Folia Horticulturae

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Topography of photosynthesis in sweet pepper plants in comparison with their potential possibilities

Jerzy Mydlarz*, Włodzimierz Starzecki*, Stanisław Cebula**

**Institute of Plant Physiology
**Polish Academy of Sciences
**Sławkowska 17, 31-016 Kraków, Poland
**Institute of Vegetables and Ornamental Plants
**Faculty of Horticulture, Agricultural University
**29 Listopada 54, 31-425 Kraków, Poland

The investigation concerned the realization of potential possibilities of the photosynthetic process by leaves located at different levels of sweet pepper plants, cv. Mayata F1, grown in greenhouse conditions. The potential possibilities of the photosynthetic apparatus in the leaves was examined in conditions ensuring light saturation of the photosynthetic process at a normal CO2 concentration in the air. It was found that the actual values of photosynthesis of individual leaves were realized to between 40 and 80% of their possibilities. The leaves located in the upper zone of the stand showed a better utilization of this potential photosynthetic rate. The occurrence of slight differences in the compared values was also observed in apical unshaded leaves. The magnitude of these differences depended upon the degree of devation of leaf blades from the perpendicular angle of incidence of sun rays. As compared with the above data the measurements carried out on an older stand (of 6 months) showed a much poorer potential photosynthetic rate in all the leaves on the plants. The effect of increased self-shading of leaves on the inactivation of the photosynthetic process is discussed in the work.

Mydlarz J., Starzecki W., Cebula S., 1991. Topography of photosynthesis in sweet pepper plants in comparison with their potential possibilities. Folia Horticulturae III/3: 97-106.