Summary
Callus from hypocotyls of white spruce (Picea glauca [Moench] Voss) was grown on agar under defined conditions with high levels of calcium nitrate. Transfer of callus to liquid suspension cultures and maintenance of suspensions either under a regime of constant temperature and light or under alternating conditions similar to those of a late spring day, affected the content of free sugars, tannins, and aldehydes. Under the alternating conditions the levels of these substances increased greatly compared to those under the constant environment. By contrast, vascularization of cell clumps, which was comparable to the differentiation of hypocotyls in seedlings, was obtained only under constant conditions. Cells at the centre of the clumps developed secondary wall thickenings and bordered pits, and were surrounded by cambial-like initials.
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Durzan, D.J., Chafe, S.C. & Lopushanski, S.M. Effects of environmental changes on sugars, tannins, and organized growth in cell suspension cultures of white spruce. Planta 113, 241–249 (1973). https://doi.org/10.1007/BF00390511
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DOI: https://doi.org/10.1007/BF00390511