Seasonal changes in sugar beet photosynthesis as affected by exogenous cytokinin N6-(m-hydroxybenzyl)adenosine
1996
Catsky, J. | Pospisilova, J. | Gaudinova, A. (Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky) | Kaminek, M. | Pulkrabek, J. | Zahradnicek, J.
Foliar sprays with N6-(m- hydroxybenzyl)adenosine, (mOH)-[9R]BAP, one of the synthetic cytokinins, were applied to field-grown sugar beet twice during the vegetation period: before full canopy closing (I), 6 weeks before harvest (II) or both. The total content of isoprenoid cytokinins at harvest was 2.6-fold higher in (mOH)[9R]BAP-treated plants as compared to the controls. Increased values in photosynthesis, photorespiration and Chl a and b contents were found in variants II and I+II linked with a delay in leaf senescence before harvest. Transpiration rate and stomatal conductances of adaxial and abaxial epidermes were not significantly affected by any treatment.
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