Node is associated with the cell cytoplasm in the cell cytoplasm side. Node has a variety of sizes and structures between them.
1. Primary Node is a thin section on the wall that is penetrated by cytoplasmic threads fine or plasmodesmata. Node always in pairs, each pair of nodes has a space Node and Node membrane.
2. Simple Node that is the secondary wall dots which ends just at the edge of the basin formed by the primary node field. The combination of two simple nodes called simple Node pairs.
3. Protected Node is a Node that exceeds the secondary dindig edge node basin primary field so that there is a section specially protected or trimmed.
4. Node is a Node half shielded shielded on one side and on the other side is not protected. For example Node contained in the xylem.
5. Node is aspirated nodes that do not function in transport. This happens because the center of the membrane becomes thicker dots and form a torus, while the other part of the margo structure is open so that the matrix of non-cellulose in primary walls and middle lamela lost, resulting margo margo is flexible and when under stress, it will move to one side of the edge Node, thereby closing the hole with a torus Node. For example in trakeid gymnosperms, especially Pinaceae.
6. Layered Node is a small lump on the wall which limits secondary node shielded room or around the hole node.
Channel has a hole nodes (dots) outside the room empties out the dots and on the other hand has holes (dots) in facing the cell lumen.
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