Some Aspects of the Relationship between Chlorophyll a Fluorescence and Photosynthetic Carbon Assimilation

摘要: When a photon strikes chlorophyll molecule it becomes excited, an electron is raised from ground state in the molecular orbital to excited state. Blue photons, carrying higher energy, raise electrons singlet 2, red photons 1. These of course are which preferentially absorbed. Green mostly not absorbed and green light reflected (from transmitted through) leaves gives them their colour. Excited 2 decays very rapidly 1 as cascade down energy gradient, losing by radiationless de-excitation. None this available for photosynthesis. It red, more long-lived, created directly (or indirectly blue photon) starting point photosynthesis and, therefore, most biological transduction. here that transported through two photosystems reduce NADP finally CO2. In addition creation accompanied generation massive oxidising potential, positively charged “holes” within PSII, refilled drawn water. Otto Warburg believed photosynthetic transduction be perfect. not. Oxidation inevitably associated with reduction. Electrons have been will fall back into if there no acceptor available. Much dissipated these circumstances heat. A fraction, released drop or less state, brings about emission photons.