| Project/Area Number |
07556005
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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 | 試験 |
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| Research Field |
作物学
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| Research Institution | HOKKAIDO UNIVERSITY |
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Principal Investigator |
YAMAGUCHI Junichi Hokkaido Univ., Fac.of Agric., Assoc.Prof., 農学部, 助教授 (80001478)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Hajime Hokkaido Univ.of Educ., Sapporo, Crop Sci.Lab., Prof., 教育学部・札幌校, 教授 (20091530)
TAKAYANAGI Shigeru Hokkaido Univ.of Educ., Sapporo, Physics Dept.Prof., 教育学部・札幌校, 教授 (50013529)
IWAMA Kazuto Hokkaido Univ., Fac.of Agric., Assoc.Prof., 農学部, 助教授 (70144219)
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| Project Period (FY) |
1995 – 1996
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| Project Status |
Completed (Fiscal Year 1996)
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| Budget Amount *help |
¥7,600,000 (Direct Cost: ¥7,600,000)
Fiscal Year 1996: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1995: ¥4,800,000 (Direct Cost: ¥4,800,000)
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| Keywords | Surface Electric Potential / Crop / Water Stress / High Impedance / Field bean / Potato / Rice / Earth |
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| Research Abstract |
1) High impedance amplifier installed with a voltage follower circuit was developed for monitoring plant surface electric potential, together with a circuit accuracy tester.
2) Parallel and non-parallel contact methods of the amplifier to plant were tested, where the latter was easier to contact, but was likely to be affected the atmospheric noise. Eventually, the both methods gave a similar accuracy.
3) Field bean, potato and rice plants were grown in fields and in greenhouse, and various measurements were carried out using the device developed. Major results are : (i) The electric potential showed a diurnal change : an increase in day time and a decrease in night. The midday increase of field bean were larger in water stressed than in non-water stressed plants. (ii) The potential was higher at the lower than at the higher internodes in water stressed field bean, while the trend was reverse in the non-stressed plant. In potato, however, there were a great difference in the internode position. (iii) The variation of the potential at different stem positions was not in a simple manner, but the difference between positions was additeve. (iv) The potential at the upper internode decreased immediately after detaching the top at the order of several tenth mv, and then recovered gradually. (v) pH of the growing medium affected greatly to the potential. (vi) The potential was affected with the light condition, and its variation was likely to be induced with heat. (vii) Although the growing and atmospheric conditions were similar, there were a great variation of potentials among individual plants.
4) Developed devices were successful to monitor plant surface potential. Difference among individual plants was, however, large and the response to environmental conditions varied greatly in each measurement. Therefore, we have to find the cause of these phenomena in a further study.
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