| Project/Area Number |
08454259
|
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| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
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| Section | 一般 |
|---|
| Research Field |
植物生理
|
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| Research Institution | Kyoto Prefectural University |
|---|
Principal Investigator |
TAKEBA Go Human Environment, Kyoto Prefectural University Professor, 人間環境学部, 教授 (10046500)
|
|---|
| Project Period (FY) |
1996 – 1997
|
| Project Status |
Completed (Fiscal Year 1997)
|
| Budget Amount *help |
¥7,900,000 (Direct Cost: ¥7,900,000)
Fiscal Year 1997: ¥2,500,000 (Direct Cost: ¥2,500,000)
Fiscal Year 1996: ¥5,400,000 (Direct Cost: ¥5,400,000)
|
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| Keywords | photosynthesis / photorespiration / glutamine synthetase / photodamage / photoinhibition / photooxidation / C3回路 / CO_2 / Rubisco / 活性酸素 |
|---|
| Research Abstract |
Plants absorb light for photosynthesis but as light can itself be dangerous to plants, they need to protect themselves against its damaging effects. Here, we show that photorespiration can act as such a defence mechanism. We constructed transgenic tobacco plants enriched or reduced in plastidic glutamine synthetase (GS2), a key enzyme in photorespiration. Those transgenic plants having twice the normal amount of GS2 had an improved capacity for photorespiration and an increased tolerance to high-intensity light, whereas those with a reduced amount of GS2 gad a diminished capacity for photorespiration and were photoinhibited more severely by hight-intensity light compasred with control plants. We conclude that photorespiration protects C3 plants from photoinhibition.
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