Data/hora: 17/06/2024 10:20:44

Biblioteca(s): | Embrapa Gado de Corte.
Data corrente: | 21/02/2011
Data da última atualização: | 05/08/2011
Autoria: | GARCIA, M. de O. S.; RESENDE, R. M. S.; CHIARI, L.; ZUCCHI, M. I.; SOUZA, A. P. de.
Afiliação: | Melissa de Oliveira Santos-Garcia, UNICAMP; ROSANGELA MARIA SIMEAO RESENDE, CNPGC; LUCIMARA CHIARI, CNPGC; Maria Imaculada Zucchi, Polo Apta Centro Sul; Anete Pereira de Souza, UNICAMP.
Título: | Mating systems in tropical forages: Stylosanthes capitata Vog. and Stylosanthes guianensis (Aubl.) Sw.
Ano de publicação: | 2011
Fonte/Imprenta: | Euphytica, v. 178, n. 2, p.185-193, Mar. 2011
Idioma: | Português
Conteúdo: | Stylosanthes capitata and S. guianensis are important forage legumes for tropical areas. The only available estimates of S. capitata and S. guianensis outcrossing rates were based on morphological markers, and the genus is considered as being mainly self-pollinated. Here we describe an estimation of the outcrossing rate in S. capitata and S. guianensis using microsatellite markers. The outcrossing rates were estimated in S. capitata and S. guianensis openpollinated populations of 20 progenies consisting of ten individuals each. The multi locus outcrossing rate for S. capitata was estimated using 10 polymorphic loci, whereas five microsatellites were used for S. guianensis. The multi locus outcrossing rates for S. capitata and S. guianensis were 31 and 26%, respectively, suggesting a mixed mating system with predominance of autogamy. Comparison of single locus and multi locus estimates of outcrossing rates indicated that little inbreeding other than selfing occurred. The estimated Wright?s fixation index of the parental generation was lower than expected based on the multi locus outcrossing rate, possibly resulting from the use of some heterozygous breeding genotypes for the study. The data on the outcrossing rate described here are potentially useful for breeding programs and for maintenance of germplasm collections of these Stylosanthes species.
Palavras-Chave: | Stylosanthe guianensis.
Thesagro: | Leguminosa Forrageira; Pastagem.
Thesaurus Nal: | Stylosanthes capitata.
Categoria do assunto: | K Ciência Florestal e Produtos de Origem Vegetal
Registro original: | Embrapa Gado de Corte (CNPGC)
Exemplares: | CNPGC - (13762-1) - UPC - AP - DD -  -  -  - DIS