Consulta: subjectFacets:"Selfing"
Registros recuperados: 5
Data/hora: 03/06/2024 06:34:24

Diversidad genética, estructura genética y sistema de cruzamiento en Pinus johannis.
Provedor de dados: 32
Autores: García Gómez, Verónica.
Pinus johannis M. F. Robert es una especie endémica de México que se distribuye en poblaciones aisladas en la sierra Madre Oriental. Los objetivos del presente estudio fueron: a) conocer el nivel de diversidad genética y estructura genética de P. johannis; y b) estimar su tasa de cruzamiento. Se utilizaron 143 árboles en cuatro poblaciones de Pinus johannis para estimar los parámetros de diversidad genética tales como número promedio de alelos por locus, porcentaje de loci polimórficos, heterocigosidad observada y esperada. Para calcular la tasa de cruzamiento (t) se utilizó tejido de semilla de 127 árboles. Para conocer la diversidad genética se analizaron nueve sistemas enzimáticos en geles de almidón utilizando electroforesis, y tres para el sistema de...
Palavras-chave: Heterocigosidad; Índice de fijación; Distancia genética; Tasa de cruzamiento; Autofecundación; Heterozygosity; Fixation index; Genetic distance; Outcrossing rate; Selfing.
Ano: 2013
URL: http://hdl.handle.net/10521/2377

ClonEstiMate, a Bayesian method for quantifying rates of clonality of populations genotyped at two-time steps
Provedor de dados: 5
Autores: Becheler, Ronan; Masson, Jean-pierre; Arnaud-haond, Sophie; Halkett, Fabien; Mariette, Stephanie; Guillemin, Marie-laure; Valero, Myriam; Destombe, Christophe; Stoeckel, Solenn.
Partial clonality is commonly used in Eukaryotes and has large consequences for their evolution and ecology. Assessing accurately the relative importance of clonal versus sexual reproduction matters for studying and managing such species. Here, we proposed a Bayesian approach, ClonEstiMate, to infer rates of clonality c from populations sampled twice over a short time interval, ideally one generation time. The method relies on the likelihood of the transitions between genotype frequencies of ancestral and descendent populations, using an extended Wright-Fisher model explicitly integrating reproductive modes. Our model provides posterior probability distribution of inferred c, given the assumed rates of mutation, as well as inbreeding and selfing when...
Tipo: Text
Palavras-chave: Inbreeding; Instantaneous inference; Population genetics model; Rate of asexuality; Selfing.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00390/50187/50810.pdf

METHOD FOR OVERCOMING THE PASSION FRUIT SELF-INCOMPATIBILITY
Provedor de dados: 94
Autores: LIRA JÚNIOR,JOSÉ SEVERINO DE; BRUCKNER,CLÁUDIO HORST; CARNEIRO,PEDRO CRESCÊNCIO SOUZA.
ABSTRACT  The methodology of self-pollination of passion fruit flowers at anthesis after stigma excision was proposed. This method was compared with self-pollination procedures at anthesis and at the stage of flower bud. Two genotypes (M7 and N9), propagated by cuttings were studied. Self-pollinations were performed at 1 pm, 1 pm and 5 pm or 5 pm. Fruit set (%), fruit mass (g), pulp mass (g), pulp/fruit ratio and seed number per fruit were evaluated and compared to fruits derived from M7 x N9 and N9 x M7 crosses. No fruit set was obtained from self-pollination at anthesis, which confirms the self-incompatibility of both genotypes. Self-pollination after stigma excision was the best procedure, reaching average fruit set of 73.61 % (13 hours) and 81.94 %...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Passiflora edulis; Pollination; Selfing; Endogamous progenies.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452016000400804

Depression by inbreeding after four sucessive self-pollination squash generations
Provedor de dados: 63
Autores: Cardoso,Antonio Ismael Inácio.
The strategy for breeding F1 hybrid squash is to develop parental lines through self-pollination. However, it increases plant mean homozygosis, which is not the natural genetic state of a cross-pollinated species, and can cause "inbreeding depression". The objective of this work was to evaluate this depression with sucessive generations of self-pollination (without selection) in Cucurbita moschata, cv. Piramoita. Populations were obtained from lines with one to four generations of self-pollination (obtained by the SSD method), from the original cv. Piramoita (population S0). Randomized blocks were used with five treatments (different generations of self-pollination - S0 to S4), six replicates and five plants per plot. Regression analysis was made by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucurbita moschata; Cucurbits; Selfing.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000200016

Breeding system and pollination of Pleroma trichopodum DC. (Melastomataceae): a potential species for the restoration of Atlantic Forest in southern Brazil
Provedor de dados: 39
Autores: Malucelli,Tiago Simões; Maia,Fabiano Rodrigo; Varassin,Isabela Galarda.
ABSTRACT Plant-pollinator interactions and their reproductive implications are of central importance to the organization of plant populations and communities in restoration areas. We studied the breeding system and flower visitors of Pleroma trichopodum, a pioneer species of the Atlantic Forest. We attempted to answer three questions: (1) Is P. trichopodum dependent on pollinators and mates for reproduction? (2) What are the pollinators of P. trichopodum? (3) Do tree flower-density and flowering-tree density of P. trichopodum enhance the visitation rate of focal trees and their flowers? We tested the breeding system through pollination treatments. We performed focal observations on 10 trees and analyzed the relationship between tree and flower visitation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atlantic Forest; Breeding system; Floral density; Pioneer; Plant-pollinator interactions; Pleroma trichopodum; Restoration; Selfing.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000300402