Vol. 17, issue 01, article # 7

Zavorueva E. N., Zavoruev V. V. Concentration dependences of the red to far-red fluorescence ratio of chlorophyll in higher plants . // Atmospheric and oceanic optics. 2004. V. 17. No. 01. P. 54-57.    PDF
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Abstract:

We study the dependence of F682/F734 parameter, the red to far-red fluorescence intensity ratio, on chlorophyll concentration under conditions of continuous illumination of vegetation in the process of growth and natural photoperiod. It is shown that the dependence of the F682/F734 ratio on the chlorophyll content is described by a quadratic expression for vegetation grown under continuous illumination condition, and by a power-law function for naturally grown plants. The third type of concentration dependence of the F682/F734 ratio is obtained for poplar leaves during the growth period. This dependence is more complicated, and cannot be described by a power-law or a quadratic function. It is concluded that all the dependences found thus far apply under specific conditions of growth, and that there is no universal function relating the red to far-red intensity ratio of the fluorescence to pigment abundance in higher plant leaves. The results presented here are well explained by the model, in which each photosystem emits at a specific wavelength.