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Auxin control of calcium mediated peroxidase ec 1.11.1.7 secretion by auxin dependent and auxin independent sugar beet beta vulgaris cells/



Auxin control of calcium mediated peroxidase ec 1.11.1.7 secretion by auxin dependent and auxin independent sugar beet beta vulgaris cells/



Phytochemistry 22(12): 2657-2660



Peroxidase secretion by 3 sugarbeet cell lines in the absence of Ca2+ was unaffected by the addition of auxins of different chemical structures. The 6 auxins tested had no effect on the Ca2+-promoted peroxidase secretion by habituated non-organogenic cells (HNO), but they enhanced the secretion by normal non-organogenic cells (NNO) and 3 inhibited it in the case of the habituated organogenic line. A 5 wk subculture of the auxin-independent HNO callus on auxin-containing media increased the sensitivity of cells to Ca2+ and their responsiveness to auxins in suspension cultures. Subculture of the auxin-requiring NNO callus on auxin-deficient medium induced a decreased sensitivity to Ca2+ and a complete loss of response to auxins. The possible regulation of peroxidase secretion by Ca2+- and auxin-receptors is discussed.

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