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The effect of ionic stress on photosynthesis inDunaliella tertiolecta

✍ Scribed by D. J. Gilmour; M. F. Hipkins; A. N. Webber; N. R. Baker; A. D. Boney

Publisher: Springer-Verlag
Year: 1985
Tongue: English
Weight: 649 KB
Volume: 163
Category: Article
ISSN: 0032-0935
DOI: 10.1007/bf00393515

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✦ Synopsis

A comparison of the effects of ionic stress and an uncoupler on long-term fluorescence transients (the 'Kautsky effect') in the green alga Dunaliella tertiolecta indicated that the large quenching induced by ionic stress was caused by a pH gradient across the thylakoid membrane. This possiblity was given support by the increase in the slow phase of 3-(3',4'-dichlorophenyl)-1,1 -dimethylurea-induced fluorescence relaxation in algae subjected to ionic stress. Low-temperature fluorescence emission spectra indicated that salt stress enhanced photosystem-I emission in the dark, and a comparison of simultaneous emissions at 695 and 720 nm at room temperature indicated a further increase in photosystem-I emission during the fluorescence transients. Taken together with the decrease in the fast phase of 3-(3',4'dichlorophenyl)-1,1-dimethylurea-induced fluorescence relaxation in stressed algae, our results indicate that ionic stress stimulates cyclic electron flow, and that non-cyclic flow is inhibited. The effect of sucrose-induced osmotic stress was similar to, but less marked than, the effects of NaC1 and KC1; the effect of decreasing the external salinity was small.

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