Changes in formation and localizations of phenolic compounds, including flavans, were investigated in the tissues of European and Canadian yew (Taxus baccata L. and T. canadensis Marsh.) during dedifferentiation in vitro. Annual shoots of European yew had the highest capacity for synthesizing these compounds. During the summer growth period, the content of total soluble phenolic compounds and flavans in these shoots was 30–40% higher than in the winter. Cell dedifferentiation and growth in vitro was accompanied by enhanced synthesis of phenolic compounds, including flavans, the change in tissue localization of these compounds, and an increase in the number of cells containing phenolics. Significant accumulation of phenolic compounds in callus cells resulted in necroses following two subcultures in the European and Canadian yew cultures initiated from summer explants, and following seven subcultures of the European yew calli initiated from winter explants. These data allow us to suggest that a high level of phenolic compounds in yew calli could be the reason for their necrosis.
Russian Journal of Plant Physiology – Springer Journals
Published: Sep 28, 2005
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