Abstract
Significant fluctuations in meristemoid and root primordium formation in large populations of hypocotyl cuttings of Pinus radiata D. Don, incubated under constant conditions but established on different days, were observed. The variation in the mean root number in a given population is a result of two components: (a) the number of cuttings which root and (b) the number of primordia formed in individual cuttings. Rooting in response to applied methyleneoxindole was variable. However, this variability could be correlated with the mean root primordium number of the controls.
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