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Calcium Uptake and Transport by Wheat Seedlings as Affected by Aluminum¹

ABSTRACT

Uptake and distribution of Ca was studied with excised roots and intact seedlings of wheat. Patterns characteristic of inorganic ion uptake by roots were obtained, namely a rapid initial adsorption phase followed by a linear rate of accumulation. The former was relatively large compared to the latter. It also was reduced to a greater extent by increasing acidity from pH 6 to pH 4. The Ca accumulation phase was reduced by modest restrictions in aerobic metabolism. Treatments resulting in severe reductions in metabolism produced a loss of internal inorganic cations and an increase in influx of external Ca indicating serious objections to the sole use of isotopic procedures for ion uptake studies under such extreme conditions.

Aluminum treatments reduced both the adsorption and accumulation phases of Ca uptake. The reduction in the accumulation phase could not be overcome by supplying additional Ca. Increasing the Al concentration from 10^-4N to 10^-3N at constant Ca did not alter the extent of inhibition, suggesting that a portion of the Ca accumulation mechanism was inactivated completely by Al at 10^-4N or less.

Transport of Ca to shoots of intact seedlings also was restricted by Al although appreciable transport still occurred when root uptake was inhibited completely.

¹ Contribution from the Dept. of Soil Science, North Carolina State of the Univ. of N. C. at Raleigh, and published with the approval of the Director of Research as Paper No. 1659 of the Journal Series. Supported by The Atomic Energy Commission, Contract No. AT-(40-1)-2410. Presented before Div. IV, Soil Science Society of America, Aug. 22, 1962.

² Graduate Assistant and Associate Professor. The senior author is now at the USDA Regional Soybean Laboratory, Urbana, Ill.

Received for publication August 19, 1963. Accepted for publication December 6, 1963.