Abstract
Peroxidase secretion by three sugarbeet cell lines in the absence of Ca 2+ was unaffected by the addition of auxins of different chemical structures. The six auxins tested had no effect on the Ca 2+ -promoted peroxidase secretion by habituated non-organogenic cells (HNO), but they enhanced the secretion by normal non-organogenic cells (NNO) and three of them inhibited it in the case of the habituated organogenic line. A 5-week subculture of the auxinindependent HNO callus on auxin-containing media increased the sensitivity of cells to Ca 2+ and their responsiveness to auxins in suspension cultures. Conversely, subculture of the auxin-requiring NNO callus on auxin-deficient medium induced a decreased sensitivity to Ca 2+ and a complete loss of response to auxins. The possible regulation of peroxidase secretion by Ca 2+- and auxin-receptors is discussed.
Published Version
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