2006 Fiscal Year Final Research Report Summary
Moleculargenetic investigation on silica uptake in rice
| Project/Area Number |
15380007
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Breeding science
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| Research Institution | Kagawa University |
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Principal Investigator |
ICHII Masahiko Kagawa University, President, 学長 (50036076)
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| Co-Investigator(Kenkyū-buntansha) |
TAKETA Shin Kagawa University, Faculty of Agriculture, Professor, 農学部, 教授 (40216891)
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| Project Period (FY) |
2003 – 2006
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| Keywords | rice / silicon / gene / disease resistance / insect resistance |
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| Research Abstract |
A mutant with low Si uptake was induced by chemical mutagen treatment. We named the mutant GR1, because it was selected based on the resistance against germanium (Ge), an analogue of silicon (Si) with harmful effect on plants. Molecular mapping showed that the causal gene for low silicon uptake in GR1 was located on the long arm of rice chromosome 2.We determined Si content in the mutant and the wild type by chemical analysis and found that the mutant showed a range of 11-43% of Si content of the wild type in different plant organs studied. Interestingly, the mutant showed an increased level of lignin compared to the wild type; we ascribed this elevated lignin content to "compensation effect" which tends to retain firmness of the plant body. GR1 was more susceptible blast disease and insect attacks. There was no remarkable difference in plant mass productivity upon cultivation in a field, but digestibility of the whole-crop-silage by cows was similar between the mutant and wild type. Thus, the reduced level of Si in the mutant did not result in improvement in digestibility by cows. To know the root parts that contribute to Si uptake, we analyzed various rice root mutants defective in lateral roots or root hairs. Our analysis showed that Si was mainly absorbed through lateral roots and that root hairs did not show significant contribution to Si uptake in rice.
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Research Products
(19 results)
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[Journal Article] Defects in root development and gravity response in the aem1 mutant of rice are associated with reduced auxin-efflux2005
Author(s)
Debi, B.R., Chhun, T., Taketa, S., Tsurumi, S., Xia, K., Miyao, A., Hirochika, H., Ichii, M.
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Journal Title
Journal of Plant Physiology 162
Pages: 678-685
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Defects in root development and gravity response in the aem1 mutant of rice are associated with reduced auxin-efflux.2005
Author(s)
Debi, B.R., Chhun, T., Taketa, S., Tsurumi, S., Xia, K., Miyao, A., Hirochika, H., Ichii, M.
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Journal Title
Journal of Plant Physiology 162
Pages: 678-685
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Isolation and characterization of a short lateral root mutant in rice (Oryza sativa L.).2003
Author(s)
Debi, B.R., Mushika, J., Taketa, S., Miyao, A., Hirochika, H., Ichii, M.
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Journal Title
Plant Science 165
Pages: 895-903
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Lateral root formation in rice (Oryza sativa L.) : differential effects of indole-3-acetic acid and indole-3-butyric acid.2003
Author(s)
Wang, S-C., Taketa, S., Ichii, M., Xu, L., Xia, K., Zhou, X.
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Journal Title
Plant Growth Regulation 41
Pages: 41-47
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Lateral root formation in rice (Oryza sativa L.) : differential effects of indole-3-acetic acid and indole-3-butyric acid.2003
Author(s)
Wang, S-C.Taketa, S., Ichii, M., Xu, L., Xia, K., Zhou, X.
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Journal Title
Plant Growth Regulation 41
Pages: 41-47
Description
「研究成果報告書概要(欧文)」より
