Ovule Discounting in an Outcrossing, Cryptically Dioecious Tree

Verdú, Miguel; González‐Martínez, Santiago C.; Montilla, Ana I.; Mateu, Isabel; Pannell, John R.

doi:10.1554/06-236.1

Cited by 16 publications

(20 citation statements)

References 63 publications

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“…Total DNA was manually extracted using a modified cetyltrimethyl ammonium bromide (CTAB) method (Lian et al 2003). Nine nuclear microsatellite loci specific to Fraxinus species were examined in this study: fm04, fm06, fm13 and fm14 (Goto et al unpublished), FEMSATL4, FEMSATL16, FEMSATL19 (Lefort et al 1999), FR16 (Verdú et al 2006) and M2-30 ). Due to different PCR conditions, the nine loci were classified into two mixture groups: G1 (comprising fm04, fm06, fm13, fm14 and FR16) and G2 (comprising FEMSATL4, FEMSATL16, FEMSATL19 and M2-30).…”

Section: Dna Extraction and Genotypingmentioning

confidence: 99%

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Uchiyama

Shen

et al. 2009

Conserv Genet

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Landscape genetics increasingly focuses on the way in which landscape features cause the fragmentation of lineages of terrestrial organisms. However, landscape features can also provide functional connectivity or corridors, enhancing the dispersal of plant populations, particularly the case in riparian habitat. Unfortunately, recent research in tree genetics has paid little attention to this role. To examine the possible effects of landscape connectivity on the current population genetic distribution of Fraxinus mandshurica and to provide insights into conserving the local genetic diversity for this endangered tree species, we used nine nuclear microsatellite loci to examine the spatial genetic structure of F. mandshurica at multiple-scales over a riparian-mountain landscape in Northeast China. F-statistics indicated that the magnitude of among-population genetic differentiation was significantly higher between the riparian and mountain habitats than within the riparian habitat. Spatial analysis of molecular variance and principal coordinate analysis consistently revealed that this species exhibited a clear landscape genetic structure between the riparian and mountain habitats, despite no significant isolation by distance pattern being identified by the Mantel test. Spatial autocorrelation analysis further demonstrated significant, positive fine-scale spatial genetic structure among individuals over short distances (\80 m) in each mountain population. Conversely, no spatial genetic structures were identified within and among the riparian populations. Overall, the results suggest that seed dispersal is very low among mountain populations; however seed transport is probably enhanced by a secondary phase of hydrochory (water-dispersal) among riparian populations during flooding. Despite this, there was no significant accumulation of genetic diversity in downstream populations along the main channel. This result suggests that hydrochory is not sufficient to produce a clear unidirectional gene flow along the water course, although it may impede the development of spatial genetic structuring within and among riparian populations.

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Section: Dna Extraction and Genotypingmentioning

confidence: 99%

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Uchiyama

Shen

et al. 2009

Conserv Genet

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“…For instance, correlated paternity (that is, the proportion of full sibs within maternal progeny arrays), when combined with restricted dispersal, may enhance fine-scale genetic structure, kin competition and, ultimately, levels of biparental inbreeding (that is, mating among relatives) and inbreeding depression in subsequent generations (for example, Griffin and Eckert, 2003;Degen et al, 2004). Moreover, correlated paternity estimates can provide powerful insights into pollination biology (for example, Hardy et al, 2004;Verdú et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…At the stand and population level, mating patterns are affected by natural factors such as population density and size, mode of pollination, flowering synchrony and phenological patterns (El-Kassaby and Jaquish, 1996;Robledo-Arnuncio et al, 2004a;Gérard et al, 2006;O'Connell et al, 2006), as well as management and silvicultural practices (Murawski et al, 1994;El-Kassaby et al, 2003). At the individual level, plant size and shape (in particular crown shape in trees), gender expression, male and female reproductive effort and within-stand social position can also affect mating patterns (Burczyk et al, 1996(Burczyk et al, , 2002Dow and Ashley, 1998;O'Connell et al, 2004;García et al, 2005;Verdú et al, 2006). Forest trees typically have a low level of domestication, and management strategies in forest tree breeding programs, in situ conservation units or ex situ conservation plantations often rely on open pollination.…”

Section: Introductionmentioning

confidence: 99%

Mating system and pollen gene flow in Mediterranean maritime pine

et al. 2008

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Mating systems define the mode of gene transmission across generations, helping to determine the amount and distribution of genetic variation within and among populations of plant species. A hierarchical analysis of Mediterranean maritime pine mating system (61 mother trees from 24 plots, clustered in three populations) was used to identify factors affecting mating patterns and to fit pollen dispersal kernels. Levels of ovule and seed abortion, multi-and single-locus outcrossing rates and correlated paternity were estimated from progeny arrays and correlated with ecological stand variables and biometric tree measures. Pollen dispersal kernels were fitted using TwoGener and KinDist indirect methods and simulations were carried out to identify relevant factors affecting correlated paternity. Maritime pine showed high outcrossing rates (t m and t s B0.96) and relatively low levels of correlated paternity [an r p of 0.018 (Ritland's estimate) or 0.048 (Hardy's estimate)], although higher than in other anemophilous tree species. Mating system parameters had high variation at the single-tree level (99-100%) but no stand or population effect was detected. At the single-tree level, outcrossing rates were correlated with tree (diameter and height) and crown size. In addition, correlated paternity showed a significant negative correlation with tree height, height to crown base and height to the largest crown width, probably reflecting the importance of the trees' 'ecological neighborhoods'. Indirectly estimated pollen dispersal kernels were very leptokurtic (exponential-power distributions with b50.5), with mean dispersal distances from 78.4 to 174.4 m. Fitted dispersal kernels will be useful in building explicit simulation models that include dispersal functions, and which will contribute to current conservation and management programs for maritime pine. Nevertheless, the numerical simulations showed that restricted dispersal, male fertility and phenological overlap could only partially explain the observed levels of correlated paternity; so other factors may also be relevant for the management of this valuable forest tree species.

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“…Fraxinus ornus (Oleaceae), also known Manna ash (Fraxigen 2005), is an insect-pollinated tree (Verdú et al 2006). F. ornus fruits are elongated, winged, single-seeded samaras that are borne in panicles (Bonner 2002).…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature on the germination of Fraxinus ornus subsp. cilicica seeds

Yilmaz¹,

Tonguç²

2012

Dendrobiology

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The present study was carried out to determine the effect of temperature on the seed germination of Fraxinus ornus subsp. cilicica, an endemic taxa on Taurus Mountains in Southern Turkey. Seeds from the three provenances were collected and prechilled for 16 weeks before the germination tests. Germination tests were conducted at constant temperatures (5, 15, 20, 25°C) and at alternating temperatures (5~15, 5~20, 5~25, 15~25°C). Temperature treatments were effective on germination percentage and mean germination time. The highest and the lowest germinability were obtained at the 5-15°C (73.3%) alternating and 25°C (9.8%) constant temperatures, respectively. Mean germination time greatly differed at various temperature regimes. Germination accelerated with increased constant temperatures while it was relatively similar speed at alternating temperatures used in the tests. Seed sources had also an effect on the final germination percentage.

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Ovule Discounting in an Outcrossing, Cryptically Dioecious Tree

Cited by 16 publications

References 63 publications

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Multiple-scaled spatial genetic structures of Fraxinus mandshurica over a riparian–mountain landscape in Northeast China

Mating system and pollen gene flow in Mediterranean maritime pine

Effects of temperature on the germination of Fraxinus ornus subsp. cilicica seeds

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