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2018, № 73

UDC: 582.788.1:581.5
GSNTI: 68.35.57:34.35.15

Optimum and limiting conditions of environmental factors and their effect on the intensity of visible photosynthesis of Prunus laurocerasus L. under conditions of the South Coast

The dependence of the net photosynthesis intensity of Prunus laurocerasus L. by environmental factors, leaf temperature, transpiration, and their change in the course of the growing period are investigated. Functions of photosynthetic response on environmental factors in the three-dimensional coordinate system is in the form of a convex surface with a peak at the top made it possible obtain numerical coefficients nonlinear regression equations relationships (models) the value of net photosynthesis for Prunus laurocerasus L. from major environmental factors, and temperature and leaf transpiration. The data make it possible to interpret the photosynthesis rate as potential ecologo-physiological characteristic of the species, which in turn, allows you to compare different types of plants growing under similar conditions, in terms of measured using the same technique Prunus laurocerasus L. has a high photosynthetic capacity for acclimatization to the high temperature. When air temperature increases above of optimum value the rate photosynthesis drops sharply. Analysis of the results of our research showed that for Prunus laurocerasus L. threshold temperature is 35оС. The optimum value of rate photosynthesis during August-October decrease by 51,73%, transpiration intensity by 78%, air temperature by 17%, humidity deficit - 17,86%, leaf temperature - 53,4% and light PAR by 33,34%.
Keywords: Prunus laurocerasus, rate of net photosynthesis, light-temperature optima, ecologo-physiological characteristic
DOI: 10.21515/1999-1703-73-68-72

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Authors:

1. Ilnitsky Oleg Antonovich, DSc in Biology, Head of the Laboratory phytomonitoring, Federal State Institution of Science "Order of the Labour Red Banner Nikita Botanical Gardens - National Scientific Center Russian Academy of Science".
2. Korsakova Svetlana Pavlovna, Phd in Biology, Senior Research Scientist of the Laboratory phytomonitoring, Federal State Institution of Science "Order of the Labour Red Banner Nikita Botanical Gardens - National Scientific Center Russian Academy of Science".
3. Plugatar' Yuri Vladimirovich, DSc in Agriculture, Corresponding Member of RAS, Head of the Department Dendrology, Floriculture and Landscape Architecture, Federal State Institution of Science "Order of the Labour Red Banner Nikita Botanical Gardens - National Scientific Center Russian Academy of Science".
4. Pashtetsky Andrey Vladimirovich, Phd in Economics, Deputy Director of Scientific and Organizational activities, Federal State Institution of Science "Order of the Labour Red Banner Nikita Botanical Gardens - National Scientific Center Russian Academy of Science".