Several of the physiological processes in plants are directly affected by the radiant energy; and photosynthesis is one of them. In addition radiant energy is known to affect protoplasmic streaming, flower induction, chlorophyll synthesis, seed germination and even phototropism. The study of the reactions as affected by light is called photobiology. The sun is the source of energy where reactions [...]
The following points highlight the seven main types of photoreceptors of photosynthetic pigments. The photoreceptors are: 1. Phycobilins 2. Cryptochrome 3. UV-B Receptors 4. Flavonoids 5. Betacyanins 6. Chloroplasts 7. Carotenoid Pigments. Photoreceptor # 1. Phycobilins: These are present in red algae, cyanobacteria or even green plants and serve as accessory light- harvesting pigments. Four phycobilins are reported; three are [...]
In this article we will discuss about the primary and secondary reactions of photosynthesis. Ruben and his co-workers in early 1943 used 18O and proved that oxygen evolved in photosynthesis came from water. Photosynthesis allowed to proceed in H2O18 and normal CO2, had molecular oxygen evolved with heavy isotopes. When photosynthesis was carried out in the presence of normal H2O [...]