Phenology and Carbohydrate Metabolism of Japanese Pear Trees Grown under Continuously High Temperatures
Phenology and Carbohydrate Metabolism of Japanese Pear Trees Grown under Continuously High Temperatures
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DOI：
10.2503/jjshs.65.55
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发表时间：
1996
影响因子：
--
通讯作者：
J. Rakngan;H. Gemma;S. Iwahori
中科院分区：
文献类型：
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作者：
J. Rakngan;H. Gemma;S. Iwahori
为评价连续3年高温条件对6年生日本梨（Pyres pyrifolia Nakai cv.）生长性能的影响，进行了连续3年的研究。Kosui)。在高温条件下，日本梨的生理特性发生了变化，即在第一年，7月和9月转入温室的梨树比11月转入温室的梨树更健壮。在秋季和春季，7月转移的树木没有积累足够的低温，影响了后期的梢部生长；与10月和11月转移的树木相比，9月转移到温室的树木枝数最短。11月移栽的树比7月和10月移栽的树发芽早，花蕾好，开花均匀，结果多。处理3的花粉萌发率高于处理1和处理2。第二季和第三季的结果相似。我们的分析显示，在秋季休眠前，糖分增加，而淀粉减少。当春季恢复生长时，淀粉增加，糖减少。后来转移到温室的树木受到更多的冷却，淀粉和糖的含量更高。
The study was conducted for 3 consecutive years to evaluate the effect of continuous high temperature conditions on the performance of 6-year-old Japanese pear (Pyres pyrifolia Nakai cv. Kosui). Under high temperature condition, the physiological characteristics of Japanese pear changed, namely, in the first year, pear trees that were transferred to a greenhouse in July and September were more vigorous than those transferred in November. During the autumn and spring, trees transferred in July did not accumulate sufficient chilling temperature, affecting the shoot growths in the later years; those transferred to the greenhouse in September had the shortest shoots compared to trees transferred in October and November. Trees which were transferred in November had earlier budbreak, better flower buds, flowered more uniformly, and set more fruit than did trees which were transferred in July and October. Furthermore, pollen grains from Treatment 3 germinated better than did those from trees in Treatment 1 and 2. Similar results were obtained in 2nd and 3rd seasons.Our analyses revealed that sugars increased in autumn just before dormancy while starch decreased. When the growth resumed in spring, starch increased and sugar decreased. Trees transferred to the greenhouse later which received more chilling had a higher starch and sugar contents.