Genotypic and environmental effects on the maturity time of autumn cauliflowers

Abstract

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.

Environmental Interaction and The Genetics of Flowering

“…A regression approach to genotype-environment interaction was first put forward by Yates & Cochran (199) and has since been used and developed by other workers (45, 49, 99). The regression of g/e is often linear and the regression coefficient and deviations from the regression mean square provide a measure of the sensitivity of the genotype to environmental change (49, 80,135). This information is useful in choosing parents for crossing programs and environments in which to discriminate genotypes (80 .…”

The use of related variables in explaining genotype-environment interactions

“…Our experience with this crop, including the data of Kesavan et al (1976), suggests that crowding in the seedbed might afford just such a discriminating environment without unduly affecting the expression of other agronomic traits which must be simultaneously selected for. This result also goes some way towards explaining why a genotype selected as giving high curd weights at Wellesbourne, where good agronomic practices ensure a short growing period, gave much smaller curds when grown away from there under condi-tions where the growing period was longer (Crisp and Gray, 1978), and is, perhaps, a salutary tale for plant breeders.…”

“…Correlations between the regression coefficients from equations (I) and (2) might occur if there were no overall environmental effect, but this is unlikely in practice. However, correlations between coefficients from equations (1) and (2) Kesavan et al (1976) described the effects of genotype, environment and GE interaction on time from sowing to maturity (expressed as the logarithm) in a trial of autumn-maturing cauliflowers. Crisp and Kesavan (1978) described the results for curd weight at maturity in the same trial.…”

Molecular genetics and breeding of vegetable brassicas

“…Earliness of curd formation in cauliflower appears to be dominant to lateness . The mean spread of maturity and consistency of spread over environments have been found to be under genetic control in autumn cauliflowers (Kesavan et al ., 1976) . Curd weight also has a high genetic component (Crisp & Kesavan, 1978) .…”