BIO203H5 Lecture Notes - Lecture 2: Symplast, Meristem, Vacuole
Document Summary
Plant cells are connected to one another, they form a mosaic of cells joined by the plasmodesmata. The cells joined in this wau form one connected entity called a symplast. Movement of material through plasmodesmata is called symplastic movement. Secondary cell walls have gaps not continuous called pits. A central rod of constricted endoplasmic reticulum= desmotubule. Desmotubule surrounded by cytoplasmic sleeve, a channel of cytoplasms. Globular proteins create smaller channels in cytoplasmic sleeve, they can also help the central rod kept in place: vacuole, chlorplast. Meristems: responsible for adding to new cells by keep dividing as the plant grows and adding new cells. Growth = cell division + cell expansion (elongation of cells more important) Meristems are sites of active cell division. They are groups of embryonic cells which continue to divide and form new cells as the plant develops.
