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- Author or Editor: H. C. Kirkpatrick x
Abstract
Aluminum concentrations of 0, 3, 10, 30, and 100 ppm in nutrient solution reduced proportionately the dry weights of stem, roots, and leaves of seedlings of ‘Lovell’ peach [Prunus persica (L.) Batsch]. Roots grown at 30 and 100 ppm A1 were shorter, thicker, and had less branching than roots grown at lower concentrations. The epidermal and endodermal cells were small, with grossly thickened cell walls. Cells of the cortex were shortened in the longitudinal axes. Leaf A1 level indicated solution A1 better than did the A1 levels of roots, stems, or the 2% acetic acid-extractable A1 fraction of leaves, stems, or roots. The concentration of Ca, Mg, Mn, and P were reduced as A1 concentration increased.
Abstract
‘Elberta’ (Prunus persica (L.) Batsch) peach seedlings were grown in nutrient solutions for 27 days with aluminum concentrations of 0, 222, 666 and 2000 μ m; the 2000 μ m concentration induced A1 toxicity symptoms in leaves and severely restricted root growth. The early stage of A1 toxicity was characterized by marginal chlorosis that later developed into necrotic areas that extended along the veins toward the midrib. Advanced stages of toxicity were characterized by collapse of the midrib, terminal dieback and defoliation of the seedlings which are typical symptoms of calcium deficiency in peaches. At high A1 concentrations roots died back and new roots developed as irregularly shaped cylinders with constrictions and enlargements at the root apex.