2002 Fiscal Year Final Research Report Summary
Dynamics and regulation of partitioning and utilization of photoassimilates in crop plants.
| Project/Area Number |
12460009
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
作物学
|
|---|
| Research Institution | Nagoya University |
|---|
Principal Investigator |
TATSUMI Jiro Nagoya University, Graduate School of Bioagricultural Sciences, Professor, 大学院・生命農学研究科, 教授 (00163486)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
YAMAUCHI Akira Nagoya University, Graduate School of Bioagricultural Sciences, Professor, 大学院・生命農学研究科, 教授 (30230303)
|
|---|
| Project Period (FY) |
2000 – 2002
|
| Keywords | partitioning / sink / rhizosphere / morphology / isotope tracer / 13C / 15N |
|---|
| Research Abstract |
The growth and function of developing sinks and roots of tomato, rice, Pinellia ternata and legume crops were investigated with reference to shoot-root relationship. The dynamics of carbon and nitrogen in rice tillers were also investigated. In tomato plants morphology, respiration and nitrogen uptake rate were characteristically different between the roots grown in nutrient solution and atmospheric air with drip irrigation. The roots grown in air showed large sink activity of photoassimilates and higher stress tolerance to high temperature. In Pinellia which has two sinks, corms and bulbils, partitioning of 13C assimilates between these organs was changed reciprocally with the light conditions. In rice plants considerable amount of carbon and nitrogen labeled with 13C and 15N once incorporated in non-productive tillers were retranslocated to productive tillers after heading. The pH gradient of rhizosphere was investigated along seminal root axis of legumes. In cowpea mid portion of rhizospehere along seminal axis was locally acidified under the shoot light conditions. The restriction of photosynthesis of leaves with treatments of photosynthesis inhibitor or reduce leaf area resulted in disappearance of local acidification. It was assumed that rhizosphere acidification was due to the proton efflux from root, and the activity of proton pump was controlled by shoot light conditions.
|
