| Project/Area Number |
03404009
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
林学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SASAKI Satohiko Univ.Tokyo, Fac.Agric., Prof, 農学部, 教授 (20196158)
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| Co-Investigator(Kenkyū-buntansha) |
KOJIMA Katsumi Univ.Tokyo, Fac.Agric., Asst.Prof, 農学部, 助手 (80211895)
TANGE Takeshi Univ.Tokyo, Fac.Agric., Asst.Prof, 農学部, 助手 (20179922)
IDE Yuji Univ.Tokyo, Fac.Agric., Assoc.Prof, 農学部, 助教授 (90213024)
YAGI Hisayoshi Univ.Tokyo, Fac.Agric., Assoc.Prof, 農学部, 助教授 (80191089)
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| Project Period (FY) |
1991 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥28,200,000 (Direct Cost: ¥28,200,000)
Fiscal Year 1993: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 1992: ¥11,000,000 (Direct Cost: ¥11,000,000)
Fiscal Year 1991: ¥15,800,000 (Direct Cost: ¥15,800,000)
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| Keywords | Acid Sulfate Soil / Pyrite / Tropical Acacia Species / Aluminium Toxicity / Manganese Toxicity / Strong Soil Acidity / Tissue and Cell Culture System / Stress Tolerant Screening / Al過剰ストレス / Mn過剰ストレス / 硫酸酸性ストレス / プロトプラスト / 組織・細胞培養系 / 鉱物風化 / 酸性土壌耐性 / Mn過剰障害 / クロロシス / シラカンバ |
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| Research Abstract |
In this study, we have clarified the distribution of acid sulfate soils generated not only from Quaternary sediments but also from sedimentary rocks of the Tertiary in Japan. We also found Tertiary rocks containing pyrite (FeS_2), which generates sulfuric acid by oxidation, in East Kalimantan, Indonesia and Narathiwat, Thailand. Acid sulfate soil will be generated from the the pyrite-containing rocks by land development in tropic countries where now only the problem of acid sulfate soils generated from Quaternary sediments is pointed out. Elution of manganese from acid sulfate soils and disorder of planted trees by manganese toxicity were appeared by construction of high way in Ibaraki Prefecture, Japan. In order to plant trees on such acid sulfate soils, the trees is necessary to have tolerant ability to excessive manganese as well as to low pH.In the case of birch tree, which adapts on acidic soils, photosynthetic machinery was damaged by excess manganese. We showed that the tropical leguminous trees, Acacia mangium and Acacia auriculiformis, are adaptable to high manganese and low pH conditions. It suggests that the acacia trees are candidates for reforestation materials of degraded land with strong acidity. We have established the tissue culture system of Acacia mangium and Acacia auriculiformis for tolerant breeding. Using cell culture system of Acacia mangium, we clarified the response of the cells to low pH and excess manganese. Tolerant cell lines have been obtained by continuous culture under low pH and high manganese conditions. We are aiming to clarify the mechanism of tolerance to those stresses and to add tolerant ability to trees for reforestation of degraded land.
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