BIO 2137 Lecture Notes - Lecture 12: Cell Membrane, Cell Wall, Eudicots
21 Jan 2021
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All plants have a primary cell wall outside their plasma membrane. Provide support and shape, but allows cell to grow in size. Is that a water will come into the cell and that primary cell wall will get bigger and bigger to a certain point before it gets hard. Deposited inside the primary cell wall after cell has stopped growing. Areas with thinner primary and no secondary cell wall = pits. Most abundant type of cell in most plants. Perform a variety of functions, such as food storage, photosynthesis, secretion, wound healing, etc. Elongated, unevenly thickened, non-lignified primary walls beneath epidermis in stems, petioles, and around veins in eudicots. Supporting tissue for growing stems, leaves, and floral parts, and for herbaceous organs that undergo little or no secondary growth. Have thick secondary cell walls that provide support to the plant. What we call fibers (like in hemp or jute) are bundles of long sclerenchyma cells.
