biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 46:57-62, 2003 | DOI: 10.1023/A:1022306032416

Rehydration of Sugar Beet Plants after Water Stress: Effect of Cytokinins

L. Vomáčka1, J. Pospíšilová2
1 Faculty of Science, Charles University of Prague, Praha 2, Czech Republic
2 Institute of Experimental Botany, Academy of Sciences of the Czech Republic, Praha 6, Czech Republic

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.

Keywords: benzyladenine; Beta vulgaris; chlorophyll; photochemical efficiency of photosystem 2; hydroxybenzyl-adenosine; net photosynthetic rate; stomatal conductance; transpiration rate; water use efficiency
Subjects: benzyladenine, rehydration after water stress; Beta vulgaris; cytokinins; fluorescence, chlorophyll, photochemical activities; gas exchange, rehydration after water stress, cytokinins; N6-(m-hydroxybenzyl)adenosine, rehydration after water stress; photochemical efficiency of photosystem 2, rehydration after water stress, cytokinins; photosystem 2, rehydration after water stress, cytokinins; rehydration after water stress, cytokinins; stomatal conductance, rehydration after water stress, cytokinins; sugar beet, rehydration after water stress, cytokinins; water use efficiency, rehydration after water stress, cytokinins

Prepublished online: March 1, 2003; Published: July 1, 2003  Show citation

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Vomáčka, L., & Pospíšilová, J. (2003). Rehydration of Sugar Beet Plants after Water Stress: Effect of Cytokinins. Biologia plantarum, 46(1), 57-62. doi: 10.1023/A:1022306032416
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