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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
06/09/2001 |
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Data da última atualização: |
31/10/2019 |
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Autoria: |
ARAUJO, M. R. A. de. |
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Afiliação: |
MARCELO RENATO ALVES DE ARAUJO, CNPC. |
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Título: |
Variation and heritability in meadow bromegrass (Bromus riparius Rehm.). |
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Ano de publicação: |
2001 |
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Fonte/Imprenta: |
2001. |
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Páginas: |
157p. |
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Idioma: |
Inglês |
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Notas: |
Thesis (Doctor of Philosophy) - University of Saskatchewan, Saskatoon, Canada. |
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Conteúdo: |
Meadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it the most widely used grass species for pasturing beef animals in this region. As relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate genetic parameters and assess breeding methodologies for meadow bromegrass. Forty-four meadow bromegrass genotypes from the three available cultivars and forty half-sib (polycross (PX) and open-pollinated (OP)) and selfed (S1) progenies were evaluated for morphological and agronomic characters, and molecular (RAPD) markers. Genetic variation for total biological yield, head weight, seed yield, harvest index, height, growth habit, spread, and volume was significant in the OP and S1 tests. Genetic variation estimates for dry matter yield were negative (PX), not significant (OP), or moderate (S1). Estimated geneticvariation for quality traits and those characters which were visually evaluated was not significant, except for growth habit (OP and S1) and acid-detergent fiber (ADF) (S1). Among progeny lines, RAPD marker variation found in the half-sib progenies accounted for about 15% of the total variation. In the S1 test the variation among progeny lines was twice that of the half-sib progenies. Correlations between the different characters demonstrated that is possible to simultaneously improve both seed and forage yield. Since leafiness was found to be correlated with dry matter yield but not with seed yield it may be possible to simultaneously improve all three characters. Rankings of progenies by the half-sib tests for forage and seed yield were not changed by the use of the synthetic parental value (SVi) which includes information from selfed progeny. The PX progeny test did not discriminate parents as well as the OP and S1 tests, which may be due to non-random pollination in the polycross. The S1 progeny test showed the highest predicted response to selection, followed by the OP test. Heritability estimates from the OP and S1 tests for total biological yield, seed yield, harvest index, and height, were similar to those found in the clonal evaluation test. Therefore, a clonal evaluation test will provide sufficient information to choose parents for breeding an improved synthetic cultivar for these characters. Observed dissimilarity of ranking of progeny lines over progeny tests for some traits (head weight, seed yield, and harvest index) was due to discrepancies between the PX and OP tests. No differences in progeny line ranking among the progeny tests were observed for all other traits. Analysis of variance on marker frequency means showed that interaction between genotypes and progeny lines was also not significant. MenosMeadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it the most widely used grass species for pasturing beef animals in this region. As relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate genetic parameters and assess breeding methodologies for meadow bromegrass. Forty-four meadow bromegrass genotypes from the three available cultivars and forty half-sib (polycross (PX) and open-pollinated (OP)) and selfed (S1) progenies were evaluated for morphological and agronomic characters, and molecular (RAPD) markers. Genetic variation for total biological yield, head weight, seed yield, harvest index, height, growth habit, spread, and volume was significant in the OP and S1 tests. Genetic variation estimates for dry matter yield were negative (PX), not significant (OP), or moderate (S1). Estimated geneticvariation for quality traits and those characters which were visually evaluated was not significant, except for growth habit (OP and S1) and acid-detergent fiber (ADF) (S1). Among progeny lines, RAPD marker variation found in the half-sib progenies accounted for about 15% of the total variation. In the S1 test the variation among progeny lines was twice that of the half-sib progenies. Correlations between the different characters demonstrated that is possible to simultaneous... Mostrar Tudo |
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Palavras-Chave: |
Genetic parameters; Genetica quantitativa. |
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Thesagro: |
Genética Molecular; Marcador Molecular; Pastagem. |
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Thesaurus Nal: |
Bromus riparius; Forage grasses; Grasses; Pasture plants. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 03559nam a2200241 a 4500
001 1516291
005 2019-10-31
008 2001 bl uuuu m 00u1 u #d
100 1 $aARAUJO, M. R. A. de
245 $aVariation and heritability in meadow bromegrass (Bromus riparius Rehm.).
