Laser-induced reactions of P700 and cytochrome f in a blue-green alga, Plectonema boryanum |
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Authors: | Tetsuo Hiyama and Bacon Ke |
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Institution: | Charles F. Kettering Research Laboratory, Yellow Springs, Ohio 45387, U.S.A. |
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Abstract: | Kinetics of the absorption change of P700 (blue band) and cytochrome f in whole cells of a blue-green alga, Plectonema boryanum, have been studied by Q-switched ruby-laser flash excitation (694 nm; approx. 20 nsec) to elucidate the sequential relationship of these two components in photosynthetic electron transport. “P700” was photooxidized within 2 μsec and recovered in two phases t1/2 10 μsec and 200 μsec). Under the same conditions cytochrome f was oxidized with a half time of 15 μsec. The magnitude of the fast phase of “P700” recovery, however, diminished at lower laser intensity while the cytochrome f change remained unaffected. The result suggests that cytochrome f and P700 may not be on the same electron-transport chain. |
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