Mating system patterns of natural populations of Pinus koraiensis along its post-glacial colonization route in northeastern China

Mating system parameters were estimated in two Italian natural populations of European beech (Fagussylvatica L.) using a mixed mating model and considering seven allozyme loci (Idh-A, Lap-A, Mdh-B, Pgd-A, Pgd-B, Pgd-C, Skd-A). High values of multilocus estimates of the outcrossing rate were found in both populations, ranging from 94 to 98%. Comparison of single- and multi-locus estimates of outcrossing rates seems to indicate the presence of consanguineous matings, probably because the populations are substructured. This hypothesis seems to be confirmed by the presence of a heterogeneity of the pollen allele frequencies across female parent trees and by the significant coefficient of the regression of pollen allele frequencies on ovule genotype. Variation in the fixation indices in different life-cycle phases was observed, indicating possible presence of selective processes between seed set and sexual maturity. Possible explanations of these results are presented.

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The number and distribution of incompatibility factors in natural populations of Pleurotus ostreatus and Pleurotus sapidus

Canadian Journal of Botany ◽

10.1139/b91-274 ◽

1991 ◽

Vol 69 (10) ◽

pp. 2187-2191 ◽

Cited By ~ 5

Author(s):

Neil A. Anderson ◽

Glenn R. Furnier ◽

Andrew S. Wang ◽

John W. Schwandt

Keyword(s):

Population Genetics ◽

Mating System ◽

Key Words ◽

Pleurotus Ostreatus ◽

Small Area ◽

Spatial Clustering ◽

Natural Populations ◽

Single Spore ◽

Single Tree ◽

Pleurotus Sapidus

Pairings of single-spore isolates from different basidiocarps were made to examine the numbers and distributions of incompatibility factors in the tetrapolar basidiomycetes Pleurotus ostreatus and Pleurotus sapidus. These factors do not appear to be randomly distributed, with multiple basidiocarps on a single tree or log arising from a single mycelium, multiple basidiocarps on a single tree or log sharing a single common monokaryotic parent, and a tendency toward spatial clustering of factors even when multiple basidiocarps from the same tree or log are excluded from the analyses. For one 30-km2 collection area, the estimated numbers of A and B factors in the P. ostreatus population were 126 and 354, respectively, yielding an estimated outbreeding efficiency of 0.99. Estimated outbreeding efficiencies were quite high [Formula: see text] even in a sample taken from a very small area (0.09 m2), illustrating the ability of the tetrapolar mating system to simultaneously prevent self mating and minimize the number of incompatible matings. Key words: Basidiomycotina, fungi, mating system, population genetics.

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Mating system and female reproductive success of the endemic, epiphytic Prosthechea aff. karwinskii (Orchidaceae)

Lankesteriana ◽

10.15517/lank.v11i3.18300 ◽

2011 ◽

Vol 11 (3) ◽

Author(s):

Ericka Camacho-Domínguez ◽

Irene Ávila-Díaz

Keyword(s):

Reproductive Success ◽

Mating System ◽

Sexual Reproduction ◽

Fruit Set ◽

Natural Populations ◽

Fruit Production ◽

Open Pollination ◽

Female Reproductive Success ◽

Hand Pollination ◽

Northern Portion

Prosthechea aff. karwinskii (Mart.) Soto Arenas & Salazar (unpublished name) is an endemic Mexican epiphytic orchid with a restricted distribution. It occurs in deciduous oak forests, particularly on Quercus deserticola in the northern portion of Michoacán state. Due to their ornamental uses, this and other orchid species have been heavily collected from their natural populations. Learning about the reproductive biology of this species is important, as we may gain knowledge about the probable repercussions of overcollecting on their genetics and ecology. This will be a useful tool for the management and conservation of the species. The objectives were to 1) study the mating system of P. aff. karwinskii, 2) determine if the species requires an external pollinating agent for sexual reproduction, and 3) evaluate female reproductive success of this species. Exclusions (150) were made before anthesis. Once the flowers opened, we applied four pollination treatments: manual selfing, outcrossing, spontaneous autogamy, and open pollination. We subsequently quantified the production of fruits and viability of the seeds. Preliminary results showed that outcrossing and selfing treatments exhibited statistically higher fruit set than spontaneous autogamy and open pollination treatments, meaning that P. aff. karwinskii has the capability to reproduce via self-pollination. Prosthechea aff. karwinskii is pollinator-dependent for sexual reproduction, taking into account that the spontaneous autogamy treatment showed nil fruit production. Female reproductive success in open pollinated flowers was lower compared to fruit set of hand pollination treatments. This indicates that this species, as other species of tropical orchids, is pollination-limited.

