Estimating coancestry within open-pollinated progenies of a dioecious species: the case study of Myracrodruon urundeuva

Moraes, Marcela Aparecida de; Gaino, Ana Paula da Silva de Campos; Freitas, Miguel Luiz Menezes; Sebbenn, Alexandre Magno

doi:10.1515/sg-2012-0032

Cited by 13 publications

(12 citation statements)

References 37 publications

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“…But the estimated values were in some cases lower than 0.125, ranging from -0.022 to 0.309. The cause of lower than expected pairwise estimates is the fact that estimates of relatedness based on genetic markers need a large number of loci, ideally about 20 (Moraes et al, 2012;Ritland, 1996;Wang, 2011). The seven loci used here are probably not sufficient for robust estimates of all pairwise coancestry coefficients.…”

Section: Inbreedingmentioning

confidence: 89%

Pollen contamination and nonrandom mating in a Eucalyptus camaldulensis Dehnh seedling seed orchard

et al. 2016

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Eucalyptus camaldulensishas potential for timber, energy, pulp and cellulose production in Brazil due to its ability to adapt to a variety of environmental conditions. The use of improved seeds, selected for economic growth traits, is necessary to increase productivity of commercial stands. Seed seedlings orchards (SSO) are one option for improved seed production. However, pollen contamination from unimproved populations, as well as non-random mating in the SSO, can decrease the predicted genetic gains in selected populations. Thus, we investigate the mating system, pollen flow and dispersal patterns in anE. camaldulensisSSO and progeny test (PT), established with seedlings collected in the SSO, using seven microsatellite loci. All trees in the SSO were mapped, sampled, and genotyped. For the PT, we sampled, genotyped, and measured the total height of seedlings from 25 families. We detected 10 % inbreeding in the PT, resulting mainly from selfing. Furthermore, we found a correlated mating rate of 18.5 % in the SSO, indicating that within the PT there are some full-sibs. Using paternity analysis, we found 14.7 % pollen contamination and a pattern of pollen dispersal between near neighbor trees in the SSO. We found 9.5 % of inbreeding depression for seedlings height. Due to pollen contamination and nonrandom mating in the SSO, the actual genetic gains for growth traits in the PT are probably lower than the predicted genetic gains. We discuss some management strategies in the SSO that can be used to increase genetic gains in commercial reforestation established using seeds collected from the SSO

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Section: Inbreedingmentioning

confidence: 89%

Pollen contamination and nonrandom mating in a Eucalyptus camaldulensis Dehnh seedling seed orchard

et al. 2016

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“…As the endogamy originating from mating between related individuals is equal to the coancestry coefficient among parents (Moraes et al, 2012), which in the present case of full-sibs is 0.25, we would expect at least 25 % inbreeding in descendants of crossings between the clones suggested for selection. Inbreeding in Eucalyptus species produces inbreeding depression, resulting in mortality, infertility, among other effects, as has been well documented in the literature (Eldridge and Griffin, 1983;Costa and Silva et al, 2011;Wu et al, 2015;Hedrick et al, 2016).…”

Section: Clone Selectionmentioning

confidence: 71%

Clonal selection ofEucalyptus grandis x Eucalyptus globulusfor productivity, adaptability, and stability, using SNP markers

et al. 2016

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In Uruguay, reforestations with Eucalyptus sp. is of fundamental importance to supply paper, pulp, and wood production. This study investigates genetic, productivity, stability, and adaptability parameters in the selection of Eucalypts grandis x Eucalyptus globulus full-sib hybrid clones. The study was conducted in a clonal test, repeated in two different soils types, in Rio Negro State, Uruguay. The population was characterized phenotypically for diameter at breast height (dbh) and genotyped for SNP markers (EuCHIP60K chip). Mean dbh was similar between sites and the genotype-environment interaction was simple. We found high genotype correlation in clone performance between environments (0.708), indicating the possibility of selecting the same clones for both study locations. Mean heritability between clones (0.724), coefficient of individual genetic variation (10.9 %), and relative variation (0.916), suggest the possibility of gains (estimated at 3.1 % for both sites together) by selecting clones with higher growth rates. A total of 15,196 SNPs were used to confirm parentage and test a genomic selection model for dbh. The predictive capacity was negative (-0.15) given the small population size (78 individuals). The most adaptable material among the tested study sites presented higher values for SNP heterozygosity. Thus, using molecular markers to identify clones responsive to environmental changes can act as a powerful tool in Eucalyptus breeding programs. The hybrid population showed greater adaptability than E. globulus for this region.

