Plant and Cell Physiology, 1990, Vol. 31, No. 2 173-177
© 1990
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Utilization of Anhydrous Aluminum Phosphate as a Sole Source of Phosphorous by a Selected Carrot Cell Line
1Laboratory of Plant Nutrition, Department of Agricultural Chemistry, Faculty of Agriculture, Tohoku University 1-1 Tsutsumidori-Amamiyamachi, Aoba-ku, Sendai, Miyagi, 981 Japan
2Laboratory of Plant Cell Engineering, Department of Agricultural Chemistry, Faculty of Agriculture, Tohoku University 1-1 Tsutsumidori-Amamiyamachi, Aoba-Ku, Sendai, Miyagi, 981 Japan
Two variants of carrot (Daucus carota L. cv. MS Yonsun) cell lines, which had been selected with Al-phosphate as a sole source of phosphorous, were characterized on their mechanisms of phosphate-utilization from Al-phosphate. Both cell lines excreted citrate into the medium. The amount of citrate excretion was highly correlated with cell growth in the presence of Al-phosphate. There was about a 1 to 1 correlation between solublized-Al and excreted-citrate in the medium during cell growth. These results suggest that 1) the citrate could chelate with Al, at a 1 to 1 ratio, in Al-phosphate, 2) the citrate-chelated Al remains outside the cells, and 3) solublized phosphate from Al-phosphate is utilized for the growth of carrot cells. The characteristics of the selected cells were very stable, since the rate of citrate-excretion showed no change after subculturing 25 passages without Al-phosphate.
(Received August 7, 1989; Accepted October 19, 1989)
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