Mating system and multilocus associations in a natural population of Pseudotsuga menziesii (Mirb.) Franco

1987 ◽  
Vol 73 (6) ◽  
pp. 799-808 ◽  
Author(s):  
F. C. Yeh ◽  
K. Morgan
Keyword(s):  
Mating System ◽  
Natural Population ◽  
Pseudotsuga Menziesii ◽  
Multilocus Associations

scholarly journals How and When Does Outcrossing Occur in the Predominantly Selfing Species Medicago truncatula?

2021 ◽  
Vol 12 ◽  
Author(s):  
Margaux Jullien ◽  
Joëlle Ronfort ◽  
Laurène Gay
Keyword(s):  
Mating System ◽  
Natural Population ◽  
Medicago Truncatula ◽  
Empirical Studies ◽  
Reproductive Mode ◽  
Outcrossing Rate ◽  
Population Variation ◽  
Selfing Rate ◽  
Flowering Season ◽  
Selfing Species

Empirical studies on natural populations of Medicago truncatula revealed selfing rates higher than 80%, but never up to 100%. Similarly, several studies of predominantly selfing species show variability in the level of residual outcrossing between populations and also between temporal samples of the same population. However, these studies measure global selfing rates at the scale of the population and we do not know whether there is intra-population variation and how outcrossing events are distributed, between genotypes, plants, flowers, or seeds. Theoretical studies predict the maintenance of residual outcrossing in highly selfing species due to environmental (e.g., pollen biology) and/or genetic determinants and decompositions of the variation in outcrossing rate using experimental data can be very informative to test these hypotheses. Here, we focus on one natural population of M. truncatula in order to describe precisely its mating system. In particular, we investigated the determinants of the selfing rate by testing for seasonal variations (environmental determinism) and variations between genotypes (genetic determinism). We measured selfing rates in maternal progenies from plants collected widely across a natural population. For each plant, we collected pods from flowers produced at the beginning and at the end of the flowering season to test for a seasonal variation in the outcrossing rate. For each collected offspring, we also estimated the likelihood that it was issued from a self-fertilization event and assessed the genetic component of variation of this mating system measure. We found a significant, albeit small, increase in outcrossing rate in progenies collected at the end [tm = 0.137 (SD = 0.025)] compared to those collected at the beginning [tm = 0.083 (0.016)] of the flowering season. A significant between genotypes variation in selfing rate was also detected, resulting in a heritability of 9% for the rate of residual outcrossing. Altogether, our work shows that despite a predominantly selfing reproductive mode, M. truncatula displays variation in residual outcrossing rate, and that this trait is likely under a complex determinism combining environmental and genetic factors. We discuss the evolutionary implications of our results for the population.

scholarly journals Mating system in a natural population of Theobroma grandiflorum (Willd. ex Spreng.) Schum., by microsatellite markers

2003 ◽  
Vol 26 (3) ◽  
pp. 373-379 ◽  
Author(s):  
Rafael M. Alves ◽  
Angela S. Artero ◽  
Alexandre M. Sebbenn ◽  
Antonio Figueira
Keyword(s):  
Microsatellite Markers ◽  
Mating System ◽  
Natural Population ◽  
Theobroma Grandiflorum

Mating System in a Low-density Natural Population of the Dioecious Wind-pollinated Patagonian Cypress

Genetica ◽  
2006 ◽  
Vol 126 (3) ◽  
pp. 315-321 ◽  
Author(s):  
Mario J. Pastorino ◽  
Leonardo A. Gallo
Keyword(s):  
Mating System ◽  
Natural Population ◽  
Low Density

scholarly journals Mother-offspring data in a study of the mating system in a natural population of Bulinus globosus (Gastropoda: Planorbidae) in Zimbabwe

1996 ◽  
Vol 68 (2) ◽  
pp. 95-100 ◽  
Author(s):  
S. Mukaratirwa ◽  
S. K. Chandiwana ◽  
H. R. Siegismund ◽  
T. K. Kristensen
Keyword(s):  
Genetic Structure ◽  
Mating System ◽  
Genetic Markers ◽  
Natural Population ◽  
Limited Extent ◽  
Natural Conditions ◽  
Bulinus Globosus ◽  
Cross Fertilization

SummaryThe mating system of a natural population of Bulinus globosus from the Chiweshe area, Zimbabwe, was studied with mother—offspring data using isozyme genetic markers. The study was done in response to work on the genetic structure of this population which suggested a limited extent of cross-fertilization. Of the 24 adults whose progenies were analysed, at least 15 showed evidence of outcrossing and 9 had results consistent with selfing. These results show that the two modes of reproduction are important under natural conditions and the mating system of this population is considered to be ‘partially-selfing’.

Mating system analysis in a natural population of Acacia nilotica subspecies leiocarpa

1994 ◽  
Vol 89-89 (7-8) ◽  
pp. 931-935 ◽  
Author(s):  
A. K. Mandal ◽  
R. A. Ennos ◽  
C. W. Fagg
Keyword(s):  
Mating System ◽  
Natural Population ◽  
System Analysis ◽  
Acacia Nilotica

scholarly journals Mating system variation among populations, individuals and within and among fruits in Bertholletia excelsa

2015 ◽  
Vol 64 (1-6) ◽  
pp. 248-259 ◽  
Author(s):  
L.H.O. Wadt ◽  
A. B. Baldoni ◽  
V. S. Silva ◽  
T. Campos ◽  
K. Martins ◽  
...  
Keyword(s):  
Mating System ◽  
Natural Population ◽  
Natural Populations ◽  
Effective Size ◽  
Fixation Index ◽  
Bertholletia Excelsa ◽  
Selection For ◽  
Conservation Breeding ◽  
Seed Collections ◽  
Different Levels

AbstractThe aim of this study was to investigate variation in mating system among three Brazilian Amazon populations of the tree Bertholletia excelsa with different levels of anthropogenic interventions. We collected open-pollinated seeds from one natural population, remnant trees dispersed in a pasture, and trees from a plantation. Outcrossing rate not varied among the populations and indicates that all seeds were originated from outcrossing (tm=1.0). Mating among relatives was significant higher in the plantation than forest and pasture populations, probably due the fact that many trees are related in the plantation. Correlated mating was significantly higher in pasture (rp=0.47) and plantation (rp=0.51) than in the natural population (rp=0.22), suggesting that trees in natural population are pollinated by a higher number of pollen donors. The paternity correlation was significantly higher within (rp(w)=0.41) than among fruits (rp(a)=0.18), showing a higher probability to find full-sibs within than among fruits. The fixation index was generally lower in seed trees than in their seedlings, suggesting selection for heterozygous individuals from seedling to adult stages. Progeny arrays collected from the natural population had a lower proportion of pairwise full-sibs than in pasture and plantation and higher variance effective size (2.75) than trees in pasture (2.15) and plantations (2.22). Results highlight that seed collections for conservation, breeding and reforestation programs preferentially should be carried out in natural populations due low proportion highest variance effective size within progeny.

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