FRST 200 Lecture Notes - Lecture 20: Epicormic Shoot, Adventitiousness, Flowering Plant
Document Summary
Frst 200 crown form: short shoots vs long shoots. Some species produce 2 distinct types of shoots: Short usually lower laterals (determinate, don"t keep making new leaves) Long usually terminals or upper laterals (indeterminate) Sometimes terminal buds do this too (can switch back and forth) Short shoots may, after several years, go long; can also happen if the terminal removed: epicormic shoots: From lateral buds that stay dormant for many years until they"re released -> cause knots and reduce wood quality. Aspen doesn"t have dormant buds, but black cottonwood does. Dormant (suppressed) buds do grow a bit each year to keep pace with stem diameter. Released in response to light or warmth: e. g. Frequency varies with species (more in angiosperms: adventitious shoots (e. g. from wounds or roots, branching patterns: main shoot is the first order shoot. Normally does not go beyond 3 or 4 orders or so. Many conifers produce 1 ring of branches around the stem each year.
