| Project/Area Number |
05640703
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
生態
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| Research Institution | Hirosaki University |
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Principal Investigator |
SAWADA Shin-ichi Hirosaki Univ., Fac., Sci.Professor, 理学部, 教授 (70106839)
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| Co-Investigator(Kenkyū-buntansha) |
KASAI Minobu Hirosaki Univ., Fac., Sci.Asso.Prof., 理学部, 助教授 (10221871)
ARAKAWA Osamu Hirosaki Univ., Fac., Agr.Asso.Prof., 農学部, 助教授 (70184265)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1995: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1994: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1993: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Keywords | Photosynthesis / Source / Sink Mechanism / Plant Density / Source Content / RuBP Content / RuBPcarboxylase Activity / 光合成速度 / sucrose含量 / 光合成 / source-sink機構 / 物質生産過程 / 群落状態 / RuBPCase活性 |
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| Research Abstract |
Soybean (Glycine max Merr.cv.Tsurunoko) plants were grown in the experimental field with high (20 plants/m^2) and law (1.6 plants/m^2) densitites. With progressing of their growth, high density plants were placed under deep mutual shading condition, although low density plants were continuously placed under independently indivitual conditions.
(1) Upper leaves on high density plants kept high photosynthetic activities from morning to after noon. Low density plants showed high photosynthetic activities before noon but largely lowered the activities after noon.
(2) Sucrose content in leaves of the low density plants was higher than in the high density plants.
(3) In the low density plants, the activity of RuBPcase lowered according to lowering of photosynthetic activity. This lowered activity was perfectly recovered with addition of CO_2 and Mg^<2+> into activation medium.
(4) The RuBP content in leaves of the lower density plants was significantly higher than in those of the high density plants.
It is concluded that the results obtained from the low density plants are consisitent with the those which were observed in the source-sink model plants made from soybean leaves when the source/sink balance was altered (Sawada et al., 1986,1987,1989,1990,1992,1995a, b).
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