Effect of Light Intensity on the Photosynthetic Physiology of Neopyropia Yezoensis Strain from the Yellow Sea
The effects of light intensity on the photosynthetic physiology of Neopyropia yezoensis strain free filaments from the Yellow Sea were studied by the measurement of photosynthetic pigment and chlorophyll fluorescence.Results showed that the strain filaments exhibited a relatively high actual quantum efficiency(△F/Fm')at 30 μmol/(m2·s)light intensity,but decreased significantly when treated with 110 μmol/(m2·s)and 150 μmol/(m2·s)light intensities,and the AF/Fm also decreased with the extension of lighting time.The maximum quantum efficiency(Fv/Fm)of the samples decreased significantly with the increase of the light intensity.The Initial slope of the Rapid Light Curve(a)of samples under low light intensity was higher than those of samples under high light intensities,while the difference in semi saturated light intensity(Ik)and maximum relative electron transfer rate(rETRmax)was not significant.The photochemical quenching parameter(qP)of samples decreased with the increase of light intensities,while the non photochemical quenching parameter(NPQ)of the samples under the 150 μmol/(m2·s)light intensity was significantly higher than those samples under other light intensities.The content of photosynthetic pigments phycoerythrin,phycocyanin,and allophycocyanin all decreased with increasing light intensities,and those pigments content of sample under 150 μmol/(m2·s)were significantly lower than those of the sample under 30 μmol/(m2·s).The change in chlorophyll a content was similar to that of phycobiliprotein.This study indicates that the N.yezoensis strain free filaments from the Yellow Sea exhibits an active physiological state under low light intensity.It is a germplasm that adapts to low light intensity.The strain can adapt to changes in light intensity by reducing the content of photosynthetic pigments and coordinating the distribution of absorbed light energy.This provides experimental data for the setting of suitable environmental factors for efficient cultivation of N.yezoensis filamentous.
万方数据
维普
