Specific intra-tissue responses to manganese in the floating lamina of Trapa natans L

Plant Biology
Costanza BaldisserottoSimonetta Pancaldi

Abstract

Plant tolerance to heavy metals requires morpho-physiological mechanisms that are still poorly understood, especially in hydrophytes. This study focuses on the young floating lamina of the rhyzophyte Trapa natans exposed for 10 d to 130 microM Mn. The lamina has the ability to bioaccumulate Mn (> 3000 microg g(-1)). X-ray microanalysis of Mn cellular distribution revealed accumulation in the upper epidermis, in the first palisade layer, and in the idioblasts of the spongy tissue, which were shown with electron microscopy to contain osmiophilic vacuolar deposits, also observed to a minor extent in the control leaves. On the basis of biochemical and histochemical tests, these deposits were attributed to phenolic compounds that were probably able to chelate Mn. Net photosynthesis, photosynthetic pigments, room temperature microspectrofluorimetric analyses, and ultrastructural studies of plastids were performed to evaluate the status of the photosynthetic apparatus. A greater development of thylakoid membranes was observed in plastids of the second palisade and spongy tissue, which, however, did not accumulate Mn. Only the spongy tissue experienced inadequate assembly of PS II, but this did not significantly influence the photosynt...Continue Reading

References

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Citations

Feb 22, 2011·Journal of Bioenergetics and Biomembranes·Lorenzo FerroniSimonetta Pancaldi
Dec 25, 2012·Plant Physiology and Biochemistry : PPB·Lorenzo FerroniSimonetta Pancaldi
Jun 28, 2020·Environmental Geochemistry and Health·Sabina Rossini-OlivaEduardo Oscar Leidi

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