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Plant and Cell Physiology, 1992, Vol. 33, No. 6 689-693
© 1992

Delayed Fluorescence and Ultraweak Light Emission from Isolated Chloroplasts (Comparison of Emission Spectra and Concentration Dependence)

Éva Hideg1,2, Masaki Kobayashi1 and Humio Inaba1,3

1 Biophoton Project, Research Development Corporation of Japan (JRDC) 2-1-1 Yagiyama-minami, Taihaku-ku, Sendai, 982 Japan
2 Institute of Plant Physiology, Biological Research Center, Hungarian Academy of Sciences H-6701 Szeged, Temesvári krt. 62, P.O. Box 521, Hungary
3 Research Institute of Electrical Communication, Tohoku University 2-2-1 Katahira, Aoba-ku, Sendai, 982 Japan

The ultraweak light emission of isolated chloroplasts (Hideg and Inaba (1991) Photochem. Photobiol. 52: 137) was investigated in comparison to delayed light emission. We compared the concentration dependence and the spectral distribution of the light emitted from isolated chloroplasts stored in the dark for 10 s, 2 min (delayed light emission), 4 and 10 h (ultraweak light emission), respectively.

In samples with low chlorophyll concentration, spectra of all emission phenomena were maximal at 685–695 nm, but spectra of ultraweak light, especially that of long term (10 h) emission, were broader in the 700–800 nm region than spectra of delayed light, indicating emission from a bigger variety of chlorophyll molecules.

The intensity of delayed light and short term (4 h) ultraweak light exhibited a simple, saturating exponential dependence on chlorophyll concentration, while long term (10 h) ultraweak light emission was best described as a saturating exponential containing a quadratic function of the concentration. This difference suggests that long term ultraweak light emission is brought about by reactions distinct from the earlier described mechanism of electron transport related dark photoemission.

(Received November 15, 1991; Accepted May 18, 1992)
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