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Reproductive Ecology of Male and Female Strobili and Mating System in Two Different Populations ofPinus roxburghii

The Scientific World JOURNAL ◽

10.1100/2012/271389 ◽

2012 ◽

Vol 2012 ◽

pp. 1-13 ◽

Cited By ~ 6

Author(s):

Chandra Mohan Sharma ◽

Vinod Prasad Khanduri ◽

Sunil Kumar Ghildiyal

Keyword(s):

Mating System ◽

Natural Populations ◽

Production Capacity ◽

Pollen Grains ◽

Seed Orchard ◽

Reproductive Period ◽

Female Cone ◽

Lower Altitude ◽

Female Ratio ◽

Male And Female

We studied several flowering traits, namely, male-female cone phenology, male-female cone production per tree, mating system, sex ratio, air-borne pollen grains and pollen migration, over four successive years in two different natural populations ofP. roxburghiifrom Garhwal Himalaya, India. Assessment of each trait mentioned except pollen dispersion was done by selecting five representative trees randomly in each population. The pollen migration was studied on naturally isolated source trees. The pollen trapping was done in all directions up to 2.5 km. The average reproductive period inP. roxburghiiwas 36 days with 3–5 days protandry. There were significant year and population effects for male and female cone output and pollen grains production per tree. In mass production year (1999), an average production of pollen cone per tree was estimated as42.44±8.32×103at lower altitude and28.1±0.89×103at higher altitude. The controlled pollination results in high level of outcrossing with 90% seed setting. We conclude that the high male-female ratio and tremendous pollen production capacity inP. roxburghiiindicate high male competition among trees within populations. The isolation strip of 600 m is considered minimal for the management of seed orchard.

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Life cycle expression of inbreeding depression in Eucalyptus regnans and inter-generational stability of its mixed mating system

Annals of Botany ◽

10.1093/aob/mcz059 ◽

2019 ◽

Vol 124 (1) ◽

pp. 179-187 ◽

Cited By ~ 3

Author(s):

A Rod Griffin ◽

Brad M Potts ◽

René E Vaillancourt ◽

J Charles Bell

Keyword(s):

Life Cycle ◽

Mating System ◽

Inbreeding Depression ◽

Field Experiments ◽

Natural Populations ◽

Forest Tree ◽

Mixed Mating ◽

Mature Trees ◽

Mixed Mating System ◽

Eucalyptus Regnans

Abstract Background and Aims Many plants exhibit a mixed mating system. Published models suggest that this might be an evolutionarily stable rather than a transitional state despite the presence of inbreeding depression, but there is little empirical evidence. Through field experimentation, we studied the role of inbreeding depression in eliminating inbred progeny from the reproductive cohort of the forest tree Eucalyptus regnans, and demonstrate a stable mixed primary mating system over two successive generations. Methods Two field experiments were conducted using seed from natural populations. We sowed open-pollinated seeds to simulate a natural regeneration event and determined isozyme genotypes of dominant and suppressed individuals over 10 years. We also planted a mixture of open-pollinated, outcross and selfed families with common maternal parentage; monitored survival of cross types over 29 years; and determined the percentage of outcrosses in open-pollinated seed from a sample of reproductively mature trees using microsatellite analysis. Key Results Both experiments demonstrated progressive competitive elimination of inbred plants. By 29 years, the reproductive cohort in the planted experiment consisted only of outcrosses which produced seed which averaged 66 % outcrosses, similar to the estimate for the parental natural population (74 %). Conclusions Selective elimination of inbred genotypes during the intense intra-specific competition characteristic of the pre-reproductive phase of the life cycle of E. regnans results in a fully outcrossed reproductive population, in which self-fertility is comparable with that of its parental generation. The mixed mating system may be viewed as an unavoidable consequence of the species’ reproductive ecology, which includes the demonstrated effects of inbreeding depression, rather than a strategy which is actively favoured by natural selection.

