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Aluminum distribution in freeze dried roots of cabbage brassica oleracea var capitata cultivar ballhead hybrid lettuce lactuca sativa cultivar pennlake and kikuyu grass pennisetum clandestinum cultivar whittet by energy dispersive x ray analysis



Aluminum distribution in freeze dried roots of cabbage brassica oleracea var capitata cultivar ballhead hybrid lettuce lactuca sativa cultivar pennlake and kikuyu grass pennisetum clandestinum cultivar whittet by energy dispersive x ray analysis



Australian Journal of Plant Physiology 7(1): 101-111



The Al distribution in transverse sections of fractured and freeze-dried roots of cabbage, lettuce and kikuyu grass was studied by energy-dispersive X-ray analysis. The mean ratios of the integrated counts corresponding to K.alpha. emission spectra for Al, P and Si were recorded between Al and control treatments over 3 experiments. Peak-to-background ratios (PA/B) were calculated and the Al ratios corrected for variations in the corresponding total Si ratios. Al was uniformly distributed along roots of the 3 spp. The highest peaks (PA) and peak-to-background ratios, suggesting higher concentrations, were recorded in the epidermis followed by the cortex. Al was recorded in the stele of all species and in the protoplasm of cortical cells, with smaller amounts in the protoplasm of xylem parenchyma cells for lettuce and kikuyu grass. The distribution of Al supports the hypothesis that its entry into the stele can be achieved by transport both into meristematic cells and the symplasm via the cortex and hence bypassing the barrier at the endodermis. The latter evidence was supported by the presence of Al in the radial wall (and cytoplasm) of the endodermis for each species. There was a poor correlation between the distribution of Al and P.

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Accession: 004706930

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