Influence of Long-Distance Seed Dispersal on the Genetic Diversity of Seed Rain in Fragmented Pinus densiflora Populations Relative to Pollen-Mediated Gene Flow

Ozawa, Hajime; Watanabe, Atsushi; Uchiyama, Kentaro; Saito, Yoko; Ide, Yuji

doi:10.1093/jhered/est022

Cited by 9 publications

(6 citation statements)

References 74 publications

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“…More broadly, even when the movement of pollen or seed is estimated via direct or indirect methods (Bittencourt & Sebbenn, ; Guidugli et al., ; Ismail et al., ; Sebbenn et al., ), the ways in which this movement influences standing patterns of genetic variation (e.g., allelic diversity and genetic structure) in established seedlings remain poorly resolved. Therefore, directly comparing the relative contributions of male gametes from pollen sources and female gametes from seed sources to resulting patterns of genetic diversity and structure in the same individual seedlings (e.g., Ozawa, Watanabe, Uchiyama, Saito, & Ide, ; Sork et al., ) would provide a useful perspective on these long‐standing hypotheses concerning impacts of habitat loss and fragmentation on plant populations.…”

Section: Introductionmentioning

confidence: 99%

Habitat loss and fragmentation reduce effective gene flow by disrupting seed dispersal in a neotropical palm

Browne

Karubian

2018

Molecular Ecology

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Habitat loss and fragmentation often reduce gene flow and genetic diversity in plants by disrupting the movement of pollen and seed. However, direct comparisons of the contributions of pollen vs. seed dispersal to genetic variation in fragmented landscapes are lacking. To address this knowledge gap, we partitioned the genetic diversity contributed by male gametes from pollen sources and female gametes from seed sources within established seedlings of the palm Oenocarpus bataua in forest fragments and continuous forest in northwest Ecuador. This approach allowed us to quantify the separate contributions of each of these two dispersal processes to genetic variation. Compared to continuous forest, fragments had stronger spatial genetic structure, especially among female gametes, and reduced effective population sizes. We found that within and among fragments, allelic diversity was lower and genetic structure higher for female gametes than for male gametes. Moreover, female gametic allelic diversity in fragments decreased with decreasing surrounding forest cover, while male gametic allelic diversity did not. These results indicate that limited seed dispersal within and among fragments restricts genetic diversity and strengthens genetic structure in this system. Although pollen movement may also be impacted by habitat loss and fragmentation, it nonetheless serves to promote gene flow and diversity within and among fragments. Pollen and seed dispersal play distinctive roles in determining patterns of genetic variation in fragmented landscapes, and maintaining the integrity of both dispersal processes will be critical to managing and conserving genetic variation in the face of continuing habitat loss and fragmentation in tropical landscapes.

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Section: Introductionmentioning

confidence: 99%

Habitat loss and fragmentation reduce effective gene flow by disrupting seed dispersal in a neotropical palm

Browne

Karubian

2018

Molecular Ecology

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“…Seed and pollen both contribute to gene flow in forest trees, although most molecular-based estimates of their relative importance suggest that pollen is the dominant component of intra-specific gene flow, being most likely the common source of rare, long-distance dispersal events [5], [7], [8]. This is particularly the case in many temperate genera such as the wind-pollinated Pinus [9], [10] (but see [11]), Quercus [12] and Populus [13], as well as the animal-pollinated genera such as Eucalyptus [14], [15], [16]. However, while rare long-distance pollen dispersal has been reported from early life-history stages, and may be an important source of novel genes, dispersal may not correspond to realised gene flow [5], [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Heterosis May Result in Selection Favouring the Products of Long-Distance Pollen Dispersal in Eucalyptus

