碩士 / 國立臺灣大學 / 園藝暨景觀學系 / 103 / In top-grafting pear production, pear scions would be renew every year. Most pear scions are imported from Japan and some from high altitude area in Taiwan. It is concerned that the source, quality and quarantine of the imported pear scion in doubt. In this research, we investigated the relationship of flower bud development, budburst, and shoot content with dormancy in shoot of ‘Shinko’ (pyrus pyrifolia Nakai). Vegetative buds and nonbearing shoots of the Top-grafted ‘Shinko’ pear were labeled in February 2014. Shoots were pruned to shoots with three 3 buds every months after March. We investigated the development of shoot and bud to study floral formation and dormancy of the shoots. We hope to directly produce ‘Shinko’ pear scion in lowland area. The shoots pruned in March grown to 111.8±32.4 cm in length. The new shoot length gradually reduced with the delayed of pruning time. The shoots pruned after July did not form any floral bud. It shows that the buds were turned into dormancy after July. The ratio of reproduction buds was about 27-33% in August, and 84% in September. In the same time, the ration of floral bud was lower in Lishan area, about 60%. Shoots pruned in March and April formed floral buds in August. The tip of small flower buds on the inflorescence began browning in September. The shoots pruned in May formed floral buds in September and the flowers on the inflorescence were not turned brown. It showed that flower buds quality affected by environment in lowland area. The percentage of bud break of one-eye cutting of ‘Shinko’ shoots in March was 63.75%, and 54.78% in April. The percentage of bud break of one-eye cutting of ‘Shinko’ shoots in May reduced, about 25%. It shows that the buds accumulated dormancy inductuion hormone after May. The leaf nitrogen contents of pruned in March and April shoot gradually decrease with the delayed of pruning time. Before buds were turned into dormancy, leaf nitrogen moved into shoot, and transformed into amino acid for cold torlence. Carbohydrates of pear shoots were composed of starch and with 80% ethanol soluble as minor after September. The starch content of shoots pruned in March and April dramatically raise in September. The content of 80% enthanol soluble was about 17 mg/g dw in June, higher than other collections.Carbohydrates was not affected by the pruning time. Shoots pruned after May might avoid necrosis improving bud flower quality. Furture, it is possible that using shoots purning in May to produce pear scions in lowland in Taiwan.
| Identifer | oai:union.ndltd.org:TW/103NTU05378041 |
| Date | January 2015 |
| Creators | Meng-Fen Chang, 張萌芬 |
| Contributors | 陳右人 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 65 |
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