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Experimental Test of Light Curve Models in Estimating Photosynthetic Activity by the Example of Ornamental Plants

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Abstract

The features of CO2 exchange in leaves of ornamental plants widely used for planting on the Southern coast of Crimea and the Black Sea coast of the Caucasus—Nerium oleander L., Laurus nobilis L., Aucuba japonica variegata Thunb., and Melissa officinalis L.—have been studied. The use of a modified rectangular hyperbole model, able to describe photoinhibition of a process by nonrectangular hyperbole, and a modified nonrectangular hyperbole model has shown the high adequacy of these models for describing the real relation between photosynthesis rate and light intensity in N. oleander, L. nobilis, A. japonica variegata, and M. officinalis. Estimation of CO2 exchange in leaves in similar environmental conditions has shown significant differences in PN/I curve parameters—light compensation point (LCP), photosynthetic and dark respiration rate, light saturation, and quantum yield. N. oleander has shown the highest photosynthetic intensity, while A. japonica variegata showed the lowest—its light saturation was recorded at low values of photosynthetically active radiation (PAR). Smaller values of LCP and saturation constants observed in L. nobilis and A. japonica variegata provide evidence of the efficient use of low-intensive PAR by these plants allowing them to survive in strong shading conditions.

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ACKNOWLEDGMENTS

This study was supported by the Russian Science Foundation, project no. 14-50-00079.

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Authors and Affiliations

  1. Nikita Botanical Gardens, National Scientific Center, 298648, Yalta, Republic of Crimea, Russia

    S. P. Korsakova, Yu. V. Plugatar & O. A. Ilnitsky

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  1. S. P. Korsakova
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  2. Yu. V. Plugatar
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  3. O. A. Ilnitsky
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Correspondence to S. P. Korsakova.

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The authors declare that they have no conflict of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Translated by E. Bataeva

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Korsakova, S.P., Plugatar, Y.V. & Ilnitsky, O.A. Experimental Test of Light Curve Models in Estimating Photosynthetic Activity by the Example of Ornamental Plants. Russ. Agricult. Sci. 45, 48–56 (2019). https://doi.org/10.3103/S1068367419010087

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  • DOI: https://doi.org/10.3103/S1068367419010087

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