UT Arlington BIOL BIOL 3427 - Secondary growth in stems (6 pages)

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Secondary growth in stems



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Secondary growth in stems

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This outline ouitlines the effects of secondary growth on the primary body of the stem , the vascular cambium, and annuals, perennials, and biennials.


Lecture number:
7
Pages:
6
Type:
Lecture Note
School:
University of Texas at Arlington
Course:
Biol Biol 3427 - Plant Science
Edition:
1

Unformatted text preview:

BIOL 3427 1st Edition Lecture 7 Current Lecture I Secondary growth i Definition Increase in thickness or girth of the plant body ii Lateral meristems iii Vascular cambium iv Cork cambium II Annuals Biennials Perennials a Annuals i Growing season within a calendar year b Biennials i 2 growing seasons crosses over 2 calendar year c Perennials i Live for years ii Vines shrubs trees d Herbaceous i A period of dormancy die back above ground e Woody i Stop growing when unfavorable ii Deciduous 1 Drop leaves all at once iii Evergreen 1 Drop leaves but not all at once III Vascular Cambium a Initials b Fusiform initials i Vertically oriented squarish or slightly elongated c Ray initials i Horizontally oriented squarish or slightly elongated d Secondary vascular tissues e Axial system i Produced by fusiform initials ii Secondary xylem inward and phloem outward f Radial system i Produced by ray initials ii Vascular rays composed of ray cells iii Transport and storage functions g Vascular cambium These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute IV V VI VII i Initials also divide anticlinally to increase circumference Effects of Secondary growth a Periderm i Cork Cambium 1 Arises in cortex ii Cork 1 Compact produced to the exterior 2 Suberin wax laid down during differentiation 3 Impermeable to water gases iii Phelloderm 1 Produced to the interior of cork cambium 2 Similar to parenchyma Tissues present after one year a Epidermis remnants b Periderm 3 layers c Cortex d Primary phloem fibers other phloem crushed e Secondary phloem f Vascular cambium g Secondary xylem i Differentiated compared to secondary growth of roots h Primary xylem i Pith j Lenticels i Portions of periderm with numerous intercellular spaces 1 Gas exchange Effects of secondary growth a Bark i All tissues outside vascular cambium ii Additional cork cambia form 1 Arise from parenchyma cells in phloem 2 Each



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