Abstract
The coordinated interaction between light-harvesting, energy conversion, electron transport, proton translocation and carbon assimilation is exquistitely matched in photosynthesis. Nowhere is this more clearly evident than in the sun/shade acclimation of the composition, function and structure of the photosynthetic apparatus1–3. Plants have sophisticated, multiple molecular mechanisms for sensing and responding to enormous fluctuations in light environment. This light acclimation has evolved because (1) plants are immobile and unable to escape from potentially damaging levels of high light, and (2) light is the driving force for photosynthesis and a trigger for photomorphogenesis. Many regulatory processes, both short-term and long-term, contribute to photosynthetic control whereby the production and consumption of ATP and NADPH closely match carbon assimilation4. On the one hand, there are many dynamic short-term changes, such as state transitions, which correct a temporary imbalance in the distribution of excitation energy between the photosystems, and ensure maximum quantum effeciency under limiting light, while at high irradiance photosynthetic control serves to dissipate excess excitation energy when the potential rate of ATP and NADPH formation exceeds the rate at which they are required for carbon assimilation. On the other hand, there are long-term changes in the relative amounts of the thylakoid complexes and mobile electron transport carriers, associated with acclimation to sun or shade1–3.
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Anderson, J.M., Chow, W.S. (1992). A Regulatory Feedback Mechanism for Light Acclimation of the Photosynthetic Apparatus: Are Photosystems II and I Self-Regulatory Light Sensors?. In: Argyroudi-Akoyunoglou, J.H. (eds) Regulation of Chloroplast Biogenesis. Nato ASI Series, vol 226. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3366-5_69
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DOI: https://doi.org/10.1007/978-1-4615-3366-5_69
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