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560K subscribers. Subscribed. 1K views 4 years ago Botany. This Lecture talks about Photorespiration - A Necessary Evil. ...more.
Photorespiration is definitely not a win from a carbon fixation standpoint. However, it may have other benefits for plants. There's some evidence that photorespiration can have photoprotective effects (preventing light-induced damage to the molecules involved in photosynthesis), help maintain redox balance in cells, and support plant immune ...
Transpiration is called necessary evil because: It causes around 90% of water loss for the plant. But it is necessary for the plant since it causes a suction force known as transpirational pull. This suction force helps in transporting water up to larger heights in plants against the force of gravity.
Photorespiration is a necessary evil of plant metabolism. Photorespiration allows leaves to utilise excess light energy and reduce photo-oxidative damage when the stomata are closed. However, many plants do not undergo photorespiration.
Photorespiration (also known as the oxidative photosynthetic carbon cycle or C 2 cycle) refers to a process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, wasting some of the energy produced by photosynthesis.
What is photorespiration? How does it differ from dark respiration? What is the cost of photorespiration to the plant? Why does it happen? What conditions lead to higher rates of photorespiration? How does the C4 pathway solve problems of photorespiration? What is the role of the Calvin cycle in C4 photosynthesis?
Feb 1, 2023 · Photorespiration, also known as oxidative photosynthetic carbon cycle or C2 photosynthesis, is a process found in normal C3 plant respiration. Here, the enzyme RuBisCO uses O 2 as a substrate instead of CO 2. This alternative pathway leads to the loss of fixed carbon, wastes energy, and decreases sugar synthesis.
