Absorption and translocation of nitrogen in cucumber (Cucumis sativus L.) plants using the ^<15>N tracer technique(Plant Nutrition)
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概要
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Cucumber (Cucumis sativus L.) plants were grown with hydroponics in a greenhouse and the absorption and translocation of nitrogen in the plants were investigated after the first fruit harvest using ^<15>N-labeled nitrogen. The ^<15>N-labeled nutrient solution, which contained 13mmol L^<-1> nitrate, was supplied for 7 days from first fruit harvest on 21 September, 2005. Following 7 days of ^<15>N treatment, these plants received the same composition of non-labeled nitrogen for 16 days (chase period). Commercial-sized fruits, approximately 20cm in length, were harvested every day. The whole plants were harvested three times at the beginning (21 September) and at the end (28 September) of the ^<15>N treatment period, and at the end of the chase period on 14 October. The average nitrogen absorption rate was 196mg plant^<-1> per day during the ^<15>N treatment period and 181mg plant^<-1> per day during the chase period. The labeled nitrogen was detected in the fruits within 1 day of the ^<15>N treatment, and the percentage of nitrogen from labeled nitrogen in the harvested fruits increased up to approximately 50% at the end of the ^<15>N treatment period. The percentage of labeled nitrogen in the fruits quickly decreased after changing from ^<15>N solution to the non-labeled conditions during the chase period. At the end of the ^<15>N treatment period on 28 September, the percentage distribution of labeled nitrogen was 46% in the leaves, 24% in the harvested fruits, 13% in the stems, 9% in the roots and 9% in the small fruits. After 16 days of chase period, the distribution of labeled nitrogen decreased in the leaves (33%), stems (6.5%), roots (3.6%) and small fruits (1%), but 56% of labeled nitrogen was distributed in the harvested fruits. Based on the result obtained, the nitrate absorbed from the medium is rapidly transported to young fruits as well as to leaves and stems. The nitrogen once assimilated or stored in the leaves, stems and roots is gradually redistributed to the fruits for supporting their rapid growth. To maximize the yield of cucumber fruits, it is necessary to supply sufficient levels of nitrogen continuously after the first harvest.
- 社団法人日本土壌肥料学会の論文
著者
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Sueyoshi Kuni
Graduate School Of Science And Technology ; Niigata University
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OHTAKE Norikuni
Graduate School of Science and Technology ; Niigata University
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OHYAMA Takuji
Graduate School of Science and Technology ; Niigata University
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Ohyama Takuji
Faculty of Agriculture, Niigata University
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Ohyama Takuji
Faculty Of Agriculture Niigata University
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OHTAKE Norikuni
Faculty of Agriculture, Niigata University
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SUEYOSHI Kuni
Faculty of Agriculture, Niigata University
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TANEMURA Ryota
Niigata Agricultural Research Institute, Horticultural Research Center
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KURASHIMA Hiroshi
Niigata Agricultural Research Institute, Horticultural Research Center
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Ohtake Norikuni
Dept. Appl. Biol. Chem. Fac. Agric. Niigata Univ.
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Sueyoshi Kuni
Department Of Agricultural Chemistry Faculty Of Horticulture Chiba University
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Sueyoshi Kuni
Department Of Applied Biological Chemistry Faculty Of Agriculture Niigata University
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Tanemura Ryota
Niigata Agricultural Research Institute Horticultural Research Center:graduate School Of Science And
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Ohyama T
Niigata Univ. Niigata Jpn
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Kurashima Hiroshi
Niigata Agricultural Research Institute Horticultural Research Center
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Tanemura Ryota
Niigata Agricultural Res. Inst. Niigata Jpn
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