| Project/Area Number |
06660016
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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 |
作物学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
NAKAMOTO Tomomi The University of Tokyo, Department of Agriculture, Associate Professor, 農学部, 助教授 (50180419)
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| Project Period (FY) |
1994 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
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| Keywords | Gravitropism / Negative reaction / Seminal root / Maize / Wheat / 根 / イネ科 |
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| Research Abstract |
The seminal root of cereal plants is known to grow plagiogravitropic. The objectives of this project were to describe the details of the plagiogravitropism of the seminal roots of maize (Zea mays L.) and wheat (Triticum aestivum L.) and to study the effects of several environmental and internal factors on the plagiogravitropism with the intention of clarifying its mechanisms.
1.The seminal root, showing plagiogravitropism, grew in a different direction from the plumb line both under field conditions and under laboratory conditons. It showed a negative gravitropic reaction before it showed a positive one. This growth movement was considered to play a major role in plagiogravitropic growth.
2.The effects of temperature and water potential of the surrounding soil, both of which were major environmental factors, on the growth of maize seminal root were studied. Higher temperatures reduced the initial negative gravitropic reaction. Low soil water potential induced a downward growth at root emergence. It is suggested through applying a mathematical model, that higher temperatures and/or low water potential accelerated the diminution of the initial negative gravitroppic reaction.
3.Dry conditions affected the gravitropic reaction of wheat seminal roots and induced a downward growth. The excision of the primary seminal root reduced the negative gravitropic reaction of the first pair of seminal roots. And it also induced an increase in the diameter of the root tip. It was suggested that the gravitropism of wheat seminal roots was under the control of internal factors, such as the distribution of assimilates.
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