Site of Nitrogen Accumulation in Tulip (Tulipa gesneriana L.) Roots during Winter (Plant Nutrition)
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概要
- 論文の詳細を見る
It was found that tulip (Tulipa gesneriana L.) plants accumulate a large amount of nitrogen in their roots during the winter season, which is efficiently used for rapid shoot growth after sprouting in spring. In the present paper, the site and origin of nitrogen accumulation in tulip roots were investigated in a vertical split-root experiment. Tulip roots were separated into upper and lower half parts in a two-compartment tray, and the culture solution was separately supplied for a week. Culture solution with N-free medium or that containing ^<15>N-labeled nitrate (2 mM ^<15>NO3^-_3 + 0.5 mM NH^+_4) or ^<15>N-labeled ammonium (2 mM NO3^-_3 + 0.5 mM ^<15>NH^+_4) was supplied to individual trays to determine the metabolic fate of nitrate and ammonium nitrogen in either part of the roots. The results indicated that nitrate and ammonium absorption activities were similar between the lower and upper half-parts of the tulip roots. The absorbed 15N predominantly accumulated either in the upper or lower part of the roots in direct contact with 15N-labeled medium, and only a small portion of ^<15>N was translocated to the other part. In the root part treated with ^<15>N-labeled medium, most of the absorbed nitrogen was in ethanol soluble forms, and free glutamine and glutamic acid were intensely labeled with ^<15>N. Also in the root parts directly in contact with nitrogen, the glutamine concentration in either the upper or the lower roots was considerably enhanced. On the other hand, nitrogen application did not affect the 4-methyleneglutamine concentration. Sucrose and glucose were the major soluble sugars in tulip roots, and the concentration was reduced at the nitrogen absorption site, possibly due to energy and carbon consumption for the absorption and assimilation of nitrogen.
- 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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Ikarashi Taro
Faculty of Agriculture, Niigata University
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Ikarashi Taro
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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RUAMRUNGSRI Soraya
Department of Horticulture, faculty of Agriculture, Chiang Mai University
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KOMIYAMA Satoshi
Graduate School of Science and Technology Niigata University
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TANABE Setsuko
Faculty of Agriculture, Niigata University
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MURAYAMA Akinobu
Graduate School of Science and Technology Niigata University
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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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Komiyama Satoshi
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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Tanabe Setsuko
Faculty Of Agriculture Niigata University
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Ikarashi T
Faculty Of Agriculture Niigata University
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Sueyoshi Kuni
Department Of Applied Biological Chemistry Faculty Of Agriculture Niigata University
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Ruamrungsri Soraya
Department Of Horticulture Faculty Of Agriculture Chiang Mai University:h.m. The King's Initiat
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