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Title: Can ceylon leadwort (Plumbago zeylanica L.) acclimate to lead toxicity? - studies of photosynthetic apparatus efficiency
Authors: Tokarz, Krzysztof M.
Makowski, Wojciech
Tokarz, Barbara
Hanula, Monika
Sitek, Ewa
Muszyńska, Ewa
Jędrzejczyk, Roman
Banasiuk, Rafał
Chajec, Łukasz
Mazur, Stanisław
Keywords: alternative electron transport; antioxidant enzymes; Chl fluorescence; heavy metals; photosynthesis; secondary metabolites
Issue Date: 2020
Citation: International Journal of Molecular Sciences, Vol. 21, iss. 5 (2020) art. no. 1866
Abstract: Ceylon leadwort (Plumbago zeylanica) is ornamental plant known for its pharmacological properties arising from the abundant production of various secondary metabolites. It often grows in lead polluted areas. The aim of presented study was to evaluate the survival strategy of P. zeylanica to lead toxicity via photosynthetic apparatus acclimatization. Shoots of P. zeylanica were cultivated on media with different Pb concentrations (0.0, 0.05, and 0.1 g Pb∙l−1). After a four-week culture, the efficiency of the photosynthetic apparatus of plants was evaluated by Chl a fluorescence measurement, photosynthetic pigment, and Lhcb1, PsbA, PsbO, and RuBisCo protein accumulation, antioxidant enzymes activity, and chloroplast ultrastructure observation. Plants from lower Pb concentration revealed no changes in photosynthetic pigments content and light-harvesting complex (LHCII) size, as well as no limitation on the donor side of Photosystem II Reaction Centre (PSII RC). However, the activity and content of antioxidant enzymes indicated a high risk of limitation on the acceptor side of Photosystem I. In turn, plants from 0.1 g Pb∙l−1 showed a significant decrease in pigments content, LHCII size, the amount of active PSII RC, oxygen-evolving complex activity, and significant remodeling of chloroplast ultrastructure indicated limitation of PSII RC donor side. Obtained results indicate that P. zeylanica plants acclimate to lead toxicity by Pb accumulation in roots and, depending on Pb concentration, by adjusting their photosynthetic apparatus via the activation of alternative (cyclic and pseudocyclic) electron transport pathways.
DOI: 10.3390/ijms21051866
ISSN: 1422-0067
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