260 $a2001.$c2001
300 $a157p.
500 $aThesis (Doctor of Philosophy) - University of Saskatchewan, Saskatoon, Canada.
520 $aMeadow bromegrass (Bromus riparius Rehm.) is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it the most widely used grass species for pasturing beef animals in this region. As relatively little breeding work has been done on this species, there is little information on its breeding behaviour. The main objective of this study was to estimate genetic parameters and assess breeding methodologies for meadow bromegrass. Forty-four meadow bromegrass genotypes from the three available cultivars and forty half-sib (polycross (PX) and open-pollinated (OP)) and selfed (S1) progenies were evaluated for morphological and agronomic characters, and molecular (RAPD) markers. Genetic variation for total biological yield, head weight, seed yield, harvest index, height, growth habit, spread, and volume was significant in the OP and S1 tests. Genetic variation estimates for dry matter yield were negative (PX), not significant (OP), or moderate (S1). Estimated geneticvariation for quality traits and those characters which were visually evaluated was not significant, except for growth habit (OP and S1) and acid-detergent fiber (ADF) (S1). Among progeny lines, RAPD marker variation found in the half-sib progenies accounted for about 15% of the total variation. In the S1 test the variation among progeny lines was twice that of the half-sib progenies. Correlations between the different characters demonstrated that is possible to simultaneously improve both seed and forage yield. Since leafiness was found to be correlated with dry matter yield but not with seed yield it may be possible to simultaneously improve all three characters. Rankings of progenies by the half-sib tests for forage and seed yield were not changed by the use of the synthetic parental value (SVi) which includes information from selfed progeny. The PX progeny test did not discriminate parents as well as the OP and S1 tests, which may be due to non-random pollination in the polycross. The S1 progeny test showed the highest predicted response to selection, followed by the OP test. Heritability estimates from the OP and S1 tests for total biological yield, seed yield, harvest index, and height, were similar to those found in the clonal evaluation test. Therefore, a clonal evaluation test will provide sufficient information to choose parents for breeding an improved synthetic cultivar for these characters. Observed dissimilarity of ranking of progeny lines over progeny tests for some traits (head weight, seed yield, and harvest index) was due to discrepancies between the PX and OP tests. No differences in progeny line ranking among the progeny tests were observed for all other traits. Analysis of variance on marker frequency means showed that interaction between genotypes and progeny lines was also not significant.
650 $aBromus riparius
650 $aForage grasses
650 $aGrasses
650 $aPasture plants
650 $aGenética Molecular
650 $aMarcador Molecular
650 $aPastagem
653 $aGenetic parameters
653 $aGenetica quantitativa
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Soja. Para informações adicionais entre em contato com valeria.cardoso@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
17/08/2012 |
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Data da última atualização: |
17/08/2012 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
MENDES, F. L.; ANTONIO, S. F.; DEBIASI, H.; FRANCHINI, J. C.; DIAS, W. P.; RAMOS JUNIOR, E. U.; SILVA, J. F. V. |
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Afiliação: |
PIBIC - CNPq; PIBIC - CNPq; HENRIQUE DEBIASI, CNPSO; JULIO CEZAR FRANCHINI DOS SANTOS, CNPSO; WALDIR PEREIRA DIAS, CNPSO; EDISON ULISSES RAMOS JUNIOR, CNPSO; JOAO FLAVIO VELOSO SILVA, CPAMT. |
