TAILIEUCHUNG - Plant physiology - Chapter 7 Photosynthesis: The Light Reactions

LIFE ON EARTH ULTIMATELY DEPENDS ON ENERGY derived from the sun. Photosynthesis is the only process of biological importance that can harvest this energy. In addition, a large fraction of the planet’s energy resources results from photosynthetic activity in either recent or ancient times (fossil fuels). This chapter introduces the basic physical principles that underlie photosynthetic energy storage and the current understanding of the structure and function of the photosynthetic apparatus (Blankenship 2002). The term photosynthesis means literally “synthesis using light.” As we will see in this chapter, photosynthetic organisms use solar energy to synthesize carbon compounds that cannot be. | UNIT Biochemistry and Metabolism Chapter Photosynthesis The Light Reactions LIFE ON EARTH ULTIMATELY DEPENDS ON ENERGY derived from the sun. Photosynthesis is the only process of biological importance that can harvest this energy. In addition a large fraction of the planet s energy resources results from photosynthetic activity in either recent or ancient times fossil fuels . This chapter introduces the basic physical principles that underlie photosynthetic energy storage and the current understanding of the structure and function of the photosynthetic apparatus Blankenship 2002 . The term photosynthesis means literally synthesis using light. As we will see in this chapter photosynthetic organisms use solar energy to synthesize carbon compounds that cannot be formed without the input of energy. More specifically light energy drives the synthesis of carbohydrates from carbon dioxide and water with the generation of oxygen 6 CO2 6 H2O C6H12O6 6 O2 Carbon Water Carbohydrate Oxygen dioxide Energy stored in these molecules can be used later to power cellular processes in the plant and can serve as the energy source for all forms of life. This chapter deals with the role of light in photosynthesis the structure of the photosynthetic apparatus and the processes that begin with the excitation of chlorophyll by light and culminate in the synthesis of ATP and NADPH. PHOTOSYNTHESIS IN HIGHER PLANTS The most active photosynthetic tissue in higher plants is the mesophyll of leaves. Mesophyll cells have many chloroplasts which contain the specialized light-absorbing green pigments the chlorophylls. In photosynthesis the plant uses solar energy to oxidize water thereby releasing oxygen and to reduce carbon dioxide thereby forming large carbon compounds primarily sugars. The complex series of reactions that .

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