Plant Tissues

1
Plant Tissues
2
Tissues

• Dermalskin
• Vascularconducting
• Groundpithundifferentiated tissue

3
Cell Types

• Parenchyma
• No secondary cell wall
• Often used for storage
• Thin and flexible tissues
• Leaves

4
(No Transcript)
5
Cell types (continued)

• Collenchyma
• Thickened cell walls but without lignin
• Flexible support
• Lots of pectin
• Celery strings

6
Cell types (continued)

• Sclerenchyma
• Thickened heavy walls with lots of lignin
• Strong less flexible
• Wood
• Fibers
• Sclereids

7
Sclerenchyma

• Sclereids in pears
• Fibers in wood

8
(No Transcript)
9
Meristems

• Involved in growth
• Growth occurs at four areas
• Apical buds/meristems
• Axillary buds and lateral buds
• Vascular cambium
• Cork cambium

10
Secondary vs. primary growth

• Primary growth includes any growth where the
  cells have no thickened cell walls (without
  lignin)

11
Secondary vs. primary (cont.)

• secondary growth is produced by lateral meristems
  and can produce sclerenchyma cells
• Secondary growth includes cells with lignin and
  is produced by
• Vascular cambium
• Cork cambium

12

• Why sex?

13

• Why Sex?

14

• WHY
• SEX?

15

• WHY
• SEX?!!

16
Ways to reproduce

• Sexually
• Asexually

17
ASEXUAL MEANS

• Asexual reproduction is essentially cloning
  (unless mutation occurs)
• Stolons
• Runners
• Cuttings
• Tillering, etc.

Strawberries
18
Sexual reproduction

• Usually by flowers

19
Life cycle

• Alternation of generations
• Gametophyte (1n)
• Sporophyte (2n)
• Example here fern
• Much more on this in later chapters