International Journal of Horticulture, 2024, Vol.14, No.2, 78-88 http://hortherbpublisher.com/index.php/ijh 80 hybrid varieties, also phenotypically tested for yield and quality; grey dots represent a genetically diverse group of 434 cultivated varieties from California and non-California, and other hybrids developed between 1775-2015 that lack phenotypic testing. Figure 3 shows significant differences in the PCA distribution of hybrid varieties with different genetic backgrounds, indicating rich genetic diversity. Elite × elite hybrids are concentrated on the right side of the PCA plot, suggesting closer genetic relationships and lower genetic diversity. In contrast, the coral and grey dots are more scattered throughout the plot, indicating more diverse genetic backgrounds. This genetic diversity is a valuable resource in breeding and crop improvement, providing potential genetic variations for future breeding efforts. Figure 2 Cumulative marketable fruit yields of modern short-day and day-neutral cultivars (hybrids) grown in coastal California locations over the 2015-2016 and 2016-2017 growing seasons Figure 3 Genetic diversity among early and modern strawberry hybrids
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