Density-dependent selfing and its effects on seed performance in a tropical canopy tree species, Shorea acuminata (Dipterocarpaceae)

Naito, Yoko; Kanzaki, Mamoru; Iwata, Hiroyoshi; Obayashi, Kyoko; Lee, Soon Leong; Muhammad, Norwati; Okuda, Toshinori; Tsumura, Yoshihiko

doi:10.1016/j.foreco.2008.04.031

Cited by 78 publications

(64 citation statements)

References 41 publications

(68 reference statements)

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“…This pattern of pollen dispersal has been observed in many other animal-pollinated tropical tree species (Hoebee et al, 2007;Lourmas et al, 2007;Lacerda et al, 2008;Naito et al, 2008) and may be explained by the pollinator behaviour (bees) and flowering density. Some bee species are expected to forage between near neighbours (Dick et al, 2008), which can increase the frequency of short-distance pollen dispersal.…”

Section: Pollen Dispersal Distancesupporting

confidence: 60%

Low levels of realized seed and pollen gene flow and strong spatial genetic structure in a small, isolated and fragmented population of the tropical tree Copaifera langsdorffii Desf

et al. 2010

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Over the past century, the Brazilian Atlantic forest has been reduced to small, isolated fragments of forest. Reproductive isolation theories predict a loss of genetic diversity and increases in inbreeding and spatial genetic structure (SGS) in such populations. We analysed eight microsatellite loci to investigate the pollen and seed dispersal patterns, genetic diversity, inbreeding and SGS of the tropical tree Copaifera langsdorffii in a small (4.8 ha), isolated population. All 112 adult trees and 128 seedlings found in the stand were sampled, mapped and genotyped. Seedlings had significantly lower levels of genetic diversity (A ¼ 16.5 ± 0.45, mean±95% s.e.; H e ¼ 0.838±0.006) than did adult trees (A ¼ 23.2±0.81; H e ¼ 0.893±0.030). Parentage analysis did not indicate any seed immigration (m seeds ¼ 0) and the pollen immigration rate was very low (m pollen ¼ 0.047). The average distance of realized pollen dispersal within the stand was 94 m, with 81% of the pollen travelling o150 m. A significant negative correlation was found between the frequency and distance of pollen dispersal (r ¼ À0.79, Po0.01), indicating that short-distance pollinations were more frequent. A significant SGS for both adults (B50 m) and seedlings (B20 m) was also found, indicating that most of the seeds were dispersed over short distances. The results suggested that the spatial isolation of populations by habitat fragmentation can restrict seed and pollen gene flow, increase SGS and affect the genetic diversity of future generations.

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Section: Pollen Dispersal Distancesupporting

confidence: 60%

Low levels of realized seed and pollen gene flow and strong spatial genetic structure in a small, isolated and fragmented population of the tropical tree Copaifera langsdorffii Desf

et al. 2010

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“…In self-compatible species with a mixed mating system, outcrossing rates tend to increase over life-stages because of late-acting selfincompatibility or inbreeding depression (Hufford and Hamrick, 2003;Naito et al, 2005;Ward et al, 2005;Ishida, 2006;Isagi et al, 2007;Naito et al, 2008;Hasegawa et al, 2009;Tamaki et al, 2009;Philipp and Nielsen, 2010;Kamm et al, 2011), that is, that offspring stemming from self-fertilization will experience reduced fitness. In obligate outcrossing species, biparental inbreeding (that is, mating of two genetically related individuals), might also reduce offspring viability and quality (Nason and Ellstrand, 1995;Teixeira et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Molecular and quantitative signatures of biparental inbreeding depression in the self-incompatible tree species Prunus avium

2012

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Genetic diversity strongly influences populations' adaptability to changing environments and therefore survival. Sustainable forest management practices have multiple roles including conservation of genetic resources and timber production. In this study, we aimed at better understanding the variation in genetic diversity among adult and offspring individuals, and the effects of mating system on offspring survival and growth in wild cherry, Prunus avium. We analysed adult trees and open pollinated seed-families from three stands in Germany at eight microsatellite loci and one incompatibility system locus and conducted paternity analyses. Seed viability testing and seed sowing in a nursery allowed further testing for the effects of pollen donor diversity and genetic similarity between mates on the offspring performance at the seed and seedling stages. Our results were contrasting across stands. Loss of genetic diversity from adult to seedling stages and positive effect of mate diversity on offspring performance occurred in one stand only, whereas biparental inbreeding depression and significant decrease in fixation index from adults to seedlings was detected in two stands. We discussed the effects of stand genetic diversity on the magnitude of biparental inbreeding depression at several life-stages and its consequences on the management of genetic resources in P. avium.

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“…If seeds are produced by consanguineous matings in allogamous plants, inbreeding depression may be manifested at many subsequent developmental stages, such as fruit maturation (Nagamitsu et al 2001;Naito et al 2005Naito et al , 2008, germination (Naito et al 2005(Naito et al , 2008, seedling growth , or sapling development. Dipterocarps are predominantly outcrossing species, so inbreeding depression may be expected only in selfed seeds.…”

Section: Inbreeding Depressionmentioning

confidence: 99%

Gene Flow, Mating Systems, and Inbreeding Depression in Natural Populations of Tropical Trees

Tsumura

2011

Advances in Asian Human-Environmental Research

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I have summarized and reviewed the data on mating system and gene flow of tropical tree species, especially dipterocarps. These are major canopy trees and important for forestry and ecosystem function in Southeast Asia. Microsatellite markers have been developed in many species of the Dipterocarpaceae to clarify the mating system, gene flow, and genetic structure. Dipterocarp species are a predominantly outcrossed species but the outcrossing rate is strongly influenced by the density of flowering tree, flowering phenology, and pollinator behavior. The pollen dispersal patterns of dipterocarp species were affected by differences in conspecific tree flowering density. Reductions in conspecific tree flowering density led to an increase in the selfing rate. In dipterocarp species, inbreeding depression can occur at all stages of development, including seed formation, seed germination, seedling growth, and sapling establishment. Genetic information discussed in this chapter may provide a more promising direction for conservation of natural forest and developing sustainable forestry.

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Density-dependent selfing and its effects on seed performance in a tropical canopy tree species, Shorea acuminata (Dipterocarpaceae)

Cited by 78 publications

References 41 publications

Low levels of realized seed and pollen gene flow and strong spatial genetic structure in a small, isolated and fragmented population of the tropical tree Copaifera langsdorffii Desf

Low levels of realized seed and pollen gene flow and strong spatial genetic structure in a small, isolated and fragmented population of the tropical tree Copaifera langsdorffii Desf

Molecular and quantitative signatures of biparental inbreeding depression in the self-incompatible tree species Prunus avium

Gene Flow, Mating Systems, and Inbreeding Depression in Natural Populations of Tropical Trees

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