Abstract
Some photoreactions of photosynthetic materials (corn chloroplasts, spinach chloroplasts and subchloroplast particles rich in System II) are examined at 77°K. The fluorescence yield of chlorophyll is observed to decrease reversibly upon irradiation at 77°K. The presence of ferricyanide in the chloroplast preparations increases the rate of decline of fluorescence yield while the presence of benzylviologen and phenazine methosulfate inhibits the decline of fluorescence yield. Extracts of Ricinus communis leaf (castor bean) also inhibits the decline of fluorescence yield. Data is given showing the effect of linolenic acid, extracts of Ricinus leaf, ferricyanide, benzylviologen and phenazine methosulfate on the ratio of fluorescence intensities at 725 and 700 nm.
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