|
|
Registro Completo |
Biblioteca(s): |
Embrapa Pantanal. |
Data corrente: |
25/11/2005 |
Data da última atualização: |
04/07/2018 |
Autoria: |
JORGE, M. H. A. |
Afiliação: |
MARCAL HENRIQUE AMICI JORGE, CNPH. |
Título: |
Germination and characterization of guayule (Parthenium argentatum Gray) seed. |
Ano de publicação: |
2005 |
Fonte/Imprenta: |
2005. |
Páginas: |
120 p. |
Idioma: |
Português |
Notas: |
Dissertação Doutorado. -- University of Arizona. |
Conteúdo: |
Guayule (Parthenium argentatum Gray) is a natural rubber producing plant presently being commercialized for production in arid and semi-arid regions of the world. Inconsistent seed (achenes) quality and the lack of methods to discriminate between good and bad seed lots are significant problems, allowing commercial stands to be established only by transplants, reather than by more cost effective direct-seeding. The objective of this study was to investigate why guayule seed and seed lots vary significantly in quality. The laboratory and greenhouse experiments involved separation of seed based on physical attributes (Diameter, color and weight) and the confirmation of internal structures (embryo and endosperm) by x-ray analysis. The effect of different conditioning treatments of seed lots was also tested. Separation of seed by size (diameter) was shown to be less efficient than separation by color. Color was the most effective means of separating heavier and darker (opaque-black and gray color grades) seed, and these seed were confirmed to be filled containing internal structures by x-ray analysis. Germination percentage and rate were greater for seed with these characteristics than for yellow and bright-black seed, which are lighter and predominately partially filled or unfilled. Conditioning treatments used for guayule seed older than two years had no effect on seed germination and emergence percentage or rate. However, differences in germination and emergence were found among lines, therefore, differences among seed lots appear to be due to variation in the number of filled seed. The quality of seed lots was significantly improved when seed were separated bases on color first, then by weight. The separation of good quality seed (filled) from poor quality seed (unfilled) is crucial to lower the costs of stand establishment by direct seeding. Therefore, the quality of seed lots can be improved significantly (higher proportion of filled seed) by separating first by color, then by weight. MenosGuayule (Parthenium argentatum Gray) is a natural rubber producing plant presently being commercialized for production in arid and semi-arid regions of the world. Inconsistent seed (achenes) quality and the lack of methods to discriminate between good and bad seed lots are significant problems, allowing commercial stands to be established only by transplants, reather than by more cost effective direct-seeding. The objective of this study was to investigate why guayule seed and seed lots vary significantly in quality. The laboratory and greenhouse experiments involved separation of seed based on physical attributes (Diameter, color and weight) and the confirmation of internal structures (embryo and endosperm) by x-ray analysis. The effect of different conditioning treatments of seed lots was also tested. Separation of seed by size (diameter) was shown to be less efficient than separation by color. Color was the most effective means of separating heavier and darker (opaque-black and gray color grades) seed, and these seed were confirmed to be filled containing internal structures by x-ray analysis. Germination percentage and rate were greater for seed with these characteristics than for yellow and bright-black seed, which are lighter and predominately partially filled or unfilled. Conditioning treatments used for guayule seed older than two years had no effect on seed germination and emergence percentage or rate. However, differences in germination and emergence were found amo... Mostrar Tudo |
Palavras-Chave: |
Caracterização; Characterization; Germiantion; Seed. |
Thesagro: |
Germinação; Parthenium Argentatum; Semente. |
Thesaurus Nal: |
