Data/hora: 02/06/2024 09:07:03

Biblioteca(s): | Embrapa Semiárido.
Tipo da produção científica: | Artigo em Periódico Indexado
Circulação/Nível: | Internacional - B
Data corrente: | 31/03/2000
Data da última atualização: | 16/10/2018
Autoria: | FERREIRA, M. A. J. F.; VENCOVSKY, R.; VIEIRA, M. L. C.; QUEIROZ, M. A. de.
Afiliação: | MARIA ALDETE JUSTINIANO F FERREIRA, CPATSA; MANOEL ABÍLIO DE QUEIROZ, CPATSA.
Título: | Outcrossing rate and implication for the improvement of a segregating population of watermelon.
Ano de publicação: | 2000
Fonte/Imprenta: | Acta Horticulturae, Leuven, n. 510, p. 47-54, 2000.
Idioma: | Inglês
Conteúdo: | This stady was aimed at estimating the natural outcrossing rate(t=1-s) of a partially andromonoecius segregating population (with 53.3% monoecious and 46.7% andromonoecious plants) of watermelon, the results being discussed from the perspective of the plant breeder. Twelve maternal families, each composed of 23 individuals plus the corresponding seed parents, were genotyped with RAPD markers. The MLDT (Multilocus Estimation of Outcrossing with Dominant Markers) procedure was used, considering a mixed mating system model. The following estimates were obtained with reasonable consistency over families: average coefficient of inbreeding, F=0.091; multilocus outcrossing rate, tm=0.765. The results indicated that this population practices a mixture of selfing and outcrossing for reproduction, and this has several implications on breeding strategies, such as: for recurrent selection, more than one generation is required for attaining a condition close to equilibrium; even without epistasis progress from recurrent selection is no longer a function of additive variance alone, depending also on D1 (which may be negative) and D2; and immediate and permanent progress tend to be different and are not easily estimatable. The need for estimating the outcrossing rate is stressed for populations that are not typically allogamic or autogamic.
Palavras-Chave: | Auto-polinizacao; Melhoramento de planta; Polinizacao cruzada; RAPD; Watermelon.
Thesagro: | Citrullus Lanatus; Marcador Molecular; Melancia.
Thesaurus Nal: | genetic markers; inbreeding; outcrossing; plant breeding; watermelons.
Categoria do assunto: | G Melhoramento Genético
Registro original: | Embrapa Semiárido (CPATSA)
Exemplares: | CPATSA - (8594-1) - UPC - AP - PP -  -  -  - DIS