ISHS Acta Horticulturae 567: IV International Strawberry Symposium
IS IT POSSIBLE TO BREED STRAWBERRY CULTIVARS WHICH CONFER FIRMNESS AND SWEETNESS?? |
| Authors: | K. Yashiro, K. Tomita, H. Ezura |
| Keywords: | Akihime, European cultivars, Japanese cultivars, soluble solids, Tochiotome |
| Abstract:
A genetic analysis of the fruit firmness of European lines and the sweetness of Japanese cultivars was performed in strawberry (Fragaria x ananassa). We have used ‘Akihime’ and ‘Tochiotome’ as Japanese cultivars with sweetness, and ‘S6’ and ‘S13’ which were selected among the seedlings obtained from European commercial fruits as European lines with firmness. The crosses of ‘Akihime’בS6’, ‘Tochiotome’בS13’ and ‘Akihime’×’Tochiotome’ were performed in the middle of February in 1999. Their seeds were sown on April 21st in 1999, and seedlings were transplanted on September 22nd in a greenhouse. The seedlings were grown according to forcing culture. Two mature fruits over 10g were harvested from each plant by the beginning of March in 2000, and firmness (Kg/Ř5mm) and percent soluble solids (Brix %) as sweetness of fruits were measured. The firmness and the sweetness were 0.35Kg and 11.9% in ‘Akihime’, 0.49 Kg and 12.0% in ‘Tochiotome’, 0.75Kg and 6.3% in ‘S6’, and 0.67 Kg and 5.3% in ‘S13’, respectively. Values for both traits in the three F1 seedling populations distributed continuously and the correlation coefficients between firmness and sweetness were not significant. These results indicate that firmness and sweetness of fruits are independent characteristics and both traits are controlled by polygenes. Therefore, it is possible to breed strawberry cultivars conferring both the firmness of European lines and the sweetness of Japanese cultivars. | |
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