Plant Cell Wall

Lignocellulosic biomass refers to plant biomass. All plant cells are surrounded by an extracellular matrix known as the cell wall, a polysaccharide-rich matrix which is a major component of terrestrial plants. The plant cell wall is a composite structure and is divided into three layers; the middle lamella, the primary wall and the secondary wall (Carpita and Gibeaut 1993; Somerville et al. 2004) (Figs. 4.1 and 4.2). The middle lamella is the most external of all three layers and acts as a separating panel between two cells (Heredia et al. 1995). It is composed mainly of pectic substances and is the first boundary component to be formed by the cell during cytoplasmic division (Heredia et al. 1995; Hernon et al. 2010). The primary and secondary cell walls differ in function and in composition.

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