Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea)
High level of seed dormancy in fresh harvested seeds of S. macrocephala and S. capitata was observed. Several treatments were tested in order to increasing seed germination (loss of dormancy). In the physical methods, the seeds were heated to 60oC for 150 minutes and 4oC for 10 and 14 days. The chem...
| Main Authors: | , , |
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| Format: | Journal Article |
| Language: | Portugués |
| Published: |
1986
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10568/44403 |
| _version_ | 1855522720038518784 |
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| author | Carmona, R Ferguson, John E. Souza Maia, M. de |
| author_browse | Carmona, R Ferguson, John E. Souza Maia, M. de |
| author_facet | Carmona, R Ferguson, John E. Souza Maia, M. de |
| author_sort | Carmona, R |
| collection | Repository of Agricultural Research Outputs (CGSpace) |
| description | High level of seed dormancy in fresh harvested seeds of S. macrocephala and S. capitata was observed. Several treatments were tested in order to increasing seed germination (loss of dormancy). In the physical methods, the seeds were heated to 60oC for 150 minutes and 4oC for 10 and 14 days. The chemical treatments consisted of soaking the seeds in sulphuric acid (98.08%) for 10, 15 and 20 minutes. The scarification and seed cut in the pod were used as a mechanical treatment. The higher germination was obtained with scarification of the seeds. Scarified seeds were also tested in the presence of KNO3 (0.2%), GA3 (500ppm) and thiourea (0.5 and 1,0%). The most effective treatment for germination and tetrazolium test was thiourea. GA3 containing thiourea increased germination in S. capitata however the seedling growth was affected and the seed pathogens were reduced. Based on this result, the thiourea is suitable for these two species although the concentration needs more studies. |
| format | Journal Article |
| id | CGSpace44403 |
| institution | CGIAR Consortium |
| language | Portugués |
| publishDate | 1986 |
| publishDateRange | 1986 |
| publishDateSort | 1986 |
| record_format | dspace |
| spelling | CGSpace444032025-05-15T09:40:26Z Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) Carmona, R Ferguson, John E. Souza Maia, M. de feed crops stylosanthes macrocephala stylosanthes capitata semillas latencia germinacion tratamiento de semillas escarificacion calidad de las semillas desarrollo de la planta estadios del desarrollo fisiología vegetal leguminosas materiales de propagación producción de semillas stylosanthes High level of seed dormancy in fresh harvested seeds of S. macrocephala and S. capitata was observed. Several treatments were tested in order to increasing seed germination (loss of dormancy). In the physical methods, the seeds were heated to 60oC for 150 minutes and 4oC for 10 and 14 days. The chemical treatments consisted of soaking the seeds in sulphuric acid (98.08%) for 10, 15 and 20 minutes. The scarification and seed cut in the pod were used as a mechanical treatment. The higher germination was obtained with scarification of the seeds. Scarified seeds were also tested in the presence of KNO3 (0.2%), GA3 (500ppm) and thiourea (0.5 and 1,0%). The most effective treatment for germination and tetrazolium test was thiourea. GA3 containing thiourea increased germination in S. capitata however the seedling growth was affected and the seed pathogens were reduced. Based on this result, the thiourea is suitable for these two species although the concentration needs more studies. Constatou-se elevado grau de dormência em sementes recém-colhidas de S. macrocephala e S. capitata. Testaram-se alguns tratamentos visando o incremento de germinação para testes de qualidade de sementes. lnicialmente, testaram-se métodos físicos, químicos e mecânicos na germinação de sementes com vagem. Nos tratamentos físicos, as sementes foram submetidas a 60 o C por 150 minutos, e 4 o C durante dez e quatorze dias. Os químicos constaram de imersão de sementes em ácido sulfúrico (98,08%) durante 10, 15 e 20 minutos. Os mecânicos foram: corte de sementes com vagem, e remoção de vagens com posterior lixamento das sementes. Os maiores incrementos na germinação foram obtidos através da escarificação das sementes com lixa. A partir de sementes lixadas, testaram-se os efeitos de tratamentos térmicos e químicos na germinação. Os tratamentos térmicos foram os mesmos já citados, e os químicos foram: nitrato de potássio 0,2%, ácido giberélico 500ppm e tiouréia (0,5 e 1,0%). Para as sementes escarificadas, os únicos tratamentos efetivos na germinação foram os que incluíram tiouréia, obtendo-se resultados semelhantes entre germinação e viabilidade em tetrazólio. O ácido gíberélico adicionado à tiouréia aumentou a germinação em S. capitata. Recomenda-se o uso de tiouréia para testes de germinação em sementes lixadas, das duas espécies. Necessita-se, entretanto, de mais estudos relativos à concentração. 1986 2014-10-02T08:33:44Z 2014-10-02T08:33:44Z Journal Article https://hdl.handle.net/10568/44403 pt Open Access |
| spellingShingle | feed crops stylosanthes macrocephala stylosanthes capitata semillas latencia germinacion tratamiento de semillas escarificacion calidad de las semillas desarrollo de la planta estadios del desarrollo fisiología vegetal leguminosas materiales de propagación producción de semillas stylosanthes Carmona, R Ferguson, John E. Souza Maia, M. de Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) |
| title | Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) |
| title_full | Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) |
| title_fullStr | Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) |
| title_full_unstemmed | Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) |
| title_short | Germinacao de sementes em (Stylosanthes macrocephala M.B. Ferr. et Sousa Costa E.S. capitata vog. in Linnaea) |
| title_sort | germinacao de sementes em stylosanthes macrocephala m b ferr et sousa costa e s capitata vog in linnaea |
| topic | feed crops stylosanthes macrocephala stylosanthes capitata semillas latencia germinacion tratamiento de semillas escarificacion calidad de las semillas desarrollo de la planta estadios del desarrollo fisiología vegetal leguminosas materiales de propagación producción de semillas stylosanthes |
| url | https://hdl.handle.net/10568/44403 |
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