High level of endogenous cytokinins in transgenic potato plantlets limits photosynthesis

Čatský J., Pospíšilová J., Macháčková I., Synková H., Wilhelmová N., Šesták Z.
BIOLOGIA PLANTARUM 35: 191-198, 1993

Keywords: transgenic plants, cytokinins, Solanum tuberosum, photochemical activities, photosystems, respiration
Abstract: Abstract Introduction of the gene for cytokinin synthesis into potato genome lead to a manifold increase in the level of cytokinins (zeatin, zeatin riboside, isopentenyladenine, isopentenyladenosine) in plantlets grown in vitro. The increasing cytokinin level was associated with increasing tendency to teratoma formation, to decreasing leaf net photosynthetic rate and to increasing dark and light respiration rates and CO 2 compensation concentration. During plantlet (or teratoma) ontogeny, net photosynthetic rate increased simultaneously with the decrease in cytokinin level. High level of endogenous cytokinins was associated also with lower photochemical activities of both photosystems in isolated chloroplasts.
DOI: 10.1007/BF02925938
IEB authors: Jana Pospíšilová