Special issue in honour of Prof. Reto J. Strasser - Photosynthetic activity as assessed via chlorophyll a fluorescence suggests a role of potassium channels in root to shoot signaling
| Autor: | O.V. VOITSEKHOVSKAJA, V.I. APOLLONOV, A.V. MURTUZOVA, C.K. RABADANOVA, M.A. CHARNYSH, I.V. DROZDOVA, A.I. BELYAEVA, O.N. KOVALEVA, I.G. LOSKUTOV, K. PAWLOWSKI, V.V. DEMIDCHIK, E.V. TYUTEREVA |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Photosynthetica, Vol 58, Iss 2, Pp 608-621 (2020) |
| Druh dokumentu: | article |
| ISSN: | 0300-3604 1573-9058 |
| DOI: | 10.32615/ps.2020.025 |
| Popis: | Potassium is indispensable for plant growth. Recently, a role of K+ channels has emerged in sensing and transducing stress and nutrient status. Tetraethylammonium (TEA+) is a specific blocker of K+ transport and affects K+ channel gene expression. Two barley varieties with contrasting salinity tolerance, and a chlorophyll b-less mutant, were grown either in the presence of TEA+ alone or combined with NaCl, at two different concentrations of external K+ and Ca2+, and were analyzed nine days after germination. Chlorophyll a transients monitored via JIP-tests were used to evaluate the state of the photosynthetic machinery. In contrast to reported responses to K+ deficiency, TEA+ inhibited shoot growth while inducing root growth and increasing photosynthetic performance. Both TEA+ and NaCl induced the appearance of negative K-bands in OJIP kinetics and an increase in PIABS, indicating a stimulation of photosynthesis by increased sink strength in the context of root to shoot signaling. |
| Databáze: | Directory of Open Access Journals |
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