Ryugaku Jinja · Professor Archive
Public Professor Archive
Yuka Watanabe渡部 由香
Kagoshima University · Division of Agricultural Sciences, School of Agriculture, Fisheries and Veterinary Medicine · 助教授
- Publications
- 4
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- 1
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- 6
留学
神社Kagoshima University · Division of Agricultural Sciences, School of Agriculture, Fisheries and Veterinary Medicine · 助教授
Research keywords辺塚だいだい・クマリン化合物・フラボノイド・抗酸化能・抗菌性・生体膜損傷
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- Hiejima S., Watanabe Y., Ugawa S. . Characteristics of bud endodormancy and physiology in Quercus acutissima seedlings growing in an environment with low chill availability . Journal o2024 · 記述言語: 日本語 出版者・発行元: Journal of Forest Research Global warming is expected to hamper bud endodormancy. Understanding endodormancy in low chill availability environments helps to predict endodormancy in future winters. The objective of this study was to elucidate characteristics of endodormancy and physiology in Quercus acutissima seedlings in a nursery under a vinyl sheet in the southern part of the warm-temperate zone. Endodormancy was evaluated by examining leaf phenology of seedlings in the nursery, and bud break of shoot cuttings in growth promoting conditions from October to March. Water content (WC), relative water content (RWC), respiration rate, concentrations of starch, and sugars (glucose, fructose, and sucrose) were measured in twigs and buds of current-year shoots. As leaves decolorized towards December, bud break rates increased. Complete leaf browning paralleled low bud break rates in January and February indicating endodormancy. Compared to species in high chill availability environments which typically enter endodormancy in autumn and release in mid-winter, our results suggested delays in the onset and release of endodormancy, providing time for buds to develop before endodormancy onset. Decreased respiration rates and starch concentrations in twigs and buds coincided with the endodormancy period. These were accompanied by high concentrations of glucose and fructose, suggesting changes in the respiratory mechanism, and occurrence of starch to sugar conversion. Increased WC in twigs at endodormancy onset was speculated as a response to the environment, related to endodormancy regulation and/or freezing tolerance. A prominent phenomenon in buds was the elevated RWC irrespective of hydration at endodormancy onset, suggesting a decline in water holding capacity. DOI: 10.1080/13416979.2024.2435282 Scopus
- Win Aung, Yuka Watanabe and Fumio Hashinaga2014 · 記述言語: 英語 掲載種別: 研究論文(学術雑誌)
- Hidetaka Umata, Yuko Ota. Masayoshi Yamada, Yuka Watanabe and Stephan W. Gale2013 · 記述言語: 英語 掲載種別: 研究論文(学術雑誌)
- 山本 雅史, 桑原 佳大, 窪田 瑛水, 島田 温史, 吉﨑 由美子, 渡部 由香, 朴 炳宰, 香西 直子 . 鹿児島県大隅半島南部の特産香酸カンキツである辺塚ダイダイの類縁関係と果実特性 . 熱帯農業研究17 ( 1 ) 1 - 11記述言語: 日本語 出版者・発行元: 日本熱帯農業学会 <p>鹿児島県大隅半島南部の特産香酸カンキツである辺塚ダイダイの遺伝的特性および果実品質を調査した.CAPS(cleaved amplified polymorphic sequence)分析の結果,辺塚ダイダイはブンタン由来の細胞質を備え,カブス(ダイダイ),紅甘夏(ナツミカン)およびキミカンと近縁であった.供試した辺塚ダイダイ4種類では核および葉緑体のCAPS遺伝子型に差異が認められなかった.4か年間にわたり果実品質を調査したところ,利用盛期の9月下旬から10月頃には,果皮に緑色が残り,滴定酸度は約4%であった.果実重は成熟に伴い増加を続け,10月下旬で約100 gであった.有機酸組成ではクエン酸の割合が約97%であった.アスコルビン酸含量は19.2~28.0 mg・100 mL<sup>-1</sup>であった.香気成分ではリモネンが最も多く81.2%であった.γテルピネンの9.8%,βミルセンの2.6%,αピネンの1.4%,<i>p</i>-シメンの1.2%,サビネンの1.1%がそれに続いた.辺塚ダイダイに特徴的な香気成分は認められなかった.香気の官能評価でも辺塚ダイダイに特徴的な項目は確認できなかった.これらのことから,辺塚ダイダイは一つの特徴的な香気があるのではなく,香りのバランスが他の香酸カンキツと異なることで,特徴的な香りを形成していることが示唆された.</p> DOI: 10.11248/nettai.17.1 CiNii Research
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