Sugar accumulation in highbush blueberry fruit as affected by artificial pollination with different pollen sources in relation to seed number, invertase activities and ABA content
2002
Kobashi, K. | Sugaya, S. | Fukushima, M. | Iwahori, S.
Flowers of ‘Weymouth’ highbush blueberries (Vaccinium corymbosum L.) were either artificially cross-pollinated with ‘Northland’ pollen, self-pollinated or open-pollinated. Subsequent fruit growth was monitored. Cross-pollinated fruit had significantly more brown (mature) seeds than self-pollinated or open-pollinated fruit. Cross-pollinated fruit were also larger than the others. Total sugar content was slightly higher during the early growth stage and much higher during the maturation stage in cross-pollinated fruit. Soluble acid invertase activity was higher in the cross-pollinated fruit during the early growth stage and the maturation stage than in the other fruit. Insoluble acid invertase activity was also higher in the cross-pollinated fruit during the maturation stage compared to other fruit. In the cross-pollinated fruit ABA content was higher during an early fruit growth stage and higher to some degree during the later maturation stage. These results indicate that artificial cross-pollination in highbush blueberries promote sugar accumulation in the fruit, and that seed number, the activity of acid invertases, and ABA content may be involved in the mechanism.
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