Photosynthetica 2021, 59(1):127-136 | DOI: 10.32615/ps.2020.077
Potassium deficiency impact on the photosynthetic apparatus efficiency of radish
- 1 Department of Plant Physiology, Institute of Biology, Warsaw University of Life Sciences WULS-SGGW, 159 Nowoursynowska Street, 02-776 Warsaw, Poland
- 2 Department of Agronomy, Faculty of Agriculture and Biology, Warsaw University of Life Sciences WULS-SGGW, 159 Nowoursynowska Street, 02-776 Warsaw, Poland
- 3 Department of Environmental Development, Institute of Environmental Engineering, Warsaw University of Life Sciences WULS-SGGW, 159 Nowoursynowska Street, 02-776 Warsaw, Poland
- 4 Department of Vegetable and Medicinal Plants, Institute of Horticulture Sciences, Warsaw University of Life Sciences WULS-SGGW, 166 Nowoursynowska Street, 02-787 Warsaw, Poland
Potassium is an essential nutrient for plants and its limited resources impose the improvement of the fertilizer-use efficiency. To address this issue, it is important to understand its roles in the photosynthesis and to provide a quick, noninvasive method for diagnosing its deficiency in plants. The impact of potassium deficiency on the photochemical phase of photosynthesis has not been well understood. In this work, we present the K+-deficiency effect on gas exchange, chlorophyll content, and electron transport chain in two hybrid cultivars of radish. Our results showed that one of the cultivars proved to be tolerant and maintained the net photosynthetic rate at the level of the control plants. In both cultivars, the effect on the photochemical phase of photosynthesis was observed. We suspect that low K+ availability impaired the balance of the H+ influx to thylakoid lumen which increased its acidification and triggered the downregulation mechanism leading to the rearrangement of PSII complexes and an increase in energy dissipation.
Additional key words: chlorophyll a fluorescence; JIP-test; stomatal conductance; transpiration rate.
Received: July 16, 2020; Revised: October 20, 2020; Accepted: November 2, 2020; Prepublished online: February 15, 2021; Published: March 18, 2021 Show citation
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