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Selenium biofortified Aechmea blanchetiana (Bromeliaceae) can resist lead-induced toxicity during in vitro culture

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Abstract

Lead (Pb) is a heavy metal that can induce morphophysiological changes and disturb the normal functioning of plants. However, the deleterious effects caused by exposure to heavy metals can be alleviated by co-exposure to some mineral elements such as selenium (Se). We analyzed the morphophysiological changes of Aechmea blanchetiana in response to Pb and Se co-exposure during in vitro growth. First, the plants were cultured in media containing 0 or 4 µM Se. After 72 days of culture with both Se treatments, a sterilized solution containing Pb in a concentration gradient (0, 500, 1000, or 2000 µM) was added, forming a two-phase medium with eight treatments. At 75 days of Se and Pb treatment, the changes in physiology and anatomy of the plants were verified. The number and diameter of xylem vessels of the leaves decreased with rising Pb concentrations. Plants grown without Se and supplemented with Pb presented characteristics of stress, such as lower content of photosynthetic pigments, magnesium and manganese, and lower RC/CSM. In contrast, plants cultured with Se had higher pigment content and better performance of photosynthetic apparatus, as confirmed by the negative K- and L-bands and PI(Total) values. Both Pb and Se alone and their combined use affected the growth, physiology, and anatomy of A. blanchetiana plants. This species can be used as a bioindicator agent due to its bioaccumulation capacity and tolerance to excess Pb.

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Abbreviations

ABS/CSM :

Absorbed photon flux per excited cross section of PSII

Car:

Carotenoids

Chl a :

Chlorophyll a

Chl b :

Chlorophyll b

DI0/CSM :

Dissipated energy flux per cross section of PSII

ET0/CSM :

Potential electron transport per cross section of PSII

F0 :

Initial fluorescence

FM :

Maximum fluorescence

FV :

Variable fluorescence

FV/F0 :

Ratio of the de-excitation rate constants for photochemical and non-photochemical events

M0 :

Net rate of photosystem II closure

OEC:

Oxygen-evolving complex

PI(Total) :

Total performance index

PS I:

Photosystem I

PS II:

Photosystem II

QA :

Quinone A

QB :

Quinone B

RC/CSM :

Total number of PSII active reaction centers

TR0/CSM :

Maximum trapped exciton flux per cross section of PSII

VI :

Relative variable fluorescence at 30 ms (step I)

VJ :

Relative variable fluorescence at 2 ms (step J)

φP0 :

Maximum quantum yield of primary photochemistry of PSII reaction center

φE0 :

Quantum yield of electron transport

φD0 = F0/FM :

Quantum yield of energy dissipation

ΨE0 :

Probability that a trapped exciton moves an electron into the electron transport chain beyond QA

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Acknowledgements

The study was funded by Fundação de Amparo à Pesquisa e Inovação do Espírito Santo (FAPES; Vitória, Brazil; Grant 1005/2015) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). JPRM received post-doctoral fellowships from Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (PNPD/CAPES). The authors are also thankful to Luiz Carlos de Almeida Rodrigues for preparing the figures and Pollyanna Braga Machado's technical support.

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Correspondence to João Paulo Rodrigues Martins.

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Communicated by M. Capuana.

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Martins, J.P.R., Conde, L.T., Falqueto, A.R. et al. Selenium biofortified Aechmea blanchetiana (Bromeliaceae) can resist lead-induced toxicity during in vitro culture. Acta Physiol Plant 43, 149 (2021). https://doi.org/10.1007/s11738-021-03323-0

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  • DOI: https://doi.org/10.1007/s11738-021-03323-0

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