Plant Transport Investigation

Plant Transport Investigation

pete hamilton sandringham college

Transpiration Translocation

  Average Growth (mm)

Days after Treatment

Control Ringed Defoliated Ringed & Defoliated

3 94 71 36 14

5 164 130 80 16

9 341 218 270 20

1 2 30

50

100

150

200

250

300

350

400

94

164

341

71

130

218

36

80

270

14 16 20

Control

Ringed

Defoliated

Ringed & Defoliated

Days after Treatment

Average Growth  mm

Plant Transport in Vascular Tissue

Radioactive counts using wood and bark pieces after application of radioactive 42K+to seedling roots

  Average number of countsInternode number

Control plant Ringed plant

Wood Bark Wood Bark

6 70 30 75 35

5 90 50 85 50

4 115 60 110 65

3 125 65 Ring Ring

2 135 65 150 75

1 180 80 200 90100

55

60

70

40

40

source source

100

75

45

35

40

Disrupts Phloem

Photosynthesis resulting in radioactive 

carbohydratesb

Transpiration

Blocked stomata prevent intake of radioaactive CO2

No radioactive CO2 in veins  or under BS

Radioactive phosphate + water in veins

No radioactive phosphate under

the BS as water vapour cannot

escape thro the stomata

The Effect of Blocking Stomata

Stomata – pores in the epidermis allow movement of gases into and out of the leaf tissue. Guard cells open and close these pores to aloow gaseous exchange without excessive water loss.

Open when Turgid Ie. water available

Closed when flaccid

Ie.less water available