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“…Estimates of pairwise coancestry between parents and descendants were sometimes lower (juveniles-mother: θ 1 = 0.19; juveniles-father: θ 2 = 0.19; PA: offspring-father, θ 2 = 0.13) and sometimes higher (offspring-mother, PA: θ 1 = 0.42; PF: θ 1 = 0.32; offspring-father in PF, θ 2 = 0.29) than expected (0.25). These results can be explained by the fact that estimates of pairwise relatedness between parents using gene markers and probabilistic methods such as those used here (Loiselle et al, 1995) are subjected to bias, which can result in estimates that are different than expected, especially if the number of loci is lower than 20; in our case, estimates were based on six loci (see, Ackerman et al, 2017;Moraes, Gaino, Moraes, Freitas & Sebbenn, 2012).…”

Section: Pairwise Coancestrymentioning

confidence: 83%

“…Due to this, Moraes et al. () have suggested that coancestry within families must be preferentially estimated by mating system indices, especially to determine the variance effective size within families.…”

Section: Discussionmentioning

confidence: 99%

“…Obviously, the Loiselle et al (1995) method is also affected by inbreeding in the mother trees (F m ), selfing (s = 1 − t m ), and correlated mating (r p ), as these indices increase the frequency of identity-by-decent alleles within families. However, the Loiselle et al (1995) method is probabilistic, and even if individuals are related, θ w values may be different than expected and in some cases can be negatives (see Ackerman et al, 2017;Moraes et al, 2012), resulting in underestimates in the pairwise coancestry coefficient. Due to this, Moraes et al (2012) have suggested that coancestry within families must be preferentially estimated by mating system indices, especially to determine the variance effective size within families.…”

Section: Pairwise Coancestrymentioning

confidence: 99%

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Long‐distance pollen and seed dispersal and inbreeding depression in Hymenaea stigonocarpa (Fabaceae: Caesalpinioideae) in the Brazilian savannah

Moraes

Kubota

Rossini

et al. 2018

Ecology and Evolution

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Hymenaea stigonocarpa is a neotropical tree that is economically important due to its high‐quality wood; however, because it has been exploited extensively, it is currently considered threatened. Microsatellite loci were used to investigate the pollen and seed dispersal, mating patterns, spatial genetic structure (SGS), genetic diversity, and inbreeding depression in H. stigonocarpa adults, juveniles, and open‐pollinated seeds, which were sampled from isolated trees in a pasture and trees within a forest fragment in the Brazilian savannah. We found that the species presented a mixed mating system, with population and individual variations in the outcrossing rate (0.53–1.0). The studied populations were not genetically isolated due to pollen and seed flow between the studied populations and between the populations and individuals located outside of the study area. Pollen and seed dispersal occurred over long distances (>8 km); however, the dispersal patterns were isolated by distance, with a high frequency of mating occurring between near‐neighbor trees and seeds dispersed near the parent trees. The correlated mating for individual seed trees was higher within than among fruits, indicating that fruits present a high proportion of full‐sibs. Genetic diversity and SGS were similar among the populations, but offspring showed evidence of inbreeding, mainly originating from mating among related trees, which suggests inbreeding depression between the seed and adult stages. Selfing resulted in a higher inbreeding depression than mating among relatives, as assessed through survival and height. As the populations are not genetically isolated, both are important targets for in situ conservation to maintain their genetic diversity; for ex situ conservation, seeds can be collected from at least 78 trees in both populations separated by at least 250 m.

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Estimating coancestry within open-pollinated progenies of a dioecious species: the case study of Myracrodruon urundeuva

Cited by 13 publications

References 37 publications

Pollen contamination and nonrandom mating in a Eucalyptus camaldulensis Dehnh seedling seed orchard

Pollen contamination and nonrandom mating in a Eucalyptus camaldulensis Dehnh seedling seed orchard

Clonal selection ofEucalyptus grandis x Eucalyptus globulusfor productivity, adaptability, and stability, using SNP markers

Long‐distance pollen and seed dispersal and inbreeding depression in Hymenaea stigonocarpa (Fabaceae: Caesalpinioideae) in the Brazilian savannah

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