Flax Stem Tissues Are Related to Deposition of Distinct Cell Wall Types.

The genomes of higher plants encode a variety of proteins with lectin domains that are able to specifically recognize certain carbohydrates. Plants are enriched in a variety of potentially complementary glycans, many of which are located in the cell wall. We performed a genome-wide search for flax proteins with lectin domains and compared the expression of the encoding genes in different stem tissues that have distinct cell wall types with different sets of major polysaccharides.