The effects of pollen dispersal and mating pattern on inbreeding depression and hybrid vigor in Balfourodendron riedelianum (Engl.) Engl. (Rutaceae)

Aguiar, Bruna Ibanes; Freitas, Miguel Luiz Menezes; Zannato, Antonio S.; Tambarussi, Evandro Vagner; Moraes, Mário Luiz Teixeira de; Ambrosano, Marcelo Nalin; Pereira, Lya Carolina da Silva Mariano; Gandara, Flávio Bertin; Kageyama, Paulo Yoshio; Sebbenn, Alexandre Magno

doi:10.1007/s10592-020-01250-0

Cited by 14 publications

(4 citation statements)

References 38 publications

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“…Understanding the effects of inbreeding on tropical rainforest tree species is of direct practical importance for genetic conservation, breeding, and environmental restoration to guide sustainable management of populations, particularly for threatened species. Relatively few studies have directly measured ID in tropical tree populations (Chaves et al, 2011;Jolivet et al, 2013;Bessega et al, 2017;Pupin et al, 2019;Aguiar et al, 2020;Takeuchi and Diway, 2021), one -23 -obvious reason being the difficulty to measure all fitness components in long-living organisms.…”

Section: Discussionmentioning

confidence: 99%

Inbreeding depression affects the growth of seedlings of an African timber species with a mixed mating reproductive system, Pericopsis elata (Harms) Meeuwen

Angbonda,

Ilunga-Mulala,

Bourland

et al. 2024

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Selfing or mating between related individuals can lead to inbreeding depression (ID), which can influence the survival, growth and evolution of populations of tree species. As selective logging involves a decrease in the density of congeneric partners, it could lead to increasing biparental inbreeding or self-fertilization, exposing the population to higher ID. We assessed the influence of inbreeding on the growth of a commercial timber species, Pericopsis elata (Fabaceae), which produced about 54% of self-fertilized seedlings in a natural population of the Congo basin. We followed the survival and growth of 540 plants raised in a plantation along a gradient of plant density (0.07 to 15.9 plants per m2). Parentage analysis allowed us distinguishing selfed and outcrossed seedlings. The annual growth was higher for outcrossed than selfed plants, on average by 10.8% for diameter and 12.9% for height growth. Based on the above ground biomass after 41 months, we estimated ID at δ = 0.32, while a life-time estimate of ID based on the proportions of selfed plants at seedling and adult stages led to δ = 0.7. The level of ID on growth rate did not change significantly with age but tended to vanish under high competition. P. elata is a particularly interesting model because inbreeding depression is partial, with about 26% of reproducing adults resulting from selfing, contrary to most tropical tree species where selfed individuals usually die before reaching adulthood. Hence, the risks of ID must be considered in the management and conservation of the species.

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Section: Discussionmentioning

confidence: 99%

Inbreeding depression affects the growth of seedlings of an African timber species with a mixed mating reproductive system, Pericopsis elata (Harms) Meeuwen

Angbonda,

Ilunga-Mulala,

Bourland

et al. 2024

Preprint

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“…In Eucalyptus globulus, the average ID of sel ng progenies was detected from 22 to 27% on growth in the rst 4 years (Nickolas et al 2019). There was a 19.6% biomass reduction in inbred individuals of white bark pine (Pinus albicaulis)(Bower and Aitken 2007) and an approximately 8.1-12.4% ID on root collar circumference and plant height of full-sib offspring in Balfourodendron riedelianum (Aguiar et al 2020). The ID levels of seed quality traits (percentage of full seeds, seed weight, germination rate, germination potential, etc.)…”

Section: Introductionmentioning

confidence: 99%

How does population outcrossing rate influence seed quality? Evidence from a 58-year-old seed tree stand of Pinus massoniana

