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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados; Embrapa Trigo. |
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Data corrente: |
18/12/1995 |
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Data da última atualização: |
22/10/1999 |
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Autoria: |
PIETA FILHO, C. |
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Título: |
Cereal seed development and seed quality. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Reading: University of Reading, 1991. |
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Páginas: |
205p. |
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Idioma: |
Inglês |
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Notas: |
Ph.D. Thesis. |
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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 |
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Palavras-Chave: |
Cereals; Fisiologia teor de umidade; Longividade; Maturity; Moisture content; Quality; Seed; Seed lingevity; Seed longevity. |
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Thesagro: |
Cereal; Fisiologia; Longevidade; Maturidade; Qualidade; Semente; Teor de Umidade. |
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Thesaurus Nal: |
humidity; plant physiology. |
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Categoria do assunto: |
-- |
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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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Embrapa Cerrados (CPAC) |
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| 7. |  | RODRIGUES, G. S.; CAMPANHOLA, C.; KITAMURA, P. C.; IRIAS, L. J. M.; RODRIGUES, I. Sistema de avaliação de impacto social de atividades agropecuárias (APOIA-SOCIAL). Cadernos de Ciência & Tecnologia, Brasília, v.22, n.3, p.691-711, 2005.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: Nacional - A |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| Registros recuperados : 12 | |
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