Abstract
Iron (Fe) toxicity in plant species depends on the availability of Fe in the soil, uptake ability by the root system, and translocation rate to other parts of the plant. The aim of this study was to assess Fe uptake by root tissues of Catharanthus roseus, translocation rate to leaf tissues, and the impairment of plant physio-morphological characteristics. Fe uptake by the roots (~ 700 µg g−1 DW) of C. roseus was observed during the early exposure period (1 week), and translocation factor from root to shoot was fluctuated as an independent strategy. A high level of Fe content in the root tissues significantly inhibited root length and root dry weight. Under acidic pH condition, an enrichment of Fe in the shoots (~ 400 µg g−1 DW) led to increase in leaf temperature (> 2.5 °C compared to control) and crop stress index (> 0.6), resulting in stomatal closure, subsequently decreasing CO2 assimilation rate and H2O transpiration rate. An increment of CSI in Fe-stressed plants was negatively related to stomatal conductance, indicating stomatal closure with an increase in Fe in the leaf tissues. High Fe levels in the leaf tissues directly induced toxic symptoms including leaf bronzing, leaf spotting, leaf necrosis, leaf chlorosis, and leaf senescence in C. roseus plants. In summary, C. roseus was identified as a good candidate plant for Fe phytoextraction, depending on Fe bioaccumulation, therefore 50 mM Fe treatment was designated as an excess Fe to cause the growth inhibition, especially in the prolonged Fe incubation periods.
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We would like to thank the National Science and Technology Development Agency (NSTDA), Thailand (Grant Number P-1851456) for funding support.
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This work was supported by the National Science and Technology Development Agency (NSTDA), Thailand (Grant Number P-1851456).
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Conceptualization: SC and RT. Formal analysis and investigation: RR, PP, TS, KC, TS. Writing and original draft preparation: RT. Writing and review and editing: SC. Funding acquisition: SC.
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Tisarum, R., Rika, R., Pipatsitee, P. et al. Iron (Fe) toxicity, uptake, translocation, and physio-morphological responses in Catharanthus roseus. Physiol Mol Biol Plants 29, 1289–1299 (2023). https://doi.org/10.1007/s12298-023-01379-5
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DOI: https://doi.org/10.1007/s12298-023-01379-5