A1 Refereed original research article in a scientific journal
Drought stress-induced upregulation of components involved in ferredoxin-dependent cyclic electron transfer
Authors: Lehtimaki N, Lintala M, Allahverdiyeva Y, Aro EM, Mulo P
Publisher: ELSEVIER GMBH, URBAN & FISCHER VERLAG
Publication year: 2010
Journal: Journal of Plant Physiology
Journal name in source: JOURNAL OF PLANT PHYSIOLOGY
Journal acronym: J PLANT PHYSIOL
Volume: 167
Issue: 12
First page : 1018
Last page: 1022
Number of pages: 5
ISSN: 0176-1617
eISSN: 1618-1328
DOI: https://doi.org/10.1016/j.jplph.2010.02.006
Self-archived copy’s web address: https://research.utu.fi/converis/portal/Publication/1898122
Linear photosynthetic electron transfer, consisting of both Photosystem (PS) II and PSI, converts light energy into the chemical forms ATP and NADPH, whereas PSI cyclic electron transfer (CET) is exclusively involved in ATP synthesis. In the chloroplasts of higher plants, there are two partially redundant CET routes. The ferredoxin (FD) or ferredoxin-plastoquinone reductase (FQR)-dependent route cycles electrons from PSI to plastoquinone via ferredoxin (FD), while in the NDH-dependent route, NADPH donates electrons to the NDH-complex for reduction of the plastoquinone pool. In the present study, we show that drought stress induces transcriptional and translational upregulation of the PCR5 and PGRL1 genes, which are the only characterized components of the FQR-dependent CET thus far. In contrast, the expression of the NDH-H gene, a representative of the NDH-complex, did not differ between the drought-stressed and the control plants. The overall expression level of the ferredoxin-NADP(+)-oxidoreductase (FNR) genes increased upon drought stress, with a concomitant release of FNR from the thylakoid membrane. Moreover, drought stress accelerated the rate of P700(+) re-reduction, which may indicate induction of CET. Responses of the PSAE, FD and PSAD gene families upon drought stress are also described. (C) 2010 Elsevier GmbH. All rights reserved.
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