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Enhanced plant tolerance after ABA application
 Pospíšilová, Jana ; Synková, Helena ; Baťková, Petra ; Haisel, Daniel ; Pešek, Bedřich
Critical period during micropropagation is often ex vitro transfer. The aim of this research was to determine whether exogenous abscisic acid (ABA) applied immediately after ex vitro transfer of in vitro grown tobacco regenerants can not only decrease transpiration rate and so partially eliminate their wilting but also ameliorate photoinhibition and oxidative stress. After ABA application, ABA content in tobacco leaves increased considerably, stomatal conductance and transpiration rate decreased more than in control plants and their wilting was limited. Chlorophyll and -carotene contents were higher in these plants, but the content of xanthophyll cycle pigments was not increased. However, the degree of xanthophyll cycle pigments deepoxidation was decreased what also suggested less stress in these plants. Applied ABA stimulated activities of some antioxidative enzymes but not immediately after ex vitro transfer.
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