|Title:||夏威夷品種木瓜在臺灣試種與雜交一代之表現||Other Titles:||Performances of Hawaiian Papayas and Their First Generations (F1) of Cross Hybrids Grown at Chia-Yi, Taiwan||Authors:||張振宙
|Issue Date:||5-Dec-1974||Publisher:||農業試驗所||Journal Volume:||23||Journal Issue:||4||Start page/Pages:||273-283||Source:||農業研究||Abstract:||
1. Among the papaya varieties of Hawaiian strains introduced from Hawaii in 1967, the Kapoho, Sunrise and A5 were found to be better in fruit qualities and more suitable to grow at Chia-Yi Agricultural Experiment Station, but each of the three varieties has shown the qualified satisfactions. The Kapoho variety has been, in most time, to have the first fruits very highly setting on the plants attributing to the vigorous growth of the young plants, and the fruits tended to be smaller; The Sunrise variety was to have its fruits with most water content, and the A5 variety, dwarfish in growth, selected from the seeds of some fruit bought in a super market in Honolulu, when the Author was in Hawaii in 1967, has been poor in yield and produced most carpellodic fruits attributing to the influence of the low temperature in the winter at Chia-Yi.
2. The low temperature in the winter at Chia-Yi, has evidently induced the production of sex changed flowers and carpellodic fruits formed on the tree. According to this experiment, it was found that the Hawaiian papayas could produce in the winter of the first cropping year, 27% of pentandria fruits, 69% of carpellodic or deformed fruits and 4% of normal fruits.
3. The fruits matured in 132-144 days since the flowers opened in the warm season, if the fruits developed through a period of cold weather, they would delayed to come to mature and 160-237 days were required.
4. Sugar content of the fruit developed during the cold season tended to decrease from
17-16° Brix to 11-9° Brix, when it matured. Fruits of different varieties had different
degrees of diminution of sugar content. The range of diminution of sugar content of the fruits of A5 was 40%; Sunrise, 30%; A5 × Sunrise (F1), 36% and Kapoho × A5 (F1), 37%, while that of the varieties grown at Waimanalo, Oahu, Hawaii was 3.5%.
Qualities of the fruits with diminished sugar content became much inferior.
5. Hermaphroditic plants of Kapoho variety was found to produce sex changed flowers at any season of the year. The lowest percentage of the sex Changed flowers opened in July was 1.6, while the highest percentage of the sex changed flowers opened in April was 100.
6. Average numbers of the normal fruits of the Sunrise, Kapoho and A5 varieties, harvested in the first cropping year were 47.8, 59.2, 46.0 respectively, but the average numbers of the normal fruits of the same varieties with the weights more than 300 grams, or suitable to the requirements of the market were 31.3, 16.0 and 16.0 respectively.
7. Perfomances of the F1 of cross-breeding with the Hawaiian varieties have shown as; (1) dwarf in plant growth is dominant, (2) yellow color of the fruit flesh is dominant over the red color, (3) water content of the fruit flesh tended to, diminish, when the variety of the lower water content crossed with the variety of the higher water content, (4) fruit size, shape, and yield tended to be intermediate between the parentages, (5) the average numbers of the normal fruits produced in the first cropping year by the varieties A5, Sunrise, A5 × Sunrise (F1) and Kapoho × A5 (F1) were 22.0, 34.5, 50.6 and 28.4 respectively. Yield of A5 × Sunrise (F1) is better. (6) Shipping qualities of the fruits of A5 × Sunrise (F1) and Kapoho × A5 (F1) were about the same as that of the Kapoho variety.
|Appears in Collections:||1.台灣農業研究(1950～迄今)|
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