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4.3 Results 113

4.3.1 Partitioning of variance components 113

4.3.2 Comparison of head weight and other horticulture traits

over the environments 115

4.3.3 Repeatability and genetic correlations 120

4.3.4 Comparison of cultivar rankings for head weight and

other traits per cultivar 120

4.3.5 Stability of genotype performance 125

4.3.6 Correlation among horticulture traits 125

4.4 Discussion 127

4.4.1 Relative importance of Management system,

Location, and Season 127

4.4.2 Cultivar ranking and stability in Management systems 129

4.4.3 Repeatability as afected by Management systems 131

4.4.4 Breeding broccoli for organic systems 133

References
136

Chapter 5 Variation in broccoli cultivar phytochemical content under

organic and conventional management systems: Implications

in breeding for nutrition 141

5.1 Introduction 143

5.2 Materials & Methods 147

5.2.1 Plant Material and Field Trial Locations 147

5.2.2 Field Data Collection 147

5.2.3 Broccoli Floret Samples and glucosinolate, tocopherol

and carotenoid analysis 149

5.2.4 Statistical Analysis 149

5.3 Results 151

5.3.1 Comparison of phytochemicals means over

the environments 151

5.3.2 Partitioning of variance components 152

5.3.3 Repeatability, genetic correlation and ratio of

correlated response to direct response 153

5.3.4 Comparison of cultivar ranking for phytochemical

concentration and stability across trials 155

5.3.5 Comparison of phytochemical concentration by

genotype classiication 156