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Registro Completo |
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Biblioteca(s): |
Embrapa Florestas. |
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Data corrente: |
10/08/1993 |
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Data da última atualização: |
22/04/2025 |
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Autoria: |
SQUILLACE, A. E.; BINGHAM, R. T.; NANKOONG, G.; ROBINSON, H. F. |
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Título: |
Heritability of juvenile growth rate and expected gain from selection in western white pine. |
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Ano de publicação: |
1967 |
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Fonte/Imprenta: |
Silvae Genetica, v. 16, p. 1-6, 1967. |
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Idioma: |
Inglês |
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Conteúdo: |
Estimates of heritability are valuable aids in planning tree improvement programs that involve selection. Probably their most important use is in predicting the amount of genetic improvement that might be attained unlder various breeding schemes. Such knowledge of expected gains helps in choosing the best approach and also suggests how much money can justifiably be spent in attaining them. Heritability estimates likewise help the tree breeder in judging the relative amount of effort he should expend on each of the traits he is seeking to improve. Finally, they provide insight into such questions as, "How many trees should be selecteld and progeny tested, and how intensive should each phase of the program be?" This paper reports heritability estimates that were madc for juvenile growth rate in western white pine (Pinus monticoba DOUGL.) by analysis of variance of progenies anrl by parent-progeny regressions. In relying upon juvenile rates of growth, one assumes that relative rates of growth for (different genotypes do not vary greatly with age. Atdmittedly, usefulness of juvenile growth rates has limitations because patterns of growth rate change as trees mature. However, we feel that estimates presented herein do have merit when used with ldue precaution. The estimates of heritability putblished herein are "narrow sense" estimates (LUSH, 1940); t'hat is, only the additive component of genetic variance is considered. |
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Palavras-Chave: |
Herdabilidade; Pine. |
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Thesagro: |
Seleção; Taxa de Crescimento. |
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Thesaurus Nal: |
Pinus monticola. |
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Categoria do assunto: |
K Ciência Florestal e Produtos de Origem Vegetal |
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Marc: |
null
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Registro original: |
Embrapa Florestas (CNPF) |
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