Journal of Photoscience

Korean Society of Photoscience (한국광과학회)
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Different Susceptibilities to Low Temperature Photoinhibition in the Photosynthetic Apparatus Among three Cultivars of Cucumber (Cucumis sativus L.)

  • Oh, Kwang-Hoon (Department of Molecular Biology, Pusan National University) ;
  • Lee, Woo-Sung (Department of Biological Science, Sungkyunkwan University) ;
  • Lee, Choon-Hwan (Department of Molecular Biology, Pusan National University)
  • Published : 2001.09.01
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Abstract

Susceptibility to low temperature photoinhibition in photosynthetic apparatus was compared among three cucumber cultivars, Gahachungjang (GH), Banbaekjijeo (BB) and Gaeryangsymji (GR). By chilling in the light for 6 h, a sustained decrease in the potential quantum yield (Fv/Fm) and the oxidizable P700 contents was observed, and the decrease was less in GH than in BB and GR. Although the difference was small, some $\Phi_{PSII}$ remained in GH after light-chilling for 6 h indicating that a few electrons can flow around photosystem II(PSII). As a consequence, the primary electron acceptor of PSII, $Q_{A}$, was reduced slowly and was not fully reduced after light-chilling for 6 h in GH. Although the amplitude was small, the development of NPQ was also faster in GH, indicating a higher capacity for non-photochemical energy dissipation. The relative fraction of a fast relaxing component of NPQ (qf) was higher in GH. After light-chilling for 5 h, the values of qf in BB and GR became much smaller than that in GH, indicating BB and GR suffered more significant uncoupling of ATPase and/or irreversible damages in PSII. When fluorescence induction transients were recorded after chilling, significant differences in quenching coefficients (qQ and qN) were observed among the three cultivars.

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