Cellular changes, accumulation pattern and intracellular localization of Cd, Pb and Zn in Festuca rubra L. cv. Merlin (Red Fescue) and Ocimum sanctum L. (Holy Basil)
1999
Cadiz, N.M. | De Guzman, C.C. | Davies, M.S. (Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Biological Sciences)
The tolerance of Festuca rubra cv. Merlin and Ocimum sanctum to elevated levels of Cd, Pb, and Zn was evaluated. The metals, in general, reduced the mitotic indexed in both species. However, the nuclear cell and cytoplasmic areas, and the DNA and protein densities were less affected by the metals in Festuca. The roots of Festuca accumulated higher metal concentration than its shoots, while an opposite pattern was observed in Ocimum. Festuca exhibited greater tolerance than Ocimum to the metals; hence, further tolerance study was conducted on the former. Electromicrographs of root meristem sections in Festuca revealed the presence of electron-dense granules in either the cell wall fractions or cytoplasm. The x-ray microanalysis of the granule showed elevated peaks of Pb in the cell walls, high peak of Zn in the cytoplasm, and Cd peaks in both cell and cytoplasm
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