or Cr(VI) was added in seven increments to plant nutrient solutions, to a final level of 0.044 ppm. The Cr was added over a 14-day period at flowering stage in bean and wheat plants. At maturity bean plants contained about 55% and wheat had removed 81% of the added 51Cr. Bean roots contained about 92% and wheat roots 95% of the total plant 51Cr. Seeds contained only 0.02 to 0.1% of the total plant 51Cr. Uptake and translocation of 51 Cr differed only slightly between the Cr(III) and Cr(VI) sources. Most of the 51Cr in fresh bean leaves was present as a soluble low molecular weight anionic complex that was not associated with any subcellular organelle. Rats fed the 51Cr-labeled bean leaves retained less than 0.5% of the dose after 48 hr.Recent evidence has shown that Cr is essential in animal and human nutrition (Mertz, 1969;Schroeder, 1968;Underwood, 1971). Although there is a lack of information on effective sources of dietary Cr, plants may be a major source of Cr for animals and man. This work was undertaken to determine how much Cr is taken up by plants
Chromium was not required for normal growth of romaine lettuce (Lactuca sativa L. subsp. longifolia), tomato (Lycopersicon esculentum Mill.), wheat (Triticum aestivum L.), or bean (Phaseolus vulgaris L.) in solution culture containing 3.8 x 10(-4) muM Cr. Plants grown on this purified nutrient solution contained an average of 22 ng Cr/g dry weight. Duckweed (Lemna sp.) grew and reproduced normally on a dilute nutrient solution containing 3.8 x 10(-5) muM Cr.
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