Outcrossing Rate and Inbreeding Depression in Two Annual Monoecious Herbs, Begonia hirsuta and B. semiovata

Evolution ◽  
1993 ◽  
Vol 47 (1) ◽  
pp. 125 ◽  
Author(s):  
Jon Agren ◽  
Douglas W. Schemske
Keyword(s):  
Inbreeding Depression ◽  
Outcrossing Rate

Inbreeding depression in a rare deceptive orchid

2001 ◽  
Vol 79 (10) ◽  
pp. 1181-1188 ◽  
Author(s):  
Jean-Baptiste Ferdy ◽  
Sandrine Loriot ◽  
Michel Sandmeier ◽  
Madeleine Lefranc ◽  
Christian Raquin
Keyword(s):  
Inbreeding Depression ◽  
Conservation Biology ◽  
Resource Availability ◽  
Genetic Load ◽  
Outcrossing Rate ◽  
Deleterious Mutations ◽  
Geographic Scale ◽  
Deceptive Pollination ◽  
Inbreeding Level ◽  
Small Geographic Scale

We quantified inbreeding depression for seed maturation and germination in a deceptively pollinated orchid (Dactylorhiza praetermissa (Druce) Soó). Deceptive species do not provide any reward to their pollinators, which thus visit few flowers per plant. Therefore, deceptive species are predicted to experience high outcrossing. In agreement with the prediction that species with high outcrossing rate should possess a heavy genetic load, we demonstrated inbreeding depression in one of the populations we studied. More surprisingly, we found some evidence of inbreeding depression at a small geographic scale. This was not expected, as deceptive orchids generally disperse their pollen and their seeds over long distances. We also demonstrated that the position of a flower within an inflorescence interacts with the type of cross. This indicates that resource availability might modify how severely deleterious mutations affect reproductive success. This could also explain why the intensity of inbreeding depression seems, in the populations we studied, to be determined more by environmental factors than by inbreeding level, as estimated from molecular markers. Inferences in terms of conservation biology are drawn from these results.Key words: inbreeding depression, deceptive pollination, orchid, Dactylorhiza praetermissa.

Mating system of Calluna vulgaris: self-sterility and outcrossing estimations

1998 ◽  
Vol 76 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Grégory Mahy ◽  
Anne-Laure Jacquemart
Keyword(s):  
Mating System ◽  
Inbreeding Depression ◽  
Calluna Vulgaris ◽  
Pollen Tubes ◽  
Outcrossing Rate ◽  
Evolutionary Significance ◽  
Mixed Mating ◽  
Mixed Mating System ◽  
Cross Pollination ◽  
Mating System Evolution

The evolutionary significance of a mixed mating system is currently under debate. Calluna vulgaris (L). Hull, a widespread European shrub, is likely to undergo mixed mating because of geitonogamy. Mating system was investigated in three populations of C. vulgaris by means of greenhouse controlled crosses, pollen tube observations, and outcrossing rate estimations from allozyme markers. The species is highly self-sterile, most probably as a result of early inbreeding depression. Mean fruit set and mean seed number per fruit following hand self-pollination were 48 and 13%, respectively, of those following cross-pollination. Pollen tubes produced by self pollen penetrated the ovary with the same success as those from cross-pollination. Multilocus estimates of the outcrossing rates ranged from 0.71 to 0.90, and two estimates were significantly different from 1.00. Calluna vulgaris could thus be classified as being mixed mating with predominant allogamy. Single-locus estimates did not differ significantly from multilocus estimates suggesting that biparental inbreeding did not contribute to the apparent selfing rate. The maintenance of high early inbreeding depression despite an intermediate level of selfing is discussed with respect to recent theories on mating system evolution. Key words: Calluna vulgaris, mating system, self-sterility, pollen tubes, outcrossing rate, inbreeding depression.

scholarly journals A Bayesian method for the joint estimation of outcrossing rate and inbreeding depression

Heredity ◽  
2012 ◽  
Vol 109 (6) ◽  
pp. 393-400 ◽  
Author(s):  
V A Koelling ◽  
P J Monnahan ◽  
J K Kelly
Keyword(s):  
Inbreeding Depression ◽  
Bayesian Method ◽  
Outcrossing Rate ◽  
Joint Estimation

scholarly journals Outcrossing rate and inbreeding depression in the herbaceous autotetraploid, Campanula americana

Heredity ◽  
2003 ◽  
Vol 90 (4) ◽  
pp. 308-315 ◽  
Author(s):  
L F Galloway ◽  
J R Etterson ◽  
J L Hamrick
Keyword(s):  
Inbreeding Depression ◽  
Outcrossing Rate ◽  
Campanula Americana
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