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Plant and Cell Physiology, 1973, Vol. 14, No. 6 1099-1106
© 1973

Article

The effects of 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone on isolated pea chloroplasts

U. Than Nyunt1 and J. T. Wiskich

Botany Department, University of Adelaide Adelaide, S. Anstralia 5001

The effects of a quinone analogue, 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB), on the photochemical activities of isolated pea chloroplasts have been investigated. DBMIB completely inhibits pseudo-cyclic flow with methyl viologen (MV) and partially inhibits non-cyclic flow with ferricyanide (FeCN) in both coupled and uncoupled systems. It is also shown that, under some circumstances, DBMIB acts like an uncoupler in that it stimulates electron flow and inhibits cyclic photophosphorylation.

1 Present address: 32(1), 6 1/4 Mile, Prome Road, Kamayut P. O., Rangoon, Burma.

(Received May 21, 1973; )
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