Abstract
Difficulty in F1 seed production in carrot has resulted in a much more delayed release of F1 varieties than in other major vegetables. In Japan, F1 varieties outnumbered the open-pollinated ones among the new varieties of carrot released during the period 1981-1987. In USSR, in spite of the active promotion of the use oi male sterility, F1 varieties do not prevail in commercial fields. F1 varieties of carrot are superior in yield, growih vigour, uniformity of top growih and root size and disease resistance. New methods involving biotechnology, especially tissue culture including synthetic seeds, are likely to play a major role in the breeding and propagation of F1 varieties.
