scholarly journals Effects of wildfire on floral display size and pollinator community reduce outcrossing rate in a plant with a mixed mating system

2018 ◽  
Vol 105 (7) ◽  
pp. 1154-1164 ◽  
Author(s):  
Eric F. LoPresti ◽  
Jennifer I. Van Wyk ◽  
John M. Mola ◽  
Katherine Toll ◽  
Timothy J. Miller ◽  
...  
Keyword(s):  
Mating System ◽  
Display Size ◽  
Outcrossing Rate ◽  
Mixed Mating ◽  
Floral Display ◽  
Mixed Mating System ◽  
Pollinator Community ◽  
Floral Display Size

IMPACT OF INSECT POLLINATOR GROUP AND FLORAL DISPLAY SIZE ON OUTCROSSING RATE

Evolution ◽  
2006 ◽  
Vol 60 (2) ◽  
pp. 234-246 ◽  
Author(s):  
Johanne Brunet ◽  
Heather R. Sweet
Keyword(s):  
Display Size ◽  
Outcrossing Rate ◽  
Floral Display ◽  
Insect Pollinator ◽  
Floral Display Size

IMPACT OF INSECT POLLINATOR GROUP AND FLORAL DISPLAY SIZE ON OUTCROSSING RATE

Evolution ◽  
2006 ◽  
Vol 60 (2) ◽  
pp. 234 ◽  
Author(s):  
Johanne Brunet ◽  
Heather R. Sweet
Keyword(s):  
Display Size ◽  
Outcrossing Rate ◽  
Floral Display ◽  
Insect Pollinator ◽  
Floral Display Size

Mating system of Calluna vulgaris: self-sterility and outcrossing estimations

1998 ◽  
Vol 76 (1) ◽  
pp. 37-42 ◽  
Author(s):  
Grégory Mahy ◽  
Anne-Laure Jacquemart
Keyword(s):  
Mating System ◽  
Inbreeding Depression ◽  
Calluna Vulgaris ◽  
Pollen Tubes ◽  
Outcrossing Rate ◽  
Evolutionary Significance ◽  
Mixed Mating ◽  
Mixed Mating System ◽  
Cross Pollination ◽  
Mating System Evolution

The evolutionary significance of a mixed mating system is currently under debate. Calluna vulgaris (L). Hull, a widespread European shrub, is likely to undergo mixed mating because of geitonogamy. Mating system was investigated in three populations of C. vulgaris by means of greenhouse controlled crosses, pollen tube observations, and outcrossing rate estimations from allozyme markers. The species is highly self-sterile, most probably as a result of early inbreeding depression. Mean fruit set and mean seed number per fruit following hand self-pollination were 48 and 13%, respectively, of those following cross-pollination. Pollen tubes produced by self pollen penetrated the ovary with the same success as those from cross-pollination. Multilocus estimates of the outcrossing rates ranged from 0.71 to 0.90, and two estimates were significantly different from 1.00. Calluna vulgaris could thus be classified as being mixed mating with predominant allogamy. Single-locus estimates did not differ significantly from multilocus estimates suggesting that biparental inbreeding did not contribute to the apparent selfing rate. The maintenance of high early inbreeding depression despite an intermediate level of selfing is discussed with respect to recent theories on mating system evolution. Key words: Calluna vulgaris, mating system, self-sterility, pollen tubes, outcrossing rate, inbreeding depression.

scholarly journals Inferring mating system parameters in forage peanut, Arachis pintoi, for Brazilian Amazon conditions

2019 ◽  
Vol 49 (4) ◽  
pp. 277-282 ◽  
Author(s):  
Jônatas Chagas de OLIVEIRA ◽  
Polinar Bandeira RUFINO ◽  
Hellen Sandra Freires da Silva AZÊVEDO ◽  
Adna Cristina Barbosa de SOUSA ◽  
Giselle Mariano Lessa de ASSIS ◽  
...  
Keyword(s):  
Mating System ◽  
Brazilian Amazon ◽  
Outcrossing Rate ◽  
Fixation Index ◽  
Mixed Mating ◽  
Mixed Mating System ◽  
Arachis Pintoi ◽  
Environmental Variations ◽  
Increase Productivity ◽  
New Cultivars

ABSTRACT The search for alternatives to increase productivity and sustainability of livestock production in the Amazon region without increasing deforestation is challenging. Mixed pastures of grasses with forage peanut (Arachis pintoi) have shown positive economic impacts. However, gaps in the knowledge of the reproductive biology of A. pintoi have limited the development of new cultivars adapted to the environmental variations in the Brazilian Amazon. Pasture consortiums of Brachiaria humidicola with forage peanuts (cv. Mandobi) resulted in a 42% increase in weight gain productivity. New cultivars better adapted to the Amazon climate should bring even greater gains. We evaluated the mating system in twenty A. pintoi accessions, and approximately 40 offspring per accession genotyped with eight microsatellites (or markers). The parameters of genetic diversity and inbreeding, the outcrossing rate and coancestry were calculated. The observed heterozygosity was significantly higher and the fixation index was significantly lower in adults compared with the offspring. The crossing rate was variable among genotypes (2 to 80%), and the mean outcrossing rate was 36%. These results indicate that pollinator presence in pastures can influence gene flow in A. pintoi more than expected. Arachis pintoi presented a mixed mating system with a predominance of selfing, and families presented inbreeding and different levels of relatedness. New strategies of genotype conservation are needed to avoid pollinator-mediated crossing between accessions.

