PLSC 220 Lecture Notes - Lecture 1: Phyllotaxis, Phloem, Guttation
Document Summary
Always on the external part of the root or the stem. Parenchyma cells - one of the most abundant cells in the plants, it is thin walled. Collenchyma- similar to parenchyma but function in support. Sclerenchyma- like collenchyma but thicker walls, not exible. Phloem is modi es storage organs that hold a lot of sugars and starches. Girdling - this is why deer and rabbit eat the plants. Conducts water, minerals from roots to the rest of the plant. Higher qualities storage cells due to our growing season and temperatures. The leafs load the phloem with sugar, when theres so many sugar molecules it decreases the concentration of water and creates a lot of hydrostatic pressure which forces the solutes and water down. There is sink cells consuming the sucrose ( solutes ). When the water gets to the bottom it moves over to the transpiration stream and starts all over again.
