Rehydration of Sugar Beet Plants after Water Stress: Effect of Cytokinins |
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Authors: | L. Vomáčka J. Pospíšilová |
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Affiliation: | (1) Faculty of Science, Charles University of Prague, Vininá 5, CZ-12844 Praha 2, Czech Republic;(2) Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Na Karlovce 1a, CZ-16000 Praha 6, Czech Republic |
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Abstract: | The possibility to improve the recovery of sugar beet plants after water stress by application of synthetic cytokinins N6-benzyladenine (BA) or N6-(m-hydroxybenzyl)adenosine (HBA) was tested. Relative water content (RWC), net photosynthetic rate (PN), transpiration rate (E), stomatal conductance (gs), chlorophyll (Chl) a and Chl b contents, and photosystem 2 efficiency characterized by variable to maximal fluorescence ratio (Fv/Fm) were measured in control plants, in water-stressed plants, and after rehydration (4, 8, 24, and 48 h). Water stress markedly decreased parameters of gas exchange, but they started to recover soon after irrigation. Application of BA or HBA to the substrate or sprayed on leaves only slightly stimulated recovery of PN, E, and gs in rehydrated plants, especially during the first phases of recovery. Chl contents decreased only under severe water stress and Fv/Fm ratio was not significantly affected by water stress applied. Positive effects of BA or HBA application on Chl content and Fv/Fm ratio were mostly not observed. |
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Keywords: | benzyladenine Beta vulgaris chlorophyll photochemical efficiency of photosystem 2 hydroxybenzyl-adenosine net photosynthetic rate stomatal conductance transpiration rate water use efficiency |
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