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Advances in Photosynthesis Fundamental Aspects Part 5

Tham khảo tài liệu 'advances in photosynthesis fundamental aspects part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 112 Advances in Photosynthesis - Fundamental Aspects metabolic conditions affect the redox status of Qa and Qb directly or indirectly. It has been reported that ATP and NADPH can reduce quinones Joliot Joliot 1980 . Degradation of starch to PGA begins immediately after switching off the light. ATP and NADPH thus formed may enhance the reduction of quinones and induce the formation of charge pairs with higher S states as long as they exist Mellvig Tillberg 1986 . ATP concentration oscillates after switching cells from light to darkness which is a consequence of feedback mechanisms in the reactions of photosynthesis. A strong coupling of biochemical reactions in thylakoid membrane is also an essential prerequisite for hyperbolic decay. Fig. 3. Delayed fluorescence decay kinetics after illumination with two different wavelengths. a Prorocentrum minimum b Dunaliella tertiolecta. a.u. - arbitrary units. The transient peak is preferentially stimulated by far-red excitation Desai et al. 1983 Hideg et al. 1991 but in some species it can also be induced by shorter wavelengths Photosynthesis in Microalgae as Measured with Delayed Fluorescence Technique 113 Berden-Zrimec et al. 2008a Zrimec et al. 2005 Figure 3 . In our experiments Dunaliella tertiolecta Butcher Chlorophyta exhibited a peak at the illuminations below 600 nm and above 650 nm Zrimec et al. 2005 Figure 3b whereas Desmodesmus Scenedesmus subspicatus Chodat 1926 Chlorophyta did not exhibit the peak at all Berden-Zrimec et al. 2007 . Prorocentrum minimum Pavillard Schiller Dinophyta exhibited a peak only when illuminated with wavelengths above 650 nm Figure 3a . Bertsch 1962 observed the peak in Chlorella sp. Chlorophyta at the illumination wavelength of 700 nm but not at 650 nm. The presence of a peak in DF decay curves after a pulse of light of longer wavelengths indicates PSI involvement in DF generation Bertsch 1962 Desai et al. 1983 Hideg et al. 1991 Mellvig Tillberg 1986 because far-red light is predominantly