Environmental Response and Acclimation of Dark-Respiration in Crop Plants
| Project/Area Number |
17580017
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Crop science/Weed science
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| Research Institution | Okayama University |
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Principal Investigator |
SAITOH Kuniyuki Okayama University, GRADUATE SCHOOL OF NATURAL SCIENCE AND TECHNOLOGY, PROFESSOR (60153798)
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| Co-Investigator(Kenkyū-buntansha) |
KURODA Toshiro OKAYAMA UNIVERSITY, GRADUATE SCHOOL OF NATURAL SCIENCE AND TECHNOLOGY, PROFESSOR (10032301)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,750,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥150,000)
Fiscal Year 2007: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2006: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2005: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Dark-respiration / Growth efficiency / Dry-matter production / Difference among crop species / Vegetative organ / Reproductive organ / Nitrogen content / Oil content / シトクロム呼吸経路 / シアン耐性呼吸経路 / 老化 / 葉身窒素合量 / 枯葉 / 吸水による呼吸上昇 / 作物種 / 維持呼吸 / 成長呼吸 / タンパク質含量 / 粗脂肪含量 |
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| Research Abstract |
Dark-respiration is a physiological process which supplies essential energy for growth and maintenance in crop plants. It is necessary to clarify the relationship between dark-respiration and dry-matter production quantitatively. Ten crop species were cultivated in the upland or paddy field, and the growth parameters (CGR ; crop growth rate, NAR ; net assimilation rate and LAI ; mean leaf area index) and the dark-respiration rates were measured during the whole growth season. CGR in each crop stands increased with the growth, and showed the maximum at the beginning of reproductive period followed by the gradual decrease until the physiological maturity. Specific respiration rate (Rs) of whole plant showed the maximum at the earlier stage of the vegetative growth, and rapidly decreased until the beginning of reproductive period, after that almost constant during the ripening period. Rs in the vegetative organs (leaf blade and stem) changed almost same tendency with that in the whole pla
… More
nt, and Rs in the leaf blade was higher than that in the stem during the reproductive period. Rs in the sink organ (panicle, pod and flower, etc.) showed the maximum at the earlier seed growth period followed by the rapid decrease, and was similar value or lower than that in the vegetative organ at the physiological maturity. Nitrogen content in the sink organ was highest at the beginning of seed growth followed by rapid decrease, and re-increased at the later ripening period in sunflower, soybean, kenaf and groundnut, of which seed contained much protein. Growth efficiency (GE=CGR/ (CGR+Rp), Rp ; per plant respiration rate) in the whole plant during the vegetative period was more than 60% in corn, sunflower, kenaf and barley, and lower in potato, soybean and groundnut showing 39-55% due to the higher Rp. GE in the whole plant during the reproductive period was smaller than that during the vegetative period (except potato) related to the increase in the maintenance respiration of nonassimilative organ and the decrease in the thy-weight of vegetative organs due to translocation of assimirates. Close correlation was found between the GE in the sink organ, which occupied larger portion of the phytomass at the later stage of ripening period, and the oil content of reserve material in the sink organ indicating that the cost of respiration used for oil synthesis was larger than the other substances. It was speculated that the variation in GE among crop species was due to the differences in the cost of growth and maintenance respiration of vegetative organs and of synthesis used for the reserve substances. Less
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Report
(4 results)
Research Products
(10 results)
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[Presentation] 10種作物の器官別成長効率の比較2006
Author(s)
齊藤邦行・村上倫啓
Organizer
日本作物学会第253回講演会
Place of Presentation
茨城大学農学部
Year and Date
2006-03-30
Description
「研究成果報告書概要(和文)」より
Related Report
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