PL SC221 Lecture Notes - Lecture 1: Rutabaga, Celery, Rapeseed
14 Oct 2016
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Document Summary
Tissues of higher plants = made of eukaryotic cells > bound by a cell wall exterior of the plasmalemma (plasma membrane) Pectin = the glue that attaches the cell walls together. Area between cells = middle lamella (glue is deposited here) Non-living area = filled with ca and mg peculates (pectin complex set of polysaccharides) Middle lamella = important for fruit ripening. Pectinases/ polygalacturonases (ripening enzymes) secreted into here > breaks down pectine = fruit softening. Plasma membrane (semi-permeable) forms a continuum throughout the plant. Because plasmodesmata (pores) occur through the cell wall that allow a continuum of cytoplasm and membrane material from one cell to another (communication and nutrients) Symplast = continuum of living material > mineral and metabolites can be transported throughout the plant without ever leaving the cytoplasm (living material) Apoplast = non-living potions of plant tissues (ex. middle lamella, and dead xylem vessels) Cytoplasm of most plant cells occupies a small volume of the cell.
