The regenerative capacity of root cuttings of Taraxacum officinale under natural conditions

Author:

Mann H.,Cavers P. B.

Abstract

Plants of Taraxacum officinale Weber were grown from the seeds of a single parent. At monthly intervals during two successive growing seasons, and commencing [Formula: see text] months after germination in June 1974, randomly selected plants were excavated and the roots divided into 2 cm long fragments. Fragments were replanted at different depths and in different orientations.Percentage survival (regeneration and survival for at least 4 months) displayed seasonal variation with a minimum of 5–32% survival for fragments obtained in May 1975 at the time of maximum flowering of the source plants and for very young fragments obtained in the first treatment in July 1974. The highest percentage survival, 60–100%, occurred for fragments obtained in the second growing season from June to September, inclusive. Weather conditions appear to exert a significant effect on the magnitude of the flowering response, but not the timing of the spring flowering peak.Regenerative capacity declined consistently down the length of the root in relation to a concomitant decrease of fragment volume, but increased with respect to age for cuttings of a given volume. Rotation of cuttings away from the normal planting orientation resulted in a decline in percentage survival, and an increase in regeneration time. Depth of planting down to 10 cm did not consistently influence either percentage survival or time for regeneration.The time taken for regeneration was largely dependent on climate, with fragments planted in September 1974 regenerating most quickly (an average of 20 days), and fragments obtained in October 1974 taking the longest time to regenerate (174 days). In addition, time for regeneration was positively correlated with fragment volume. These results show that under natural conditions survival of fragments is not independent of season, and is significantly lower than 100% as previously reported from laboratory studies of regeneration.

Publisher

Canadian Science Publishing

Subject

Plant Science

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