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Plant and Cell Physiology, 1992, Vol. 33, No. 6 799-803
© 1992

Short Communication

Photoacoustic Measurements of Cyclic Electron Flow around Photosystem I in Leaves Adapted to Light-States 1 and 2

Michel Havaux

Département de Physiologie Végétale et Ecosystèmes, Centre d'Etudes de Cadarache F-13108 Saint-Paul-lez-Durance, France

The photoacoustic technique was used to study in vivo cyclic electron flow through PS I in intact plant leaves irradiated with far-red light. Appreciable PS I-cyclic ATP formation was shown to occur in both C-3 and C-4 plants. It was also observed that various environmental/experimental conditions leading to a significant inhibition of the linear photosynthetic electron transport were associated with a stimulation of PS I-cyclic energy storage. In contrast, in vivo adaptation of leaves to light-states 1 and 2 did not induce any photoacoustically measurable changes in the capacity of PS I for cyclic electron transfer. Consequently, the presented data do not support the recent hypothesis that the main function of light-induced state transitions is to regulate the balance between linear (PS I+PS II) and cyclic (PS I) electron transport in the chloroplasts.

(Received February 24, 1992; Accepted May 15, 1992)
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