ALLEVIATION EFFECT OF ARGININE ON ARTIFICIALLY REDUCED GRAIN YIELD OF NH_4^+-OR NO_3^--FED RICE

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概要

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• This study deals with the effect of arginine on the growth and grain yield of rice plants which had been exposed to artificially induced adverse conditions, such as shading or low temperature of the culture solution. Rice plants were water-cultured in a solution containing NH_4^+, NO_3^-, Arg, or Arg with NH_4^+ or NO_3^-. The experiments were conducted for 4 years from 1977 to 1980. Climatic conditions varied from unfavorable, favorable, favorable and unfavorable, in series, for the growth and grain yield of rice, respectively. The results can be summarized as follows. 1) Under natural conditions, when the climatic conditions were favorable, plants given NH_4^+ or Arg showed the highest grain yield (1978-1979). In the plants receiving Arg combined with NO_3^- tillering was promoted and the number of reproductive ears was increased compared with the plants receiving only NO_3^-. Addition of Arg to NH_4^+ often failed to promote yield and sometimes depressed it, compared with the effect of NH_4^+ alone, presumably due to mutual shading associated with overtillering (1978). In the NO_3^--plants grain yield was always lower than in the NH_4^+-plants mainly due to the smaller number of ears associated with depressed tillering (1977, 1978 and 1979). 2) Under adverse conditions artificially induced, the grain yields of NH_4^+- and NO_3^--plants were decreased except in the case of the NO_3^--plants in 1978. In general, the shading treatment led to a lower grain yield in the NO_3^--plants than in the NH_4^+-plants and low temperature treatment of the culture solution led to a lower grain yield in the NH_4^+-plants than in the NO_3^--plants. However, each year, Arg combined with NH_4^+ or NO_3^- always led to partial recovery of the grain yield. Recovery reached the control level when the climatic conditions were favorable (1978 and 1979). Even when the climatic conditions were unfavorable (1977 and 1980), values of yield recovery amounted to more than half of the control level.

• 社団法人日本土壌肥料学会の論文

著者

• MORI Satoshi

  Laboratory of Plant Biotechnology, Graduate School of Agricultural and Life Sciences, The University

• Mori Satoshi

  Laboratory Of Piant Molecular Physiology Department Of Applied Biological Chemistry The University O

• Mori Satoshi

  Laboratory Of Plant Nutrition And Fertilizer The University Of Tokyo

• Nishikawa Akira

  Laboratory Of Plant Nutrition And Fertilizer The University Of Tokyo

• Uchino H

  Laboratory Of Plant Nutrition And Fertilizer The University Of Tokyo

• UCHlNO Hiroshi

  Laboratory of Plant Nutrition and Fertilizer, The University of Tokyo

• SAGO Fumihisa

  Laboratory of Plant Nutrition and Fertilizer, The University of Tokyo

• SUZUKI Satoru

  Laboratory of Plant Nutrition and Fertilizer, The University of Tokyo

• Sago Fumihisa

  Laboratory Of Plant Nutrition And Fertilizer The University Of Tokyo

• Uchlno Hiroshi

  Laboratory Of Plant Nutrition And Fertilizer The University Of Tokyo

• Suzuki Satoru

  Laboratory Of Plant Nutrition And Fertilizer The University Of Tokyo

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