2014

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Using native trees from near the northern and southern extremities of the relatively continuous eastern distribution of Eucalyptus globulus in Tasmania, we compared the progenies derived from natural open-pollination (OP) with those generated from within-region and long-distance outcrossing. Controlled outcrossing amongst eight parents - with four parents from each of the northern and southern regions - was undertaken using a diallel mating scheme. The progeny were planted in two field trials located within the species native range in southern Tasmania, and their survival and diameter growth were monitored over a 13-year-period. The survival and growth performances of all controlled cross types exceeded those of the OP progenies, consistent with inbreeding depression due to a combination of selfing and bi-parental inbreeding. The poorer survival of the northern regional (♀N♂N) outcrosses compared with the local southern regional outcrosses (♀S♂S) indicated differential selection against the former. Despite this mal-adaptation of the non-local ♀N♂N crosses at both southern sites, the survival of the inter-regional hybrids (♀N♂S and ♀S♂N) was never significantly different from that of the local ♀S♂S crosses. Significant site-dependent heterosis was detected for the growth of the surviving long-distance hybrids. This was expressed as mid-parent heterosis, particularly at the more northern planting site. Heterosis increased with age, while the difference between the regional ♀N♂N and ♀S♂S crosses remained insignificant at any age at either site. Nevertheless, the results for growth suggest that the fitness of individuals derived from long-distance crossing may be better at the more northern of the planting sites. Our results demonstrate the potential for early-age assessments of pollen dispersal to underestimate realised gene flow, with local inbreeding under natural open-pollination resulting in selection favouring the products of longer-distance pollinations. Indeed, heterosis derived from long-distance pollinations may be sufficient to counter local mal-adaptation, at least in the first generation.

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“…Genetic diversity in the population indicates that the interpretation of the bak-kala is more influenced by the variation within the population (Figure 3). This suggests that sufficient donors provide the emergence of new alleles in the population to give rise to high diversity (Ozawa et al, 2013).…”

Section: Issr Polymorphismmentioning

confidence: 99%

Genetic Diversity of Bak-Kala (Etlingera Elatior (Jack) R.M. Sm.) in Aceh Province, Indonesia

SAUDAH¹,

ZUMAIDAR²,

DARUSMAN³

et al. 2022

SABRAOJBG

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Torch ginger – bak-kala (Etlingera elatior (Jack) R.M.SM.) already has been proven an effective traditional medicine by tribes in Aceh Province, Indonesia. Solid primary evidence for the torch ginger, bak-kala’s medicinal properties include the healing effects experienced by the traditional tribes in Aceh, when treated for illnesses, such as, cough, fever, and sprains. Likewise, it has been proven to be a use for food ingredients, i.e., vegetables and spices to enhance the taste of food. Much of the available documented information focused on its biochemical and pharmacological aspects. Even though the utilization of bak-kala resources is mainly at the level of diversity, there is no information on its genetic diversity in Aceh. The high intensity of bak-kala utilization is not simultaneous with information on its genetic diversity. On the other hand, many uses of bak-kala are specific for certain accessions with particular benefits. The study aimed to create a classification system for bak-kala variations based on inter-simple sequence repeats (ISSR) markers and to provide information on the genetic diversity of bak-kala in Aceh Province. The 35 accessions were divided into eight populations based on the geographical locations from which they were collected. Data were recorded and analyzed using 10 ISSR primers with 77 total bands. The molecular characters divided the accessions into four major groups. As revealed by expected heterozygosity (He), genetic variability among the population showed that the Simeulu population possessed a greater level of variability than other populations. The results of the analysis of molecular variation (AMOVA) showed that the genetic variation within the population was higher (60%) than the genetic variation among populations (40%). The studies can be used to plan conservation strategies, optimal utilization of the species, and crop improvement programs in the future.

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Influence of Long-Distance Seed Dispersal on the Genetic Diversity of Seed Rain in Fragmented Pinus densiflora Populations Relative to Pollen-Mediated Gene Flow

Cited by 9 publications

References 74 publications

Habitat loss and fragmentation reduce effective gene flow by disrupting seed dispersal in a neotropical palm

Habitat loss and fragmentation reduce effective gene flow by disrupting seed dispersal in a neotropical palm

Heterosis May Result in Selection Favouring the Products of Long-Distance Pollen Dispersal in Eucalyptus

Genetic Diversity of Bak-Kala (Etlingera Elatior (Jack) R.M. Sm.) in Aceh Province, Indonesia

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