CHEM 2370 Lecture 31: Lecture 31

• School: University of Manitoba
• Department: Chemistry
• Course: CHEM 2370
• Professor: N A

Document Summary

Secondary growth is a continuous increase in the girth (diameter). It is the result of the activity of two meristems. The two meristems are the vascular cambium and the cork cambium. Note: the primary xylem was created either by the sam or ram. The function of the secondary xylem is water and mineral transport and once this role of water conduction is over, the key role is support (there is lignin and cellulose in the cell walls in the xylem). Lignin is a very tough polymer that gives support to the cells; it is very supportive to plants and is what allows trees to get to their tremendous height. The vascular cambium produces two things, the secondary xylem and the secondary phloem (inner bark) and this produced to the outside of the vascular cambium and its key role is sugar transport. There is a lot less phloem produces normally than there is xylem.