1996 Fiscal Year Final Research Report Summary
Plant response and tolerance mechanism to ionic stress in rhizosphere.
| Project/Area Number |
07306020
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 総合 |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Okayama University |
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Principal Investigator |
MATSUMOTO Hideaki Res.Inst.for Bioresources, Okayama Univ., Professor, 資源生物科学研究所, 教授 (80026418)
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| Co-Investigator(Kenkyū-buntansha) |
KONISHI Shigeki Shizuoka Univ., Fac.Agriculture, Professor, 農学部, 教授 (70026417)
CHINO Mitsuo Tokyo Univ., Fac.Agriculture, Professor, 農学部, 教授 (10007677)
WAGATSUMA Tadao Yamagata Univ., Fac.Agriculture, Professor, 農学部, 教授 (70007079)
MORI Satoshi Tokyo Univ., Fac.Agriculture, Professor, 農学生命科学研究科, 教授 (90011915)
TADANO Toshiaki Hokkaido Univ., Fac.Agriculture, Professor, 農学部, 教授 (40001440)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Ionic stress / Response / Tolerance acquisition / Aluminum / Phosphate deficiency / Iron deficiency / Heavy metal / Rhizosphere |
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| Research Abstract |
In the root of wheat subjected to Al stress, the inhibition of cell elongation occurred faster than that of cell division. The inhibition of cell elongation induced the decrease of the length and increase of the diameter of cell. Marked deposition of lignin was observed in the inhibited cell in elongation zone. In tea, Al repressed the Mn toxicity by reducing the transport of Mn. The interelationship between exclusion of organic acids and Al tolerance was investigated. The order of effective repression of Al toxicity by organic acids was citrate > malate > succinate.
As to the tolerance mechanism to phosphate starvation, carrot cells selected under phosphate starvation showed a stronger activity of citric acid synthetase than that of wild one. On the other hand, the activity of citrate consuming enzyme, NADP- ICDP was lower in the selected cells.
Rupin roots excluded a large amount of acid phosphatase. The molecular analysis of acid phosphatase showed that M.W.was 72 KDa. Furthermore, cDNA encoding the excluded acid phosphatase consisted of 2207 bases.
Cucumber plant excreted riboflavin under phosphate starvation. There was positive relaitonship between the amount of riboflavin exclusion and Fe^<3+> reducing activity but its coexistence stimulated the Fe^<3+> reducing activity.
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