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Published online by Cambridge University Press: 27 March 2009
In recent studies of variability in carrot (Umlauf, 1978; Dowker & Gray, 1985) it was concluded that increasing the genetic uniformity of the seed populations did not bring about a detectable reduction in the variability in embryo sizes, the spread of emergence or seedling weight. In these experiments, however, only broad comparisons were possible since the seed sources used were not obtained from crops grown under identical cultural conditions or harvested at the same stage of maturity, both of which affect variability in the subsequent crop (Gray & Steckel, 1983). The purpose of the present experiment was to examine the influence on variability of the greater genetic uniformity of an F1-hybrid compared with an open-pollinated cultivar, when both were sown under identical conditions.