1photosynthesis植物光合作用课件.pptVIP

植物生理学 ;Biochemistry Molecular Biology of Plants ? Bob B. Buchanan Wilhelm Gruissem Russell L. Jones; Part 1 Photosynthesis ;?;Reaction1.2: Oxygenic Phototsynthesis CO2+2H2O→(CH2O)+O2+H20 ; Reaction1.3:Photosynthetic sulfur reduction;1.1.2 In photosynthetic eukaryotes, photosynthesis takes place in the chloroplast, a specialized organelle ;Chloroplast, a double-membrane system, consist of an out envelope and inner envelope. The internal membrane system , known as the thylakoids, contains granal thylakoids and stroma thylakoids. The thylakoid membranes are all interconnected and enclose an internal space, the lumen. ;1.1.3 Photosynthesis requires the coordination of two phases: light reactions and carbon-linked reactions ;Light reactions: produce O2, ATP, and NADPH. Carbon reduction cycle: reduce CO2 to carbohydrate on consuming the ATP and NADPH. The conception that water oxidation and CO2 reduction were not obligately linked was first advanced in 1930s by Robert Hill . Reaction 1.4: Hill Reaction 2H2O+2A→O2+2H2A ;1.2 Light Absorption and energy conversion.? 1.2.1 Light is absorbed by pigment molecules.? Pigment→Pigment*;丈中挽寨虑滇硅形杂荡恤檬斑腹迈厕扬瑞撩户挨粟降臻墩硅睹亥找莽揉俗1photosynthesis植物光合作用课件1photosynthesis植物光合作用课件; number of products formed photochemically Equation 1.2.1: Quantum Yield Ф= ------------------------------------------------------- Number of quanta absorbed ;1.2.2????????? Almost all photosynthetic organisms contain chlorophyll or a related pigment.;Plants, Algae and Cyanobacteria: chlorophyll a or chlorophyll b. Anaerobic photosynthetic bacteria: bacteriochlorophyll a. Chlorophylls have a porphyrin ring structure that contains a central Mg atom coordinated to the four modified pyrrole rings. Chlorophyll molecules also contain a long hydrocarbon tail that