Photochemical activities of two photosystems in Bratonia orchid protocorms cryopreserved by vitrification method

  title={Photochemical activities of two photosystems in Bratonia orchid protocorms cryopreserved by vitrification method},
  author={Nikolai G. Bukhov and Elena V. Popova and A. S. Popov},
  journal={Russian Journal of Plant Physiology},
Functional activities of two photosystems in orchid-specific embryos (protocorms) of a tropical hybrid orchid Bratonia were investigated before and after their cryopreservation by vitrification method. The kinetics of light-induced absorbance changes at 830 nm was analyzed as indicator of P700 redox conversions; changes in the variable chlorophyll fluorescence served to indicate the oxidation-reduction changes of the primary acceptor QA. Untreated protocorms exhibited low photochemical activity… 

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