Mechanism of thermo-responses of a rice plant for panicle initiation and temperature sensing locations
| Project/Area Number |
17380153
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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 | 一般 |
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| Research Field |
Agricultural environmental engineering
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| Research Institution | National Agricultural Research Organization |
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Principal Investigator |
OKADA Masumi National Agricultural Research Organization, National Agricultural Research Center for Tohoku Region, Climate Change Research Team, Team leader (10355274)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Kikukatsu Iwate University, Faculty of Agriculture, Professor (50232434)
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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 |
¥15,290,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2007: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2006: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2005: ¥7,500,000 (Direct Cost: ¥7,500,000)
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| Keywords | rice / development / panicle initiatio / photo-periodic response / thermo-response / basal vegetative growth / 基本栄養生長性 / 感光性 |
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| Research Abstract |
The objectives of the present study are to understand the mechanism of thermo-responses of a rice plant for panicle initiation and finally to contribute toward evaluating developmental responses under global changes and fluctuating climate conditions. We observed changes of panicle initiation stage under controlled day length, air temperature and flood water temperature and found the way how temperatures affected rice panicle initiation.
1. Leaf development was determined by water temperature alone up to the 10th leaf stage and was affected neither by day length nor by air temperature.
2. Neither day length nor air temperature affected panicle initiation before the 7th leaf age stage. This suggested that a flowering signal receptor appeared at a growing apex around the 7th leaf age stage. A basal vegetative growth phase before the expression the signal receptor was, thus, determined by water temperature ; namely growing point temperature.
3. Short day conditions below a critical day length initiated a panicle immediately as soon as the receptor was activated. Air temperature did not affect this process.
4. Under long day conditions a panicle was not initiated soon after the 7th leaf age stage, but higher air temperature tended to promote panicle initiation. Air temperature induced panicle initiation in many of cultivars even under 24h day length after a sufficiently long time of a period.
5. Air temperature, therefore, did not affect panicle initiation under short day length, but did under long day length.
6. Leaf blade was suggested to be a temperature sensing position, while influence of leaf sheath temperature was negligible.
7. In case of a usual cropping time for cv. Akitakomachi in northern Tohoku region, the effect of water temperature on days from emergence to panicle initiation was evaluated as 4.3 day/℃ and the effect of air temperature as 1.5 day/℃. The former effect was thus three times as large as the latter one.
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Report
(4 results)
Research Products
(31 results)
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[Journal Article] Functional coexpression of the mitochondrial alternative oxidase and uncoupling protein underlies thermoregulation in the thermogenic florets of skunk cabbage.2008
Author(s)
Y.Onda, Y.Kato, Y.Abe, T.Ito, M.Morohashi, Y.Ito, M.Ichikawa, K.Matsukawa, Y.Kakizaki, H.Koiwa, K.Ito
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Journal Title
Plant Physiology 146
Pages: 636-645
Related Report
Peer Reviewed
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[Presentation] イネ穂分化の気温・日長応答2007
Author(s)
長菅輝義
Organizer
日本作物学会第223回講演会
Place of Presentation
茨城大学
Year and Date
2007-03-29
Description
「研究成果報告書概要(和文)」より
Related Report
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