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The behaviour of the 32 kDa Q B protein of the chloroplast thylakoid membrane was investigated in senescing leaves of Festuca pratensis. Bf 993, a non-yellowing Festuca mutant, is known to be unable to degrade at least some of its thylakoid proteins during senescence. A high rate of Q B protein turnover under illumination was observed in both Bf 993 and a normally yellowing cultivar...