The Nutrient Translocation of Seedlings with Chemical Analyses of the Xylem Saps of Cryptomeria japonica D. Don and Pinus densiflora Sieb. et Zucc.

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概要

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• The chemical compositions of xylem saps of Cryptomeria japonica D. Don and Pinus densiflora Sieb. et Zucc. were studied. One-year-old seedlings of these species were transplanted into hydroponics in the middle of June, Some seedlings were retained in the nursery. Two nitrogen sources, ammonium and nitrate nitrogen, were applied separately. The samplings of xylem saps were made at the end of July. Saps were collected from both roots and tops of the seedlings using a pressure chamber. In C. japonica, the fact that the translocation form of nitrogen from the roots to shoots mainly was citrulline was confirmed. The result of P. densiflora in this study showed that glutamine was the predominant compound of nitrogen translocation. Total nitrogen of P. densiflora had a large value in the series of ammonium. Glutamine increased in the ammonium series of both species. Nitrate nitrogen was found in whole samples of C. japonica, and was not found in P. densiflora. As the result of cations in the saps, monovalent cations were rich in P. densiflora, and divalent cation concentrations were greater in C. japonica. The idea that the great oxygen requirement of P. densiflora produces the negative charge gives an explanation of the great retention of divalent cations in the roots. The idea that the mineral distribution indicates root activity related to its negative charge production also is considered a possibility.

• 一般社団法人日本森林学会の論文
• 1996-02-16

著者

• AKAMA Akio

  Forestry and Forest Products Research Institute

• Akama A

  Forestry And Forest Products Research Institute

関連論文

• Growth, nitrogen fixation and mineral acquisition of Alnus sieboldiana after inoculation of Frankia together with Gigaspora margarita and Pseudomonas putida
• The Nutrient Translocation of Seedlings with Chemical Analyses of the Xylem Saps of Cryptomeria japonica D. Don and Pinus densiflora Sieb. et Zucc.

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