EFFECTS OF BICARBONATE ION ON CHLOROPHYLL <i>a</i> FLUORESCENCE TRANSIENTS AND DELAYED LIGHT EMISSION FROM MAIZE CHLOROPLASTS
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説明
<jats:p><jats:bold>Abstract—</jats:bold> Using high‐intensity actinic light, the chlorophyll <jats:italic>a</jats:italic> fluorescence transient from HCO<jats:sup>‐</jats:sup><jats:sub>3</jats:sub>‐depleted chloroplasts shows a rapid initial rise (O → I) followed by a slow phase (I → P). In the presence of HCO<jats:sup>‐</jats:sup><jats:sub>3</jats:sub>, the O → I rise is delayed but the I → P phase is much more rapid. Using low‐intensity actinic light, the chlorophyll <jats:italic>a</jats:italic> fluorescence transient from 3‐(3,4‐dichlorophenyl)‐1,1 dimethylurea (DCMU)‐treated chloroplasts is delayed in the presence of HCO<jats:sup>‐</jats:sup><jats:sub>3</jats:sub>. Bicarbonate increases the amount of delayed light emission from chloroplasts given 10 s illumination with weak blue light (0·4 W/m<jats:sup>2</jats:sup>). DCMU greatly increases the amount of delayed light seen in the presence of HCO<jats:sup>‐</jats:sup><jats:sub>3</jats:sub> under these conditions but decreases the amount seen in the absence of HCO<jats:sup>‐</jats:sup><jats:sub>3</jats:sub>. It is suggested that HCO<jats:sup>‐</jats:sup><jats:sub>3</jats:sub> may somehow form or stabilize, in the dark, a number of reaction centers corresponding to the S<jats:sub>1</jats:sub> state in the model of B. Forbush, B. Kok and M. McGloin (<jats:italic>Photochem. Photobiol.</jats:italic> 14, 307–321, 1971).</jats:p>
収録刊行物
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- Photochemistry and Photobiology
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Photochemistry and Photobiology 19 (3), 227-232, 1974-03
Wiley