scholarly journals Life history and past demography maintain genetic structure, outcrossing rate, contemporary pollen gene flow of an understory herb in a highly fragmented rainforest

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e2764 ◽  
Author(s):  
Pilar Suárez-Montes ◽  
Mariana Chávez-Pesqueira ◽  
Juan Núñez-Farfán
Keyword(s):  
Genetic Diversity ◽  
Genetic Structure ◽  
Habitat Fragmentation ◽  
Mating System ◽  
Population Expansion ◽  
Outcrossing Rate ◽  
Mixed Mating ◽  
Long Distance ◽  
Mixed Mating System ◽  
Genetic Structure Of Populations

IntroductionTheory predicts that habitat fragmentation, by reducing population size and increasing isolation among remnant populations, can alter their genetic diversity and structure. A cascade of effects is expected: genetic drift and inbreeding after a population bottleneck, changes in biotic interactions that may affect, as in the case of plants, pollen dynamics, mating system, reproductive success. The detection of the effects of contemporary habitat fragmentation on the genetic structure of populations are conditioned by the magnitude of change, given the few number of generations since the onset of fragmentation, especially for long-lived organisms. However, the present-day genetic structure of populations may bear the signature of past demography events. Here, we examine the effects of rainforest fragmentation on the genetic diversity, population structure, mating system (outcrossing rate), indirect gene flow and contemporary pollen dynamics in the understory herbAphelandra aurantiaca. Also, we assessed its present-day genetic structure under different past demographic scenarios.MethodsTwelve populations ofA. aurantiacawere sampled in large (4), medium (3), and small (5) forest fragments in the lowland tropical rainforest at Los Tuxtlas region. Variation at 11 microsatellite loci was assessed in 28–30 reproductive plants per population. In two medium- and two large-size fragments we estimated the density of reproductive plants, and the mating system by analyzing the progeny of different mother plants per population.ResultsDespite prevailing habitat fragmentation, populations ofA. aurantiacapossess high genetic variation (He = 0.61), weak genetic structure (Rst = 0.037), and slight inbreeding in small fragments. Effective population sizes (Ne) were large, but slightly lower in small fragments. Migrants derive mostly from large and medium size fragments. Gene dispersal is highly restricted but long distance gene dispersal events were detected.Aphelandra aurantiacashows a mixed mating system (tm = 0.81) and the outcrossing rate have not been affected by habitat fragmentation. A strong pollen pool structure was detected due to few effective pollen donors (Nep) and low distance pollen movement, pointing that most plants received pollen from close neighbors. Past demographic fluctuations may have affected the present population genetic structure as Bayesian coalescent analysis revealed the signature of past population expansion, possibly during warmer conditions after the last glacial maximum.DiscussionHabitat fragmentation has not increased genetic differentiation or reduced genetic diversity ofA. aurantiacadespite dozens of generations since the onset of fragmentation in the region of Los Tuxtlas. Instead, past population expansion is compatible with the lack of observed genetic structure. The predicted negative effects of rainforest fragmentation on genetic diversity and population structure ofA. aurantiacaseem to have been buffered owing to its large effective populations and long-distance dispersal events. In particular, its mixed-mating system, mostly of outcrossing, suggests high efficiency of pollinators promoting connectivity and reducing inbreeding. However, some results point that the effects of fragmentation are underway, as two small fragments showed higher membership probabilities to their population of origin, suggesting genetic isolation. Our findings underscore the importance of fragment size to maintain genetic connectivity across the landscape.

scholarly journals Mixed Mating System Are Regulated by Fecundity in Shorea curtisii (Dipterocarpaceae) as Revealed by Comparison under Different Pollen Limited Conditions

PLoS ONE ◽  
2015 ◽  
Vol 10 (5) ◽  
pp. e0123445 ◽  
Author(s):  
Naoki Tani ◽  
Yoshihiko Tsumura ◽  
Keita Fukasawa ◽  
Tomoyuki Kado ◽  
Yuriko Taguchi ◽  
...  
Keyword(s):  
Mating System ◽  
Mixed Mating ◽  
Mixed Mating System

scholarly journals Wild sorghum from different eco-geographic regions of Kenya display a mixed mating system

2011 ◽  
Vol 122 (8) ◽  
pp. 1631-1639 ◽  
Author(s):  
Moses M. Muraya ◽  
Evans Mutegi ◽  
Hartwig H. Geiger ◽  
Santie M. de Villiers ◽  
Fabrice Sagnard ◽  
...  
Keyword(s):  
Mating System ◽  
Mixed Mating ◽  
Wild Sorghum ◽  
Mixed Mating System ◽  
Geographic Regions
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