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Título: |
Manejo cultural do nematoide das lesões radiculares durante a entressafra da soja no Mato Grosso. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE SOJA, 6., 2012, Cuiabá. Soja: integração nacional e desenvolvimento sustentável: resumos. Brasília, DF: Embrapa, 2012. p. 92, res. 147. |
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Idioma: |
Português |
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Conteúdo: |
Com o objetivo de avaliar os efeitos do manejo do solo na entressafra sobre a população e danos de Pratylenchus brachyurus em soja, foi implantado um experimento em área naturalmente infestada, localizada em Vera/MT. Os tratamentos foram: alqueive mecânico (gradagem); Crotalaria ochroleuca; C. juncea; C. spectabilis; C. spectabilis + milheto ADR 300; pousio; milheto ADR 300; alqueive químico (herbicidas); Brachiaria ruziziensis; milho GNZ 2005 + B. ruziziensis; milho GNZ 2005; e B. brizantha Marandu. A população do nematoide nas raízes da soja, semeada na sequência, foi avaliada aos 45 e aos 90 dias após a semeadura (DAS). Na primeira época, o número de nematoides foi significativamente menor para os tratamentos alqueive mecânico, C. ochroleca, C. spectabilis, C. juncea e C. spectabilis + milheto ?ADR 300? e maior naqueles cultivados na entressafra com milho + B. ruziziensis, milho solteiro ou com B. brizantha Marandu. Na segunda avaliação, os tratamentos milho + B. ruziziensis e B. ruziziensis resultaram em populações maiores que os demais. A produtividade da soja correlacionou-se negativamente com o número de nematoides aos 45 DAS, o que não se repetiu para a população aos 90 DAS. Assim, práticas de manejo que reduzam a população inicial de P. brachyurus são importantes para diminuir os danos do nematoide à soja. |
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Thesagro: |
Nematóide. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02067naa a2200205 a 4500
001 1931494
005 2012-08-17
008 2012 bl uuuu u00u1 u #d
100 1 $aMENDES, F. L.
245 $aManejo cultural do nematoide das lesões radiculares durante a entressafra da soja no Mato Grosso.
260 $c2012
520 $aCom o objetivo de avaliar os efeitos do manejo do solo na entressafra sobre a população e danos de Pratylenchus brachyurus em soja, foi implantado um experimento em área naturalmente infestada, localizada em Vera/MT. Os tratamentos foram: alqueive mecânico (gradagem); Crotalaria ochroleuca; C. juncea; C. spectabilis; C. spectabilis + milheto ADR 300; pousio; milheto ADR 300; alqueive químico (herbicidas); Brachiaria ruziziensis; milho GNZ 2005 + B. ruziziensis; milho GNZ 2005; e B. brizantha Marandu. A população do nematoide nas raízes da soja, semeada na sequência, foi avaliada aos 45 e aos 90 dias após a semeadura (DAS). Na primeira época, o número de nematoides foi significativamente menor para os tratamentos alqueive mecânico, C. ochroleca, C. spectabilis, C. juncea e C. spectabilis + milheto ?ADR 300? e maior naqueles cultivados na entressafra com milho + B. ruziziensis, milho solteiro ou com B. brizantha Marandu. Na segunda avaliação, os tratamentos milho + B. ruziziensis e B. ruziziensis resultaram em populações maiores que os demais. A produtividade da soja correlacionou-se negativamente com o número de nematoides aos 45 DAS, o que não se repetiu para a população aos 90 DAS. Assim, práticas de manejo que reduzam a população inicial de P. brachyurus são importantes para diminuir os danos do nematoide à soja.
650 $aNematóide
700 1 $aANTONIO, S. F.
700 1 $aDEBIASI, H.
700 1 $aFRANCHINI, J. C.
700 1 $aDIAS, W. P.
700 1 $aRAMOS JUNIOR, E. U.
700 1 $aSILVA, J. F. V.
773 $tIn: CONGRESSO BRASILEIRO DE SOJA, 6., 2012, Cuiabá. Soja: integração nacional e desenvolvimento sustentável: resumos. Brasília, DF: Embrapa, 2012. p. 92, res. 147.
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