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Physiological, biochemical and nutritional aspects in Schizolobium parahyba var. amazonicum (Huber ex Ducke) plants under different zinc supplies

  • Biochemistry & Physiology - Original Article
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Abstract

Schizolobium parahyba var. amazonicum (Huber ex Ducke) is an Amazonian native species with great economic importance and wide natural distribution, being the most commonly used tree in Brazilian silviculture. Imbalance zinc (Zn) application causes negative impacts on photochemical efficiency, gas exchange, antioxidant responses, nutritional status and growth. However, there are still no studies focused on Zn fertilization and better dose response in young S. parahyba plants available in the literature. The aim of this research was to understand how zinc (Zn) supply modulates biomass accumulation, nutritional status, chlorophyll a fluorescence, gas exchange, photosynthetic pigments and stress indicators in young S. parahyba plants. The experiment was randomized into five treatments (0.2, 2, 500, 1000, and 2,000 μM Zn). The highest biomass accumulation was observed in plants treated with 500 μM Zn. Leaf dry matter (LDM), root dry matter (RDM) and stem diameter (SD) were 70%, 67% and 28% lower in plants under Zn deficiency (0.2 µM), as compared with the 500 μM Zn treatment, respectively. Plants exposed to Zn excess (2,000 µM) exhibited minor values in LDM (32%), RDM (48%) and SD (25%), in comparison with better treatment (500 μM Zn). Light absorption and gas exchange suffered deleterious effects under limited Zn supply (0.2 μM), being confirmed by the lower effective quantum yield of PSII photochemistry (17%), electron transport rate (14%) and net photosynthetic rate (54%), comparing with 500 μM Zn. Stress indicators (superoxide and hydrogen peroxide) were increased after Zn stress and low concentrations of nutrients and chlorophylls were detected in plants exposed to deficiency or excess of Zn. This is the first study measuring chlorophyll a fluorescence in S. parahyba plants, in which it demonstrated that 500 μM Zn was the better dose response, inducing increases in biomass and stimulating the photosynthetic machinery.

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Data availability

Data are available upon request to the corresponding author.

Abbreviations

Ca:

Calcium

CAR:

Carotenoids

Chl a :

Chlorophyll a

Chl b :

Chlorophyll b

C i :

Intercellular CO2 concentration

CO2 :

Carbon dioxide

Cu:

Copper

E :

Transpiration rate

EL:

Electrolyte leakage

ETR:

Electron transport rate

ETR/P N :

Ratio between the apparent electron transport rate and net photosynthetic rate

EXC:

Relative energy excess at the PSII level

F0 :

Minimal fluorescence yield of the dark-adapted state

Fe:

Iron

Fm :

Maximal fluorescence yield of the dark-adapted state

Fv :

Variable fluorescence

Fv/Fm :

Maximal quantum yield of PSII photochemistry

g s :

Stomatal conductance

H:

Height

H2O2 :

Hydrogen peroxide

LDM:

Leaf dry matter

MDA:

Malondialdehyde

Mg:

Magnesium

Mn:

Manganese

NPQ:

Nonphotochemical quenching

O2 :

Superoxide

P:

Phosphorus

P N :

Net photosynthetic rate

P N/C i :

Instantaneous carboxylation efficiency

PSII:

Photosystem II

qP :

Photochemical quenching coefficient

RDM:

Root dry matter

ROS:

Reactive oxygen species

RuBisCo:

Ribulose-1,5-bisphosphate carboxylase/oxygenase

SD:

Stem diameter

SDM:

Stem dry matter

TDM:

Total dry matter

Total Chl:

Total chlorophyll

WUE:

Water-use efficiency

Zn:

Zinc

ΦPSII :

Effective quantum yield of PSII photochemistry

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Acknowledgements

This research had financial supports from Fundação Amazônia de Amparo a Estudos e Pesquisas (FAPESPA/Brazil), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq/Brazil) and Universidade Federal Rural da Amazônia (UFRA/Brazil) to AKS Lobato, while EMPJ was supported by scholarship from Programa de Educação Tutorial (PET/Brazil).

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Contributions

EMSGL and AKSL were the advisors of this project, planning all phases of the research and critically revised the manuscript. DMC, BCS, EMPJ and LRS conducted the experiment and performed physiological, biochemical and morphological determinations, as well as wrote and edited the manuscript. BLB performed nutritional determinations and helped interpreting the results. EMSGL and AKSL critically revised and edited the manuscript. All authors read and approved final version of manuscript.

Corresponding authors

Correspondence to Allan Klynger da Silva Lobato or Elaine Maria Silva Guedes Lobato.

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Callegari, D.M., Silva, B.C., dos Santos, L.R. et al. Physiological, biochemical and nutritional aspects in Schizolobium parahyba var. amazonicum (Huber ex Ducke) plants under different zinc supplies. Braz. J. Bot 45, 845–855 (2022). https://doi.org/10.1007/s40415-022-00812-5

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  • DOI: https://doi.org/10.1007/s40415-022-00812-5

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