Changes in ultrastructure and cytochemistry of the agarophyte Gracilaria domingensis (Rhodophyta, Gracilariales) treated with cadmium.

Protoplasma
Rodrigo dos SantosZenilda Laurita Bouzon

Abstract

The agarophyte macroalgae Gracilaria domingensis (Kützing) Sonder ex Dickie is widely distributed along the Brazilian coast. While this species produces agarana, it is more important in the human diet. Therefore, the present study aimed to evaluate the biological effects of cadmium on its morphology and cellular organization. To accomplish this, the effects of cadmium in apical segments of G. domingensis were examined in vitro. Over a period of 16 days, the segments were cultivated and exposed to photosynthetically active radiation (PAR) at 80 μmol photons m(-2) s(-1), with cadmium treatments in doses of 100, 200 and 300 μM. The samples were processed for light, transmission and scanning electron microscopy. Histochemical analyses included Toluidine Blue for acidic polysaccharides, Coomassie Brilliant Blue for total protein, and Periodic Acidic Schiff for neutral polysaccharides. In all cadmium treatments, cytochemical analysis showed 1) metachromatic granulation in vacuole and lenticular thickness of the cell wall, 2) a higher concentration of cytoplasmic organelles, and 3) an increase in the number of floridean starch grains. Cadmium also caused changes in the ultrastructure of cortical and subcortical cells, including increa...Continue Reading

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Citations

Jul 19, 2013·Environmental Science and Pollution Research International·Ying ZhangQiuxia Song
Feb 28, 2014·Environmental Science and Pollution Research International·Ying ZhangLei Wang
Jul 2, 2014·Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada·Marthiellen R de L FelixEder C Schmidt
Dec 4, 2015·Environmental Science and Pollution Research International·Ying ZhangShuwei Duan
Aug 25, 2015·Ecotoxicology and Environmental Safety·Tossapol LimcharoensukChoowong Auesukaree
Sep 23, 2014·Environmental Science and Pollution Research International·Ying ZhangPengjie Wang
Feb 15, 2018·Environmental Science and Pollution Research International·Fernando SchernerPaulo Antunes Horta
Mar 19, 2020·Environmental Science and Pollution Research International·Jiemin ChengYaqin Yu
Oct 23, 2020·Journal of Hazardous Materials·Youming DongZhengguo Song

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