Photosynthetica 2022, 60(1):136-146 | DOI: 10.32615/ps.2022.008

Limiting steps and the contribution of alternative electron flow pathways in the recovery of the photosynthetic functions after freezing-induced desiccation of Haberlea rhodopensis

K. GEORGIEVA1, A.V. POPOVA2, G. MIHAILOVA1, A.G. IVANOV2, 3, M. VELITCHKOVA2
1 Institute of Plant Physiology and Genetics, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
2 Institute of Biophysics and Biomedical Engineering, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 21, 1113 Sofia, Bulgaria
3 Department of Biology, University of Western Ontario, 1151 Richmond Str. N, London, N6A 5B7 Ontario, Canada

Haberlea rhodopensis Friv. is unique with its ability to survive desiccation to an air-dry state during periods of extreme drought and freezing temperatures. To understand its survival strategies, it is important to examine the protective mechanisms not only during desiccation but also during rehydration. We investigated the involvement of alternative cyclic electron pathways during the recovery of photosynthetic functions after freezing-induced desiccation. Using electron transport inhibitors, the role of PGR5-dependent and NDH-dependent PSI-cyclic electron flows and plastid terminal oxidase were assessed during rehydration of desiccated leaves. Recovery of PSII and PSI, the capacity of PSI-driven cyclic electron flow, the redox state of plastoquinone pool, and the intersystem electron pool were analyzed. Data showed that the effect of alternative flows is more pronounced in the first hours of rehydration. In addition, the NDH-dependent cyclic pathway played a more determining role in the recovery of PSI than in the recovery of PSII.

Additional key words: alternative electron flow; chlorophyll fluorescence; cyclic electron flows; freezing-induced desiccation; rehydration.

Received: September 27, 2021; Revised: February 14, 2022; Accepted: February 16, 2022; Prepublished online: March 7, 2022; Published: March 18, 2022  Show citation

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GEORGIEVA, K., POPOVA, A.V., MIHAILOVA, G., IVANOV, A.G., & VELITCHKOVA, M. (2022). Limiting steps and the contribution of alternative electron flow pathways in the recovery of the photosynthetic functions after freezing-induced desiccation of Haberlea rhodopensis . Photosynthetica, 60(SPECIAL ISSUE 2022), 136-146. doi: 10.32615/ps.2022.008
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