The document discusses the effects of increasing atmospheric CO2 concentration on the environment, plant growth, and agricultural productivity. It highlights the negative impacts of CO2 on ocean acidity and marine life, while also acknowledging the potential benefits for plants, such as enhanced photosynthesis and increased water-use efficiency. Additionally, it notes the influence of CO2 on nitrogen content, rooting patterns, and crop duration, emphasizing the complexities of its effects on various species.

2. EFFECTS OF CHANGING ATMOSPHERIC
CO2 CONCENTRATION
Prepared By ASAD
Student of 6th semester
BS Botany

3. What is Carbon Dioxide
• Is a colorless, odorless gas vital to life on
earth.
• Composed of a carbon atom covalently
double bonded to two oxygen atoms.
• Comprising 0.039% of the atmosphere.

4. EFFECTS ON ENVIRONMENT

5. How does CO2 affect the Ocean?
• Our oceans absorb almost half of
all CO2 emissions and the
abnormal man-made emissions
are causing high levels of acidity
making it hard for marine life.
• Slowed growth of plankton,
corals, and other invertebrates

6. Green house gases
• One of green house gas.
• Increase amount of CO2 cancause:
Raises temperature of earth’s surface.
Reduces temperature of the stratosphere.

7. EFFECT OF INCREASED CO2 ON PLANTS

8. Effect of increased co2 on crops
• Carbon dioxide is essential to plant growth. Rising CO2 concentration in the atmosphere can
have both positive and negative consequences.
• Increased co2 is expected to have positive physiological effects by increasing the rate of
photosynthesis.
• Plant physiological and biochemical responses to increased CO2, effect have been studied
in plants with different photosynthetic pathways, mostly in C3 species, but also in C4.
• Increase CO2 concentration directly effects the growth, physiology, and chemistry of
plants.

9. PHYSIOLOGICAL EFFECTS OF PLANT DUE TO
INCREASED CO2 CONCENTRATION

10. Effect of stomata
• Increased concentrations of CO2 – partial stomatal closure.
• Reductions stomatal conductance in crops would translate into
reductions of <10% in evapotranspiration, partly because of
increases in temperature and decreases in humidity in the air
around crop leaves.

11. Effects on the leaf
• Growing plants at increased
concentration leads to increased leaf
area, leaf area index , leaf area
duration and leaf thickness.
• Increased CO2 causes plants to produce
more number of mesophyll cells and
chloroplasts

12. Effects on photosynthesis & photorespiration
• Photosynthetic capacity per unit leaf area is
increased under CO2 enrichment.
• The increased CO2 concentration effect begins
with enhanced photosynthetic CO2 fixation.
• Non-structural carbohydrates tend to accumulate
in leaves and other plant organs as starch,
soluble carbohydrates.

13. Water-use efficiency: effects of CO2
• Stomatal conductance decreases with
increasing CO2 concentration which can cause
a reduction of both leaf and whole canopy
transpiration.
• Water-Use Efficiency increased with increasing
CO2 conc.

14. CO2 effect on Nitrogen content
• Plants with nitrogen-fixing symbionts (e.g., peas, beans), under
favorable environmental conditions for both symbiont and plant, tend to
benefit more.
• For most plants, growth under increased CO2 can alter the internal
balance between carbon and nitrogen.
• The content of nonstructural carbohydrates generally increases under
high CO2, while the concentrations of mineral nutrients and proteins are
reduced

15. Changes in rooting pattern
• High carbon gain might increase root length, diameter and
number.
• Stimulate lateral root production in plants grown under High CO2.

16. Decrease in crop duration
• Duration of crop growth cycles are above all, related to
temperature. An increase in temperature will speed up
development.
• And temperature increase due to high CO2 conc.

17. Germination
• Increased CO2 concentration will decrease the rate of germination.

18. Reference
• https://en.wikipedia.org/wiki/Carbon_dioxide
• https://www.slideshare.net/Vijz1/increased-co2-effect-on-crop-
production-tam-201325
• https://www.slideshare.net/junostaro/co2-power-point

19. THE END

20. THANK YOU