Abstract
Callus cultures were used to investigate and delineate responses of potato to iron (Fe) deficiency conditions over different culture durations. The morphological responses included chlorotic symptoms, reduced fresh weight and area of callus growth on Fe-deficient medium compared to calli grown under Fe sufficient conditions. Biochemically, potato calli under Fe deficit exhibited decreases in chlorophyll and carotenoid contents, reduction in activities of antioxidant enzymes (peroxidase, catalase and ascorbate peroxidase), as well as an increase in ferric chelate reductase (FCR) activity, lipid peroxidation, phenolic production and hydrogen peroxide (H2O2) level. Perls staining revealed sparse Fe distribution in Fe-deficient callus cells whereas Fe was widely distributed and intensely stained among numerous actively dividing cells in Fe-sufficient calli. These responses of calli to Fe deficiency were more pronounced with prolonged exposure to such stress leading to severe chlorosis and/or death of cells in chlorosis-susceptible calli but potential chlorosis-tolerant callus cells maintained their greenness and viability. Over a prolonged period in culture, significantly positive correlations were found among callus fresh weight, chlorophyll and carotenoid contents, antioxidant enzyme activities and lipid peroxidation as Fe supplies to the medium was increased. FCR activity was strongly correlated in a negative manner with Fe deficiency, chlorophyll content and peroxidase activity. The responses of calli to Fe supply can serve as reliable indicators for detecting chlorosis tolerance and/or nutrient deficiency stress.
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Acknowledgements
The authors wish to thank Dr. Louis Boamponsem and Dr. Seyedardalan Ashrafadeh for their excellent technical advice on methodologies and statistical analysis. Special thanks to Graeme Bull, Manfred Ingerfeld and Keum-Ah Lee for assistance with microscopy analysis and lab preparations.
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All three authors developed the laboratory analyses and reviewed the research. DWML and GAB designed the research project, read and revised the manuscript. GAB carried out the laboratory experiments and drafted manuscript. CL guided the laboratory analyses and reviewed results. DWML critically revised manuscript and approved final version to be published.
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Communicated by Sergio J. Ochatt.
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Boamponsem, G.A., Leung, D.W.M. & Lister, C. Relationships among iron deficit-induced potato callus growth inhibition, Fe distribution, chlorosis, and oxidative stress amplified by reduced antioxidative enzyme activities. Plant Cell Tiss Organ Cult 132, 393–412 (2018). https://doi.org/10.1007/s11240-017-1338-9
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DOI: https://doi.org/10.1007/s11240-017-1338-9