Photosynthetica 2018, 56(3):971-975 | DOI: 10.1007/s11099-017-0728-x

Impact of intraspecific competition on photosynthetic apparatus efficiency in potato (Solanum tuberosum) plants

J. Olechowicz1, C. Chomontowski1, P. Olechowicz2, S. Pietkiewicz1, A. Jajoo3,*, M. H. Kalaji1,4,*
1 Department of Plant Physiology, Warsaw University of Life Sciences SGGW, Warsaw, Poland
2 Cardinal Stefan Wyszyński University in Warsaw, Warsaw, Poland
3 School of Life Science, Devi Ahilya University, Indore, India
4 SI Technology, Warsaw, Poland

Unfavourable growth conditions significantly determine the yield of crop plants. Intraspecific competition is a condition in which plants compete with each other for environmental resources. An excessive density contributes to increased competition within species, which results in disruption of photosynthesis process. According to this idea, experiments were conducted to investigate the photosynthetic response of potato (Solanum tuberosum) plants to excessive congestion. Two potato varieties of different earliness classes (Vineta and Satina) were used to evaluate the efficiency of the photosynthetic apparatus based on chlorophyll (Chl) fluorescence measurements under stress conditions. Changes in Chl contents of the tested plants were also analysed. In relation to intraspecific competition, we can conclude that the Vineta variety was less sensitive to this stress factor. In contrast, the photosynthetic apparatus of the Satina variety showed less efficient functioning under these conditions. In this study, the application of Chl fluorescence was presented for the first time in order to analyse the effects of intraspecific competition in plants.

Keywords: chlorophyll fluorescence transient; intraspecific competition; performance index; photosystem II efficiency

Received: November 9, 2016; Accepted: February 20, 2017; Prepublished online: September 1, 2018; Published: August 1, 2018Show citation

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Olechowicz, J., Chomontowski, C., Olechowicz, P., Pietkiewicz, S., Jajoo, A., & Kalaji, M.H. (2018). Impact of intraspecific competition on photosynthetic apparatus efficiency in potato (Solanum tuberosum) plants. Photosynthetica, 56(3), 971-975. doi: 10.1007/s11099-017-0728-x.
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