guayule. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02634nam a2200229 a 4500 001 1811764 005 2018-07-04 008 2005 bl uuuu m 00u1 u #d 100 1 $aJORGE, M. H. A. 245 $aGermination and characterization of guayule (Parthenium argentatum Gray) seed. 260 $a2005.$c2005 300 $a120 p. 500 $aDissertação Doutorado. -- University of Arizona. 520 $aGuayule (Parthenium argentatum Gray) is a natural rubber producing plant presently being commercialized for production in arid and semi-arid regions of the world. Inconsistent seed (achenes) quality and the lack of methods to discriminate between good and bad seed lots are significant problems, allowing commercial stands to be established only by transplants, reather than by more cost effective direct-seeding. The objective of this study was to investigate why guayule seed and seed lots vary significantly in quality. The laboratory and greenhouse experiments involved separation of seed based on physical attributes (Diameter, color and weight) and the confirmation of internal structures (embryo and endosperm) by x-ray analysis. The effect of different conditioning treatments of seed lots was also tested. Separation of seed by size (diameter) was shown to be less efficient than separation by color. Color was the most effective means of separating heavier and darker (opaque-black and gray color grades) seed, and these seed were confirmed to be filled containing internal structures by x-ray analysis. Germination percentage and rate were greater for seed with these characteristics than for yellow and bright-black seed, which are lighter and predominately partially filled or unfilled. Conditioning treatments used for guayule seed older than two years had no effect on seed germination and emergence percentage or rate. However, differences in germination and emergence were found among lines, therefore, differences among seed lots appear to be due to variation in the number of filled seed. The quality of seed lots was significantly improved when seed were separated bases on color first, then by weight. The separation of good quality seed (filled) from poor quality seed (unfilled) is crucial to lower the costs of stand establishment by direct seeding. Therefore, the quality of seed lots can be improved significantly (higher proportion of filled seed) by separating first by color, then by weight. 650 $aguayule 650 $aGerminação 650 $aParthenium Argentatum 650 $aSemente 653 $aCaracterização 653 $aCharacterization 653 $aGermiantion 653 $aSeed
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Pantanal (CPAP) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
|
|
Registro Completo
Biblioteca(s): |
Embrapa Cerrados; Embrapa Recursos Genéticos e Biotecnologia. |
Data corrente: |
09/08/2019 |
Data da última atualização: |
04/11/2021 |
Tipo da produção científica: |
Autoria/Organização/Edição de Livros |
Autoria: |
FALEIRO, F. G.; OLIVEIRA, J. da S.; JUNQUEIRA, N. T. V.; SANTOS, R. S. dos (ed.). |
Afiliação: |
FABIO GELAPE FALEIRO, CPAC; Jamile da Silva Oliveira, Engenheira-agrônoma, doutora em Agronomia, bolsista da Embrapa Cerrados, Planaltina, DF; NILTON TADEU VILELA JUNQUEIRA, CPAC; RENATO SALES DOS SANTOS, Cenargen. |
Título: |
Banco de germoplasma de Passiflora L. 'Flor da Paixão' no portal Alelo recursos genéticos. |
Ano de publicação: |
2019 |
Fonte/Imprenta: |
Brasília, DF: Embrapa Recursos Genéticos e Biotecnologia, 2019. |
Páginas: |
88 p. |
Idioma: |
Português |
Palavras-Chave: |
Caracterização; Informação; Sistema. |
Thesagro: |
Conservação; Maracujá; Recurso Genético. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/206479/1/LIVRO-Banco-de-germoplasma-de-Passiflora.pdf
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/201049/1/Germoplasma-alelo2019.pdf
|
Marc: |
LEADER 00669nam a2200217 a 4500 001 2116348 005 2021-11-04 008 2019 bl uuuu 00u1 u #d 100 1 $aFALEIRO, F. G. 245 $aBanco de germoplasma de Passiflora L. 'Flor da Paixão' no portal Alelo recursos genéticos.$h[electronic resource] 260 $aBrasília, DF: Embrapa Recursos Genéticos e Biotecnologia$c2019 300 $a88 p. 650 $aConservação 650 $aMaracujá 650 $aRecurso Genético 653 $aCaracterização 653 $aInformação 653 $aSistema 700 1 $aOLIVEIRA, J. da S. 700 1 $aJUNQUEIRA, N. T. V. 700 1 $aSANTOS, R. S. dos
Download
Esconder MarcMostrar Marc Completo |
Registro original: |
Embrapa Cerrados (CPAC) |
|
Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
Fechar
|
Nenhum registro encontrado para a expressão de busca informada. |
|
|