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Morphological,anatomical, and ultrastructural changes (visualized through scanning electron microscopy) inducedin Triticum aestivum by Pb2+ treatment
Authors:Gurpreet Kaur  Harminder Pal Singh  Daizy Rani Batish  Ravinder Kumar Kohli
Affiliation:1. Department of Environment Studies, Panjab University, Chandigarh, 160014, India
2. Department of Botany, Panjab University, Chandigarh, 160014, India
Abstract:Lead (Pb) causes severe damage to crops, ecosystems, and humans, and alters the physiology and biochemistry of various plant species. It is hypothesized that Pb-induced metabolic alterations could manifest as structural variations in the roots of plants. In light of this, the morphological, anatomical, and ultrastructural variations (through scanning electron microscopy, SEM) were studied in 4-day-old seedlings of Triticum aestivum grown under Pb stress (0, 8, 16, 40, and 80 mg Pb2+ l?1; mild to highly toxic). The toxic effect was more pronounced in radicle growth than on the plumule growth. The SEM of the root of T. aestivum depicted morphological alterations and surface ultrastructural changes. Compared to intact and uniform surface cells in the control roots, cells were irregular and desiccated in Pb2+-treated roots. In Pb2+-treated roots, the number of root hairs increased manifold, showing dense growth, and these were apparently longer. Apart from the deformity in surface morphology and anatomy of the roots in response to Pb2+ toxicity, considerable anatomical alterations were also observed. Pb2+-treated root exhibited signs of injury in the form of cell distortion, particularly in the cortical cells. The endodermis and pericycle region showed loss of uniformity post Pb2+ exposure (at 80 mg l?1 Pb2+). The cells appeared to be squeezed with greater depositions observed all over the tissue. The study concludes that Pb2+ treatment caused structural anomalies and induced anatomical and surface ultrastructural changes in T. aestivum.
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