1999 Fiscal Year Final Research Report Summary
Real time diagnosis of environmental stress by micromorphometric method
| Project/Area Number |
10556013
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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 | 展開研究 |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | Hiroshima University |
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Principal Investigator |
FUJITA Kounosyke Faculty of Applied Biological Science, Hiroshima University, Professor, 生物生産学部, 教授 (90002170)
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| Co-Investigator(Kenkyū-buntansha) |
LEE Keuki Yokkaichi University, Faculty of Biological resources, Professor, 生物資源学部, 教授 (00298663)
ITO Jinki Hiroshima Prefectural Agricultural Center, Researcher, 研究員
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| Project Period (FY) |
1998 – 1999
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| Keywords | Tomato / N deficiency / P deficiency / photosynthesis / translation / water relation / real time / strain gauge |
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| Research Abstract |
Tomato plant (Lycopersicon esculentum L. cv. Momotarou) were subjected to either N deficiency (withdrawal of nitrogen) or P deficiency (withdrawal of phosphorus) for about 20 days under water culture conditions. The effect of N or P deficiency on stem and fruit diameters were monitored, and simultaneously their effects on photosynthesis, photoassimilate translocation, and water relations were also measured.
P deficiency effect : (1) The apparent photosynthetic rate (Po) of leaves decreased at 12 days after treatment (DAT) by P deficiency treatment. (2) The stem diameter decreased at 6 DAT and the fruit diameter did at 9 DAT. (3) There was no significant effect of P deficiency on ィイD113ィエD1C partitioning.
N deficiency effect : (1) The stem diameter was affected at the first DAT with more intense shrinkage at daytime and slower recovery rate at night. (2) However, no significant effect was observed on fruit diameter. (3) Po decreased at 3 DAT, and (4) leaf water potential did at 7 DAT, under N deficiency. (5) At N deficient conditions, ィイD113ィエD1C export rate decreased remarkably.
These results suggest that deficiency of mineral elements such as N or P is possible to be detected and diagnosed at the earlier time by monitoring stem diameter than other parameters. In view of source-sink relationship, P deficiency impairs more severely sink activity of fruits than source activity, whereas N deficiency depresses source activity alone.
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