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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
11/02/2003 |
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Data da última atualização: |
25/08/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
ARAÚJO, M. R. A. de; COULMAN, B. E. |
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Afiliação: |
CNPC; GRICULTURE AND AGRI-FOOD CANADA, SASKATOON RESEARCH CENTRE, AGRICULTURE AND AGRI-FOOD CANADA, SASKATOON RESEARCH CENTRE. |
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Título: |
Genetic variation, heritability and progeny testing in meadow bromegrass. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Plant Breeding, v. 121, n. 5, p. 417-424, Oct. 2002. |
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DOI: |
10.1046/j.1439-0523.2002.739124.x |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract - Meadow bromegrass is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. Because 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 half-sib (polycross and open-pollinated) and full-sib (selfed) progenies were evaluated for dry matter and seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fibre and acid detergent fibre. Genetic variation for seed yield, harvest index, and plant height was significant in the open-pollinated and selfed tests. Genetic variation estimates for dry matter yield were negative (polycross), not significant (open-pollinated), or significant (selfed). Estimates of genetic variation for quality traits were not significant, except for acid detergent fibre (selfed). Correlations among characters indicated that it is possible to simultaneously improve seed and forage yield. Rankings of progenies by the half-sib tests for forage and seed yield were not altered by the use of the synthetic parental value (SVi), which includes information from selfed progeny. The polycross progeny test did not discriminate parents as well as the open-pollinated and selfed tests; this may have been a result of non-random pollination in the polycross. Correlation among the progeny tests, showed that open-pollinated and selfed progeny tests agreed for all characters, except for harvest index, while correlation between polycross and selfed tests were significant for six characters but not dry matter yield, and acid and neutral detergent fibres. The most dissimilar tests were polycross and open-pollinated, with significant correlations found only for fertility index, height, spread and neutral detergent fibre. It was concluded that there was significant variation and moderate heritability for most traits in the meadow bromegrass populations evaluated, and that the open-pollinated progeny test is the method of choice for selecting parents for synthetics of this species. MenosAbstract - Meadow bromegrass is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. Because 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 half-sib (polycross and open-pollinated) and full-sib (selfed) progenies were evaluated for dry matter and seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fibre and acid detergent fibre. Genetic variation for seed yield, harvest index, and plant height was significant in the open-pollinated and selfed tests. Genetic variation estimates for dry matter yield were negative (polycross), not significant (open-pollinated), or significant (selfed). Estimates of genetic variation for quality traits were not significant, except for acid detergent fibre (selfed). Correlations among characters indicated that it is possible to simultaneously improve seed and forage yield. Rankings of progenies by the half-sib tests for forage and seed yield were not altered by the use of the synthetic parental value (SVi), which includes information from selfed progeny. The polycross progeny test did not discriminate parents as well as the open-pollinated and selfed tests; this may have been a ... Mostrar Tudo |
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Palavras-Chave: |
Herdabilidade. |
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Thesagro: |
Festuca Arundinacea; Genética Vegetal; Lolium Perenne; Melhoramento Genético Vegetal; Teste de Progênie; Variação Genética. |
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Thesaurus Nal: |
Bromus riparius; Forage yield; Genetic variation; Heritability; Plant genetics; Progeny testing; Seed yield. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 03207naa a2200313 a 4500
001 1528986
005 2023-08-25
008 2002 bl uuuu u00u1 u #d
024 7 $a10.1046/j.1439-0523.2002.739124.x$2DOI
100 1 $aARAÚJO, M. R. A. de
245 $aGenetic variation, heritability and progeny testing in meadow bromegrass.$h[electronic resource]
260 $c2002
520 $aAbstract - Meadow bromegrass is a recently introduced pasture grass in western Canada. Its leafy production and rapid regrowth have made it a major grass species for pasturing beef animals in this region. Because 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 half-sib (polycross and open-pollinated) and full-sib (selfed) progenies were evaluated for dry matter and seed yield, fertility index, harvest index, plant height, plant spread, crude protein, neutral detergent fibre and acid detergent fibre. Genetic variation for seed yield, harvest index, and plant height was significant in the open-pollinated and selfed tests. Genetic variation estimates for dry matter yield were negative (polycross), not significant (open-pollinated), or significant (selfed). Estimates of genetic variation for quality traits were not significant, except for acid detergent fibre (selfed). Correlations among characters indicated that it is possible to simultaneously improve seed and forage yield. Rankings of progenies by the half-sib tests for forage and seed yield were not altered by the use of the synthetic parental value (SVi), which includes information from selfed progeny. The polycross progeny test did not discriminate parents as well as the open-pollinated and selfed tests; this may have been a result of non-random pollination in the polycross. Correlation among the progeny tests, showed that open-pollinated and selfed progeny tests agreed for all characters, except for harvest index, while correlation between polycross and selfed tests were significant for six characters but not dry matter yield, and acid and neutral detergent fibres. The most dissimilar tests were polycross and open-pollinated, with significant correlations found only for fertility index, height, spread and neutral detergent fibre. It was concluded that there was significant variation and moderate heritability for most traits in the meadow bromegrass populations evaluated, and that the open-pollinated progeny test is the method of choice for selecting parents for synthetics of this species.
650 $aBromus riparius
650 $aForage yield
650 $aGenetic variation
650 $aHeritability
650 $aPlant genetics
650 $aProgeny testing
650 $aSeed yield
650 $aFestuca Arundinacea
650 $aGenética Vegetal
650 $aLolium Perenne
650 $aMelhoramento Genético Vegetal
650 $aTeste de Progênie
650 $aVariação Genética
653 $aHerdabilidade
700 1 $aCOULMAN, B. E.
773 $tPlant Breeding$gv. 121, n. 5, p. 417-424, Oct. 2002.
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| 20. |  | ALVES, J. U.; BARROS, N. N.; ARAÚJO, M. R. A. de. Desempenho ponderal e mortalidade de cabritas de raças leiteiras, na fase de recria, em regime de pastagem nativa, submetidas a três níveis de suplementação concentrada. In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 28., 1991, João Pessoa. Anais... João Pessoa: Sociedade Brasileira de Zootecnia, 1991. p. 478.| Tipo: Resumo em Anais de Congresso |
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