Twelve genotypes representing a wide range of autumn cauliflower were grown in two seasons from six seedling propagation treatments in three sequential sowings. Genotypes differed in their mean time of maturity and spread of maturity, and in their sensitivity to environment for these characters. Those genotypes derived from self-incompatible stocks showed greater stability than those from self-compatible stocks. In particular, a National Vegetable Research Station breeding line 'KC' revealed outstanding stability and is thus a potential new variety. The best environments for discriminating between genotypes were those which gave the least check to early growth.
Cauliflower, Brassica oleracea var . botrytis, incompatibility, heterosis . SUMMARY Cauliflowers representing those maturing in Britain in autumn, winter and spring were assessed for self-compatibility by self-pollen tube growth . A tendency existed for groups taking longer to mature to be more self-incompatible, but a range of incompatibilities was apparent in all groups . These results complement those of other workers .It is argued that despite demonstrable heterosis within many groups of cauliflowers, radical advances are probably best made by selecting self-compatible material from annual x biennial hybrid populations .
Purple colourations of the cauliflower curd detract from the commercial value of the crop. Curds were found to develop purple colourations when in aseptic nutrient culture, and this was correlated with their inherent tendencies to form purple curds in the field as revealed by a progeny test. It was advocated that selection against the defect in the field should be supported by assessment in culture.
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