Wei

Chen

et al. 2022

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Inbreeding is thought to be a key adverse factor impacting the genetic quality of seeds in seed production populations and the inbreeding degree (i.e., selfing or outcrossing rate) of seed production populations have been extensively assessed through mating system analysis. The depression effect of inbreeding on seed quality traits in seed production populations under open-pollination conditions has not yet been clearly described. In this study, the open-pollinated seeds were collected from 26 mother trees in a 58-year-old seed tree stand. Three seed quality traits, including thousand-seed weight (TSW), germination rate (GR) and germination potential (GP), were measured, and the seeds from eight of 26 families with significant differences in seed quality traits were genotyped through twelve microsatellite markers. In addition, the seeds and sprouts (germinated seeds) from six families were genotyped to reveal the effect of inbreeding on seed germination. The three seed quality traits significantly differed among families (p<0.001). The multilocus outcrossing rate (tm = 0.889) and single-locus outcrossing rate (ts = 0.648) of overall seeds indicated apparent selfing (11.1%) and biparental inbreeding (24.0%). The outcrossing rate in the sprout group (tm = 0.919, ts = 0.788) was higher than that in the seed group (tm = 0.833, ts = 0.646), and the difference in ts between groups was different from zero under the 95% confidence interval (0.024-0.260), suggesting that inbreeding negatively affected seed germination. Linear regression demonstrated that TSW was positively correlated with tm and ts, while GR was negatively related to tm-ts and positively related to ts, implying that seed mass (development) was probably more affected by self-fertilization, but germination capacity was more influenced by biparental inbreeding. Roughly, the inbreeding depression (ID) of TSW was 26.3% with a 0.1 decrease in tm, while GR was 8.4% with a 0.1 decrease in ts. In summary, these results suggest that the IDs during seed development and the germination stage of Masson pine were nonignorable and that more attention should be given to the establishment and management of Masson pine seed production.

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“…These factors can augment the risk of extinction for species and populations due to restrictions in gene flow dynamics and changes in mating patterns that can continue for several generations [3][4][5][6][7]. Thus, the outcome for a species that remains isolated will depend on its ability to persist, despite the size of the remaining reproductive population (bottleneck effect), restrictions in gene flow, genetic drift, and increases in self-fertilization and mating between relatives, which generally result in a decrease in genetic diversity [8][9][10] and accentuate inbreeding in descendant populations, where the inbreeding can result in inbreeding depression (decrease in survival, adaptation, and growth vigor) [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Landscape barriers to pollen and seed flow in the dioecious tropical tree Astronium fraxinifolium in Brazilian savannah

et al. 2021

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Gene flow studies provide information on gene exchange between populations, which is essential for developing genetic conservation strategies. Such analyses enable a better understanding of the life history and seed and pollen dispersal mechanisms of plant species. In this study, we investigate pollen and seed flow in a regenerant population of the pioneer species Astronium fraxinifolium in an area degraded during the construction of a hydroelectric dam. We mapped, sampled, sexed, and genotyped 386 individuals in the regenerant population (RP), as well as 128 adult trees located along two highways adjacent to the degraded area; one in Mato Grosso do Sul State (MS) and other in São Paulo State (SP). Parentage analyses was carried out for 370 individuals of the RP population, using as putative parents 348 individuals from RP and all 128 individuals sampled in MS and SP. Based on parentage analysis and eight microsatellite loci, our analyses revealed that for individuals of the RP with an identified father (pollen donor), 1.1% of the pollen was dispersed up to 532 m, while for those with an identified mother (seed donor), 0.5% of seeds were dispersed up to 4,782 m. However, a large proportion of pollen (76.5%) and seeds (57%) immigrated from trees outside the sampled populations. Pollen and seeds were dispersed through a pattern of isolation by distance. Genetic diversity was significantly similar between adults of both highway populations and individuals from RP, with significant levels of inbreeding detected only in RP. Our results demonstrate that the nearest trees contributed pollen and seeds for the recovery of the degraded area, indicating reproductive spatial isolation among the sampled populations due to the damming of the river. Such results help to understand the process of regeneration for A. fraxinifolium in regenerant populations to inform strategies for conservation and environmental recovery with this species.

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The effects of pollen dispersal and mating pattern on inbreeding depression and hybrid vigor in Balfourodendron riedelianum (Engl.) Engl. (Rutaceae)

Cited by 14 publications

References 38 publications

Inbreeding depression affects the growth of seedlings of an African timber species with a mixed mating reproductive system, Pericopsis elata (Harms) Meeuwen

Inbreeding depression affects the growth of seedlings of an African timber species with a mixed mating reproductive system, Pericopsis elata (Harms) Meeuwen

How does population outcrossing rate influence seed quality? Evidence from a 58-year-old seed tree stand of Pinus massoniana

Landscape barriers to pollen and seed flow in the dioecious tropical tree Astronium fraxinifolium in Brazilian savannah

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