CAM pathway photosynthesis
153.3 هزار بار بازدید -
7 سال پیش
-
This lecture explains about the
This lecture explains about the CAM pathway of photosynthesis reaction that helps in minimizing water loss by crassulacean plants.
A second strategy to decrease photorespiration in hot regions
has been adopted by many succulent (water-storing)
plants such as cacti, pineapples, and some members of
about two dozen other plant groups. This mode of initial
carbon fixation is called crassulacean acid metabolism
(CAM), after the plant family Crassulaceae (the
stonecrops or hens-and-chicks), in which it was first discovered.
In these plants, the stomata (singular, stoma),
specialized openings in the leaves of all plants through
which CO2 enters and water vapor is lost, open during the
night and close during the day. This pattern of stomatal
opening and closing is the reverse of that in most plants.
CAM plants open stomata at night and initially fix CO2
into organic compounds using the C4 pathway. These organic
compounds accumulate throughout the night and
are decarboxylated during the day to yield high levels of
CO2. In the day, these high levels of CO2 drive the Calvin
cycle and minimize photorespiration. Like C4 plants,
CAM plants use both C4 and C3 pathways. They differ
from C4 plants in that they use the C4 pathway at night
and the C3 pathway during the day within the same cells. In
C4 plants, the two pathways take place in different cells.
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Thank you for watching the Photosynthesis lecture on CAM pathway.
A second strategy to decrease photorespiration in hot regions
has been adopted by many succulent (water-storing)
plants such as cacti, pineapples, and some members of
about two dozen other plant groups. This mode of initial
carbon fixation is called crassulacean acid metabolism
(CAM), after the plant family Crassulaceae (the
stonecrops or hens-and-chicks), in which it was first discovered.
In these plants, the stomata (singular, stoma),
specialized openings in the leaves of all plants through
which CO2 enters and water vapor is lost, open during the
night and close during the day. This pattern of stomatal
opening and closing is the reverse of that in most plants.
CAM plants open stomata at night and initially fix CO2
into organic compounds using the C4 pathway. These organic
compounds accumulate throughout the night and
are decarboxylated during the day to yield high levels of
CO2. In the day, these high levels of CO2 drive the Calvin
cycle and minimize photorespiration. Like C4 plants,
CAM plants use both C4 and C3 pathways. They differ
from C4 plants in that they use the C4 pathway at night
and the C3 pathway during the day within the same cells. In
C4 plants, the two pathways take place in different cells.
For more information, log on to-
http://www.shomusbiology.com/
Get Shomu's Biology DVD set here-
http://www.shomusbiology.com/dvd-store/
Download the study materials here-
http://shomusbiology.com/bio-material...
Remember Shomu’s Biology is created to spread the knowledge of life science and biology by sharing all this free biology lectures video and animation presented by Suman Bhattacharjee in YouTube. All these tutorials are brought to you for free. Please subscribe to our channel so that we can grow together. You can check for any of the following services from Shomu’s Biology-
Buy Shomu’s Biology lecture DVD set- www.shomusbiology.com/dvd-store
Shomu’s Biology assignment services – www.shomusbiology.com/assignment -help
Join Online coaching for CSIR NET exam – www.shomusbiology.com/net-coaching
We are social. Find us on different sites here-
Our Website – www.shomusbiology.com
Facebook page- Facebook: ShomusBiology
Twitter - Twitter: shomusbiology
SlideShare- www.slideshare.net/shomusbiology
Google plus- https://plus.google.com/1136485849827...
LinkedIn - LinkedIn: suman-bhattacharjee-2a051661
Youtube- thefunsuman
Thank you for watching the Photosynthesis lecture on CAM pathway.
7 سال پیش
در تاریخ 1396/01/01 منتشر شده
است.
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