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Mating System and Genetic Structure of Natural Populations in Wild Rice Oryza rufipogon*

Plant Species Biology ◽

10.1111/j.1442-1984.1990.tb00190.x ◽

1990 ◽

Vol 5 (1) ◽

pp. 31-39 ◽

Cited By ~ 30

Author(s):

Hiroko Morishima ◽

Pascale Barbier

Keyword(s):

Genetic Structure ◽

Mating System ◽

Wild Rice ◽

Natural Populations ◽

Oryza Rufipogon

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Quantitative measure of sexual selection with respect to the operational sex ratio: a comparison of selection indices

Proceedings of The Royal Society B Biological Sciences ◽

10.1098/rspb.2006.3639 ◽

2006 ◽

Vol 274 (1606) ◽

pp. 143-150 ◽

Cited By ~ 84

Author(s):

Suzanne C Mills ◽

Alessandro Grapputo ◽

Esa Koskela ◽

Tapio Mappes

Keyword(s):

Sexual Selection ◽

Mating System ◽

Selection Index ◽

Natural Populations ◽

Quantitative Measure ◽

Clethrionomys Glareolus ◽

Operational Sex Ratio ◽

Plasma Testosterone ◽

Bank Voles ◽

Selection Indices

Despite numerous indices proposed to predict the evolution of mating systems, a unified measure of sexual selection has remained elusive. Three previous studies have compared indices of sexual selection under laboratory conditions. Here, we use a genetic study to compare the most widely used measures of sexual selection in natural populations. We explored the mating and reproductive successes of male and female bank voles, Clethrionomys glareolus , across manipulated operational sex ratios (OSRs) by genotyping all adult and pup bank voles on 13 islands using six microsatellite loci. We used Bateman's principles ( I s and I and Bateman gradients) and selection coefficients ( s ′ and β ′) to evaluate, for the first time, the genetic mating system of bank voles and compared these measures with alternative indices of sexual selection (index of monopolization and Morisita's index) across the OSRs. We found that all the sexual selection indices show significant positive intercorrelations for both males and females, suggesting that Bateman's principles are an accurate and a valid measure of the mating system. The Bateman gradient, in particular, provides information over and above that of other sexual selection indices. Male bank voles show a greater potential for sexual selection than females, and Bateman gradients indicate a polygynandrous mating system. Selection coefficients reveal strong selection gradients on male bank vole plasma testosterone level rather than body size.

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The significance of sexual dimorphism in the mating system of two species of tephritid flies (Aciurina trixa and Valentibulla dodsoni) (Diptera: Tephritidae)

Canadian Journal of Zoology ◽

10.1139/z87-028 ◽

1987 ◽

Vol 65 (1) ◽

pp. 194-198 ◽

Cited By ~ 6

Author(s):

Gary Dodson

Keyword(s):

Sexual Dimorphism ◽

Mating System ◽

Mating Systems ◽

Natural Populations ◽

Adaptive Significance ◽

Male Behavior ◽

Field Cage ◽

Copulatory Success

The mating systems of Aciurina trixa and Valentibulla dodsoni (Diptera: Tephritidae) were observed in natural populations and field cage studies. Measurements of field-collected individuals of both species revealed that females were larger than males based on five size categories, but males had larger forefemora. Male behavior suggested that selection might favor increased foreleg size, due to a resulting enhancement of male ability to seize females prior to mounting. Male forefemur size was found to be a predictor of copulatory success in both species. Hypotheses concerning the adaptive significance of this sexual dimorphism are discussed.

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