Effect of Low Concentrations of Aluminum on Growth and Water and Nutrient Uptake by Cotton Roots1
- J. C. Lance and
- R. W. Pearson2
Using a split root technique, the roots of 8-day-old cotton seedlings (Gossypium hirsutum ‘Empire’) were exposed to concentrations of 0, 0.15, 0.225, and 0.30 ppm Al for periods varying from ⅓ to 12 hours. Reductions in root weight and Ca uptake were the only effects observed after roots were exposed to 0.30 ppm Al for 1 hour. After longer exposures the uptake of water, Ca, Mg, K, P, and NO3 from ¼ Hoagland's solution was reduced. The curve of relative uptake vs. Al concentration was about the same in each case. The inhibition of Ca uptake was avoided by increasing the Ca concentration to 15 mM. Increasing the osmotic pressure did not accentuate the effect of Al on water uptake. The inhibition of all types of uptake indicates that the permeability of the plasmalemma is reduced. This might be due to interference in a function of Ca.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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