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首页> 美国政府科技报告 >Concentrations of Intracellular Nutrients and Rates of Photosynthesis in Algae. Final Report, September 1, 1975--November 30, 1976
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Concentrations of Intracellular Nutrients and Rates of Photosynthesis in Algae. Final Report, September 1, 1975--November 30, 1976

机译：藻类细胞内营养物质浓度和光合作用速率。最终报告，1975年9月1日 - 1976年11月30日

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The photosynthetic activity at saturating irradiances of chlorophyll a (P/sub opt/) in the green alga Chlorella and two blue-green algae Anabaena and Oscillatoria depends upon the ratio (phi) of cellular phosphorus to chlorophyll a according to an equation for a hyperbola of the form, P/sub opt/ = P/sub max/ (1 - K/sub phi//phi). Maximal rates of photosynthesis at saturating irradiance and saturating cellular phosphorus (P/sub max/) and also subsistence concentrations of cellular phosphorus (K/sub phi/) for the two blue-green algae are higher than for the green alga. A mechanistic model for rates of photosynthesis was formulated. It describes inhibition at high light intensities, and it also describes adequately the families of photosynthesis-light curves that were produced by altering cellular phosphorus. The specific rate of photosynthesis (P) attains a theoretical maximum (P/sub max//sup t/) when both light (I) and nutrients are saturating, and it decreases to zero when the limiting cellular nutrient (phi) decreases to K/sub phi/ or light decreases to zero: P = ((P/sub max//sup t/ (1 - K/sub phi//phi)I)/(K sub 1 (1 - K/sub phi//phi) + K sub 2 + I + K sub 3 I exp 2 ). The analysis improves our understanding of the photosynthetic mechanisms by which solar energy is transformed to algal biomass. It demonstrates that the photosynthetic activity of chlorophyll a is intrinsically higher and also much more responsive to cellular phosphorus in some species, such as Anabaena and Oscillatoria, than it is in other species, such as Chlorella. (ERA citation 03:001447)

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