Laboratory of Plant Cell Growth Mechanisms, Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky str., 2/31, 420111 Kazan, Russia.
Microscopy Cabinet, Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky str., 2/31, 420111 Kazan, Russia.
Plant Sci. 2022 Oct;323:111399. doi: 10.1016/j.plantsci.2022.111399. Epub 2022 Jul 26.
Intrusive growth is a type of growth in which a cell exceeds the growth rate of its neighbours and intrudes between them, reaching a much greater length. This process provides plant fibres with their exceptional length. Fibres are the most abundant cell type in the mechanical tissues of plants. At the same time, the plant fibres are of fundamental importance for the production of textiles, paper, biocomposites, etc. Here we describe a mutant of flax (reduced fibre 1, rdf) in which intrusive growth of fibres is impaired in both phloem and xylem. In addition to the intrinsic differences in fibre length, the mutant is characterized by a constitutive gravitropic response, mechanical aberrations at the macro- and nanolevels, disruption of the cambium and uneven transition of xylem cells to secondary cell wall formation. Gelatinous cell walls in both phloem and xylem of mutant plants have disturbed structure and reduced elasticity. The existence of this mutant-control pair offers both prospects for finding the molecular players involved in triggering intrusive growth, cell wall thickening and for understanding the principles of plant mechanical tissue functioning.
侵入式生长是一种细胞生长方式，其中一个细胞的生长速度超过其相邻细胞，并侵入它们之间，从而达到更长的长度。这个过程为植物纤维提供了它们非凡的长度。纤维是植物机械组织中最丰富的细胞类型。同时，植物纤维对于纺织品、纸张、生物复合材料等的生产具有重要意义。在这里，我们描述了一个亚麻突变体（减少纤维 1，rdf），其中韧皮部和木质部的纤维侵入式生长都受到了损害。除了纤维长度的内在差异外，该突变体还表现出组成性向重力反应、宏观和纳米级别的机械异常、形成层的破坏以及木质部细胞向次生细胞壁形成的不均匀转变。突变体植物韧皮部和木质部的凝胶状细胞壁结构紊乱，弹性降低。这个突变体-对照配对的存在为发现触发侵入式生长、细胞壁增厚的分子参与者以及理解植物机械组织功能的原理提供了前景。
