Dormancy, germination and emergence of Urochloa panicoides regulated by temperature
Urochloa panicoides is an annual weed of summer crops. In Argentina, in subhumid areas with monsoon rainfall, it germinates and establishes in a single flush. To (i) identify the environmental factors that modify its seed dormancy level and germination and (ii) quantify the parameters describing the...
| Main Authors: | , , , |
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| Format: | Artículo |
| Language: | Inglés |
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Wiley; European Weed Research Society
2019
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| Online Access: | http://hdl.handle.net/20.500.12123/4825 https://onlinelibrary.wiley.com/doi/full/10.1111/wre.12181 https://doi.org/10.1111/wre.12181 |
| _version_ | 1855483504101425152 |
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| author | Ustarroz, Diego Kruk, Betina Claudia Satorre, Emilio Horacio Ghersa, Claudio Marco |
| author_browse | Ghersa, Claudio Marco Kruk, Betina Claudia Satorre, Emilio Horacio Ustarroz, Diego |
| author_facet | Ustarroz, Diego Kruk, Betina Claudia Satorre, Emilio Horacio Ghersa, Claudio Marco |
| author_sort | Ustarroz, Diego |
| collection | INTA Digital |
| description | Urochloa panicoides is an annual weed of summer crops. In Argentina, in subhumid areas with monsoon rainfall, it germinates and establishes in a single flush. To (i) identify the environmental factors that modify its seed dormancy level and germination and (ii) quantify the parameters describing the thermal behaviour of the germination and emergence dynamics of this weed under non‐limiting water conditions, we established a set of germination experiments performed (i) under controlled conditions using seeds after ripened for 3 or 6 months in different thermal and hydric conditions and (ii) under field conditions, where the soil temperature was modified by applying different shading levels. Seed dormancy level remained high with 3 months after ripening in all treatments. After 6 months, seeds stored at 4°C in dry conditions did not germinate at any temperature, while seeds stored at 25°C in dry conditions and in situ germinated c. 20% and 60% respectively. Germination percentage was higher in seeds harvested before their natural dispersal. The base, optimum and maximum temperatures for seed germination were 6, 35 and 45°C respectively. Shading reduced the number of emerged seedlings, possibly by reducing the soil thermal amplitude. The results explained the dormancy‐breaking mechanism of U. panicoides that allows a high germination rate in the field when rainfall occurs. |
| format | Artículo |
| id | INTA4825 |
| institution | Instituto Nacional de Tecnología Agropecuaria (INTA -Argentina) |
| language | Inglés |
| publishDate | 2019 |
| publishDateRange | 2019 |
| publishDateSort | 2019 |
| publisher | Wiley; European Weed Research Society |
| publisherStr | Wiley; European Weed Research Society |
| record_format | dspace |
| spelling | INTA48252019-04-05T13:02:19Z Dormancy, germination and emergence of Urochloa panicoides regulated by temperature Ustarroz, Diego Kruk, Betina Claudia Satorre, Emilio Horacio Ghersa, Claudio Marco Dormición Germinación Emergencia Temperatura Dormancy Germination Emergence Temperature Grass Weed Malezas Urochloa Panicoides After-ripening Condition Urochloa panicoides is an annual weed of summer crops. In Argentina, in subhumid areas with monsoon rainfall, it germinates and establishes in a single flush. To (i) identify the environmental factors that modify its seed dormancy level and germination and (ii) quantify the parameters describing the thermal behaviour of the germination and emergence dynamics of this weed under non‐limiting water conditions, we established a set of germination experiments performed (i) under controlled conditions using seeds after ripened for 3 or 6 months in different thermal and hydric conditions and (ii) under field conditions, where the soil temperature was modified by applying different shading levels. Seed dormancy level remained high with 3 months after ripening in all treatments. After 6 months, seeds stored at 4°C in dry conditions did not germinate at any temperature, while seeds stored at 25°C in dry conditions and in situ germinated c. 20% and 60% respectively. Germination percentage was higher in seeds harvested before their natural dispersal. The base, optimum and maximum temperatures for seed germination were 6, 35 and 45°C respectively. Shading reduced the number of emerged seedlings, possibly by reducing the soil thermal amplitude. The results explained the dormancy‐breaking mechanism of U. panicoides that allows a high germination rate in the field when rainfall occurs. EEA Manfredi Fil: Ustarroz, Diego. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Manfredi; Argentina Fil: Kruk, Betina Claudia. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cerealicultura; Argentina Fil: Satorre, Emilio Horacio. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Cerealicultura; Argentina Fil: Ghersa, Claudio Marco. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura; Argentina 2019-04-05T12:49:35Z 2019-04-05T12:49:35Z 2016-02 info:ar-repo/semantics/artículo info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://hdl.handle.net/20.500.12123/4825 https://onlinelibrary.wiley.com/doi/full/10.1111/wre.12181 1365-3180 (Online) https://doi.org/10.1111/wre.12181 eng info:eu-repo/semantics/restrictedAccess application/pdf Wiley; European Weed Research Society Weed research 56 (1) : 59-68. (February 2016) |
| spellingShingle | Dormición Germinación Emergencia Temperatura Dormancy Germination Emergence Temperature Grass Weed Malezas Urochloa Panicoides After-ripening Condition Ustarroz, Diego Kruk, Betina Claudia Satorre, Emilio Horacio Ghersa, Claudio Marco Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
| title | Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
| title_full | Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
| title_fullStr | Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
| title_full_unstemmed | Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
| title_short | Dormancy, germination and emergence of Urochloa panicoides regulated by temperature |
| title_sort | dormancy germination and emergence of urochloa panicoides regulated by temperature |
| topic | Dormición Germinación Emergencia Temperatura Dormancy Germination Emergence Temperature Grass Weed Malezas Urochloa Panicoides After-ripening Condition |
| url | http://hdl.handle.net/20.500.12123/4825 https://onlinelibrary.wiley.com/doi/full/10.1111/wre.12181 https://doi.org/10.1111/wre.12181 |
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