ALUMINUM-TOLERANCE OF CARROT (DAUCUS-CAROTA L) PLANTS REGENERATED FROM SELECTED CELL-CULTURES

Aluminum-tolerant variants from cell cultures of carrot (Daucus carota L. cv. MS Yonsun) were selected by exposing them to excess ionic aluminum. The medium contained AlCl3 and 0.1 mm phosphate at pH 4.0. Under ionic aluminum stress (0.5-1.0 mm), 282 calli were selected. Twenty-eight fertile plants were regenerated from 7 selected calli. Based on the root elongation tests of the seedlings, the seeds displayed aluminum-tolerance. In the case of the cell line H7-08, the selection occurred at a frequency of ca. 6 X 10(-7) when the materials were plated on agar medium containing 0.5 mm aluminum.