Plant Transport Investigation
This study explores the impact of radioactive potassium-42 (42K+) on transpiration and translocation in seedlings. We utilized wood and bark pieces to measure radioactive counts after applying 42K+ to root systems. Our findings highlight how blocking stomata with radioactive phosphate inhibits gas exchange and affects photosynthesis, demonstrating the critical role of stomata in regulating water loss and nutrient intake. By examining the physiological responses of guard cells under different water conditions, we gain insights into plant transport dynamics under stress conditions.
Plant Transport Investigation
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Presentation Transcript
Plant Transport Investigation petehamiltonsandringham college
Transpiration Translocation
Radioactive counts using wood and bark pieces after application of radioactive 42K+to seedling roots 40 40 40 35 55 45 Disrupts Phloem 60 70 75 100 100 source source
The Effect of Blocking Stomata Radioactive phosphate + water in veins Photosynthesis resulting in radioactive carbohydratesb No radioactive phosphate under the BS as water vapour cannot escape thro the stomata Blocked stomata prevent intake of radioaactive CO2 No radioactive CO2 in veins or under BS Transpiration
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
