Biologia Plantarum

, 38:511 | Cite as

Seasonal changes in sugar beet photosynthesis as affected by exogenous cytokininN 6-(m- hydroxybenzyl)adenosine

  • J. ČatskýEmail author
  • J. Pospíšilová
  • M. Kamínek
  • A. Gaudinová
  • J. Pulkrábek
  • J. Zahradníček
Original Paper


Foliar sprays withN 6-(m-hydroxybenzytyadenosine, (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. Application of (mOH)[9R]BAP retained high cytokinin content that usually declines prior to harvest. The total content of isoprenoid cytokinins at harvest was 2.6-fold higher in (mOH)[9R]BAP-treated plants as compared to the controls. TreatmentI had no significant effect on contents of chlorophylls (Chl)a andb and carotenoids, nor on the rates of net photosynthesis (PN) or photorespiration (Rl), or on CO2 compensation concentration (Γ) measured during the whole vegetation period on detached leaves under optimum environmental conditions. Increased values in PN, RL and Chla andb contents were found in variantsII 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.


Sugar Beet Stomatal Conductance Endogenous Cytokinin Zeatin Riboside Sugar Beet Plant 
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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • J. Čatský
    • 1
    Email author
  • J. Pospíšilová
  • M. Kamínek
    • 2
  • A. Gaudinová
  • J. Pulkrábek
    • 3
  • J. Zahradníček
    • 4
  1. 1.Institute of Experimental BotanyAcademy of Sciences of the Czech RepublicPrague 6Czech Republic
  2. 2.Institute of Experimental Botany, Academy of Sciences of the Czech RepublicDe Montfort University, Norman Borlaug Centre for Plant SciencePrague 6Czech Republic
  3. 3.Czech Agricultural UniversityPrague 6Czech Republic
  4. 4.VUC Praha, a.s.Prague 4Czech Republic

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