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Characterisation of the effects of Antimycin A upon high energy state quenching of chlorophyll fluorescence (qE) in spinach and pea chloroplasts

✍ Scribed by Kevin Oxborough; Peter Horton

Publisher: Springer
Year: 1987
Tongue: English
Weight: 490 KB
Volume: 12
Category: Article
ISSN: 0166-8595
DOI: 10.1007/bf00047942

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✦ Synopsis

High energy state quenching of chlorophyll fluorescence (qE) is inhibited by low concentrations of the inhibitor antimycin A in intact and osmotically shocked chloroplasts isolated from spinach and pea plants. This inhibition is independent of any effect upon ApH (as measured by 9-aminoacridine fluorescence quenching). A dual control of qE formation, by ApH and the redox state of an unidentified chloroplast component, is implied. Results are discussed in terms of a role for qE in the dissipation of excess excitation energy within photosystem II.

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A transient in chlorophyll fluorescence, which is associated with a transient in 9-aminoacridine fluorescence and a perturbation in the rate of oxygen evolution, has been observed in intact spinach chloroplasts. The results indicate that changes in the redox state of Q are, at least partially, respo