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Registro Completo |
Biblioteca(s): |
Embrapa Cerrados; Embrapa Trigo. |
Data corrente: |
18/12/1995 |
Data da última atualização: |
22/10/1999 |
Autoria: |
PIETA FILHO, C. |
Título: |
Cereal seed development and seed quality. |
Ano de publicação: |
1991 |
Fonte/Imprenta: |
Reading: University of Reading, 1991. |
Páginas: |
205p. |
Idioma: |
Inglês |
Notas: |
Ph.D. Thesis. |
Conteúdo: |
In order to determine when maximum seed quality was attained, changes in quality were monitored during seed development in spring and winter cereals in 1988 and 1989. Seed longevity was determined at 40oC with 15%-+ 0.5% moisture content for seed samples harvested serially fron developing seed crops of: two spring wheat cultivars and two spring barley cultivars in 1988; two winter wheat cultivars and two winter barley cultivars in 1989; and in one spring barley cultivar subjected to post-anthesis shading in both years. A seed storage regime was selected from the results of an initial laboratory experiment; subsequent comparisons with field emergence and standard laboratory germination showed that longevity was the most senstive indicator of changes in seed quality. Shading developing barley seeds: reduced seed dry weight substantially in both years; had little effect on seed longevity; but reduced seedliing size. Physiological maturity, defined as the stage in development when seeds attain maximum dry weight, ocurred before maximum seed quality was achieved in every case. Maximum seed quality generally occurred between 10 and 20 days after physiological maturity, when maturation drying had reduced seed moisture contents to between 14% and 28%; i. e. the timing of maximum seed quality was achieved closer to harvest maturity (16% moisture content) than to physiological maturity. Consequently, the hypothesis that maximum seed quality coincides with phsiological maturity and declines thereafter, is rejected. Cereal seed producers, in order to ensure high quality seeds, are recommended to harvest seeds, 1) In a wet season, when seed miosture content has fallen to around 20%, and then to dry artificially. 2) In a dry season, harvest seeds at or less than 16% moisture content.I suggest that similar invetigatons are carried out to determine when maximum seed quality occurs in other crop seeds. MenosIn order to determine when maximum seed quality was attained, changes in quality were monitored during seed development in spring and winter cereals in 1988 and 1989. Seed longevity was determined at 40oC with 15%-+ 0.5% moisture content for seed samples harvested serially fron developing seed crops of: two spring wheat cultivars and two spring barley cultivars in 1988; two winter wheat cultivars and two winter barley cultivars in 1989; and in one spring barley cultivar subjected to post-anthesis shading in both years. A seed storage regime was selected from the results of an initial laboratory experiment; subsequent comparisons with field emergence and standard laboratory germination showed that longevity was the most senstive indicator of changes in seed quality. Shading developing barley seeds: reduced seed dry weight substantially in both years; had little effect on seed longevity; but reduced seedliing size. Physiological maturity, defined as the stage in development when seeds attain maximum dry weight, ocurred before maximum seed quality was achieved in every case. Maximum seed quality generally occurred between 10 and 20 days after physiological maturity, when maturation drying had reduced seed moisture contents to between 14% and 28%; i. e. the timing of maximum seed quality was achieved closer to harvest maturity (16% moisture content) than to physiological maturity. Consequently, the hypothesis that maximum seed quality coincides with phsiological maturity and dec... Mostrar Tudo |
Palavras-Chave: |
Cereals; Fisiologia teor de umidade; Longividade; Maturity; Moisture content; Quality; Seed; Seed lingevity; Seed longevity. |
Thesagro: |
Cereal; Fisiologia; Longevidade; Maturidade; Qualidade; Semente; Teor de Umidade. |
Thesaurus Nal: |
humidity; plant physiology. |
Categoria do assunto: |
-- |
Marc: |
LEADER 02757nam a2200349 a 4500 001 1559241 005 1999-10-22 008 1991 bl uuuu m 00u1 u #d 100 1 $aPIETA FILHO, C. 245 $aCereal seed development and seed quality. 260 $aReading: University of Reading$c1991 300 $a205p. 500 $aPh.D. Thesis. 520 $aIn order to determine when maximum seed quality was attained, changes in quality were monitored during seed development in spring and winter cereals in 1988 and 1989. Seed longevity was determined at 40oC with 15%-+ 0.5% moisture content for seed samples harvested serially fron developing seed crops of: two spring wheat cultivars and two spring barley cultivars in 1988; two winter wheat cultivars and two winter barley cultivars in 1989; and in one spring barley cultivar subjected to post-anthesis shading in both years. A seed storage regime was selected from the results of an initial laboratory experiment; subsequent comparisons with field emergence and standard laboratory germination showed that longevity was the most senstive indicator of changes in seed quality. Shading developing barley seeds: reduced seed dry weight substantially in both years; had little effect on seed longevity; but reduced seedliing size. Physiological maturity, defined as the stage in development when seeds attain maximum dry weight, ocurred before maximum seed quality was achieved in every case. Maximum seed quality generally occurred between 10 and 20 days after physiological maturity, when maturation drying had reduced seed moisture contents to between 14% and 28%; i. e. the timing of maximum seed quality was achieved closer to harvest maturity (16% moisture content) than to physiological maturity. Consequently, the hypothesis that maximum seed quality coincides with phsiological maturity and declines thereafter, is rejected. Cereal seed producers, in order to ensure high quality seeds, are recommended to harvest seeds, 1) In a wet season, when seed miosture content has fallen to around 20%, and then to dry artificially. 2) In a dry season, harvest seeds at or less than 16% moisture content.I suggest that similar invetigatons are carried out to determine when maximum seed quality occurs in other crop seeds. 650 $ahumidity 650 $aplant physiology 650 $aCereal 650 $aFisiologia 650 $aLongevidade 650 $aMaturidade 650 $aQualidade 650 $aSemente 650 $aTeor de Umidade 653 $aCereals 653 $aFisiologia teor de umidade 653 $aLongividade 653 $aMaturity 653 $aMoisture content 653 $aQuality 653 $aSeed 653 $aSeed lingevity 653 $aSeed longevity
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
Biblioteca(s): |
Embrapa Roraima. |
Data corrente: |
06/03/2018 |
Data da última atualização: |
16/04/2018 |
Tipo da produção científica: |
Folder/Folheto/Cartilha |
Autoria: |
DURIGAN, M. F. B. |
Afiliação: |
MARIA FERNANDA BERLINGIERI DURIGAN, CPAF-Roraima. |
Título: |
Pós-colheita e Agroindústria: Geleia Artesanal de Cupuaçu. |
Ano de publicação: |
2017 |
Fonte/Imprenta: |
Boa Vista, RR: Embrapa Roraima, 2017. |
Série: |
(Embrapa Roraima. Folder, 21). |
Idioma: |
Português |
Thesagro: |
Cupuaçu; Pós-Colheita; Theobroma Grandiflorum. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/175474/1/correcao1-FOLDER-21.pdf
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Marc: |
LEADER 00428nam a2200145 a 4500 001 2088646 005 2018-04-16 008 2017 bl uuuu u0uu1 u #d 100 1 $aDURIGAN, M. F. B. 245 $aPós-colheita e Agroindústria$bGeleia Artesanal de Cupuaçu. 260 $aBoa Vista, RR: Embrapa Roraima$c2017 490 $a(Embrapa Roraima. Folder, 21). 650 $aCupuaçu 650 $aPós-Colheita 650 $aTheobroma Grandiflorum
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Embrapa Roraima (CPAF-RR) |
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