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A semi-quantitative histochemical method for assessment of biochemical responses to osmotic stress in Coffea arabica leaf disks

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Abstract

A simple method set for assessing biochemical changes associated with osmotic stress responses was developed using coffee (Coffea arabica L.) leaf disks. Stress was induced by polyethylene glycol (PEG) exposure. Quantitative evaluation of tissue physiological stress parameters was carried out using analytical methods to validate the conversion of classic qualitative histochemical tests for localizing lipid peroxidation, hydrogen peroxide, and total xanthine alkaloids into semi-quantitative assays. Relative electrolyte leakage (EL%) and chlorophyll content (SPAD index) were also recorded. EL% levels of treated disks were higher than those of control ones, whereas SPAD indexes were comparable. Histochemical localization indicated that levels of lipid peroxidation, H2O2, and total xanthines were also higher under osmotic stress than in control conditions. Semi-quantitative data obtained by image processing of histochemical staining consistently matched quantitative evaluations. Chromatographic analyses revealed that theophylline and caffeine concentrations increased in the presence of PEG, whereas theobromine remained constant in relation to the control. The methods herein described can be useful to rapidly acquire initial data regarding biochemical osmotic stress responses in coffee tissues based on simple staining and imaging steps. Moreover, it is likely that the same method may be applicable to other types of stresses and plant species upon minor adjustments.

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Data Availability

The data supporting the findings of this study are available within the article and/or its supplementary materials.

Abbreviations

FAO:

Food and Agriculture Organization

ICO:

International Coffee Organization

EL:

Electrolyte leakage

EL%:

Relative electrolyte leakage

MS:

Culture medium (Murashige and Skoog culture medium)

PEG:

Polyethylene glycol 6000

H2O2 :

Hydrogen peroxide

SA:

Stained area

Ci:

Initial electrical conductivity

Cf:

Final electrical conductivity

SPAD:

Soil Plant Analysis Development (chlorophyll index)

TCA:

Trichloroacetic acid

TBA:

Thiobarbituric acid

MDA:

Malondialdehyde

FW:

Fresh weight

HPLC:

High-performance liquid chromatography

TB:

Theobromine

TP:

Theophylline

CF:

Caffeine

ROS:

Reactive oxygen species

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Acknowledgements

We thank Professor Dr. Jorge Ernesto de Araújo Mariath (Plant Anatomy Laboratory-LAVeg, UFRGS) for access to the stereoscopic microscope used in the analyses.

Funding

This work was supported by the Research Support Foundation of the State of Rio Grande do Sul (FAPERGS, Project 19/2551–0001709-0), the National Council for Scientific and Technological Development (CNPq, Project 310775/2021–3), the Coordination for the Improvement of Higher Education Personnel (CAPES, Finance code 001), and the Organization of American States (OAS).

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Correspondence to Arthur Germano Fett-Neto.

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De Palma, N., Fett-Neto, A.G. A semi-quantitative histochemical method for assessment of biochemical responses to osmotic stress in Coffea arabica leaf disks. Protoplasma (2024). https://doi.org/10.1007/s00709-024-01941-2

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  • DOI: https://doi.org/10.1007/s00709-024-01941-2

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