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- W1520642017 abstract "A wide range of physiological disorders has been reported within the first few hours of exposing intact plant roots to moderate levels of Al3+. Past microanalytic studies, largely limited to electron probe x-ray microanalysis, have been unable to detect intracellular Al in this time frame. This has led to the suggestion that Al exerts its effect solely from extracellular or remote tissue sites. Here, freeze-dried cryosections (10 [mu]m thick) collected from the soybean (Glycine max) primary root tip (0.3-0.8 mm from the apex) were analyzed using secondary ion mass spectrometry (SIMS). The high sensitivity of SIMS for Al permitted the first direct evidence of early entry of Al into root cells. Al was found in cells of the root tip after a 30-min exposure of intact roots to 38 [mu]M Al3+. The accumulation of Al was greatest in the first 30 [mu]m, i.e. two to three cell layers, but elevated Al levels extended at least 150 [mu]m inward from the root edge. Intracellular Al concentrations at the root periphery were estimated to be about 70 nmol g-1 fresh weight. After 18 h of exposure, Al was evident throughout the root cross-section, although the rate of accumulation had slowed considerably from that during the initial 30 min. These results are consistent with the hypothesis that early effects of Al toxicity at the root apex, such as those on cell division, cell extension, or nutrient transport, involve the direct intervention of Al on cell function." @default.
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- W1520642017 date "1994-11-01" @default.
- W1520642017 modified "2023-10-01" @default.
- W1520642017 title "Rapid Uptake of Aluminum into Cells of Intact Soybean Root Tips (A Microanalytical Study Using Secondary Ion Mass Spectrometry)" @default.
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- W1520642017 doi "https://doi.org/10.1104/pp.106.3.1107" @default.
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