Pitanga cultivars ‘Lover’ and ‘Vermilion’ were introduced from California to Okinawa as a new tropical fruit crop. Characteristics of fruit growth and fruit quality of the new cultivars were observed. As a result of our study, we could harvest the fruits twice in a year, in spring and fall, in Ishigaki Island. The taste of the fruits harvested in fall (fall fruits) was better, with a higher Brix value of 17.0 compared to that of the fruits harvested in spring (spring fruits) which showed a Brix value of 12.0. It took about 50 days for the skin color of the spring fruit and 40 days for that of the fall fruits to become yellow (a* value 11.2 and b* value 32.1). Then, the fruit skin color changed to orange, red and dark red at an interval of two days and the fruits dropped after the development of a dark red color. For both spring and fall fruits, cumulative daily average temperature necessary for fruit maturation was 1200°C. Major organic acid of pitanga fruit was malic acid, and its concentration reached a peak when the fruit became yellow, and it decreased constantly until dark red fruits dropped. In contrast, the soluble solids content increased rapidly after orange color development and reached a peak when the fruits dropped. Sugar and acid ratio was 4:1 for orange color and 19:1 at the dark red color stage when the fruits dropped. These results indicate that harvesting fruits just before fruit drop is the optimum time to enjoy the best taste. Pitanga juice contained only a small amount of sucrose, while an equal amount of fructose and glucose. It was demonstrated that pitanga fruits contained a larger amount of polyphenol than guava, which is known to be a Myrtaceae fruit with a high content of polyphenol. The ratio of seed weight to fruit weight was high, i.e., approximately 10-20%. The new cultivars, ‘Lover’ and Vermilion’, exhibit a less resinous odor and lower tartness than Okinawan native seedlings, and they have an excellent taste and flavor, based on sensory test evaluation. As a result, these new cultivars are a promising new fruit crop in Okinawa.
View full abstract