Studies on the relation between weed distribution and environmental condition -- The relationship between reproduction mechanisms of lowland weeds and environmental condition-
| Project/Area Number |
59480030
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
作物
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| Research Institution | Institute for Agricultural and Biological Sciences, Okayama University |
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Principal Investigator |
NAKAGAWA Kyojiro Okayama University, Institute for Agricultural and Biological Sciences Professor, 農学研究所, 教授 (40033154)
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| Co-Investigator(Kenkyū-buntansha) |
OKI Yoko Okayama University, Institute for Agricultural and Biological Sciences Assistant, 農業生物研究所, 助手 (30127550)
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| Project Period (FY) |
1984 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1986: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1985: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1984: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Cyperaceae weed / Hydrilla / dormancy / germination / light germination alternating temperature / photoperiodism / 日長反応 / 植物ホルモン |
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| Research Abstract |
(1) The relation between reproduction mechanisms of weeds and environmental conditions were studied to clarify essential characteristics of weeds and to find out effective weed control methods.
(2) A apparatus for germination test under direct sunlight without temperature increase on seed beds was used. Light and alternating temperature stimulated seeds of Cyperus serotinus, C.iria and C. microiria into germination.
(3) Seeds of Cyperus iria and C. microiria were stored in different conditions. One month storage in every conditions was enough to increase germination percentages of C. iria. Germination percerntages of C.iria stored in the darkness at 5゜C and in submerged soil, were decreased after 4 months and gra dually increased after 6 months storage. Dormancy of C. microiria was deeper than C. iria.
(4) Germination percentages of C. microiria drastically lowered when they put in either of wet or soaking condition.
(5) Flower buds of C. iria and C. microiria were formated in shorter daylength than 13 hours.
(6) Almost of tubers and turions of two strains of Hydrilla verticillata germinated in the pretreatment of 25゜C darkness and in the succeeding treatment of 5゜C darkness, but in the case of other one strain each half of tubers and turions germinated by the second treatment of 5゜C darkness.
(7) Indole acetic acid (IAA) had no effect on tubers and turions of Hydrilla verticillata but their length and germination percentage increased with gibberellin( <GA_3> ) or low temperature(5゜C) treatments.
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Report
(1 results)
Research Products
(8 results)
