scholarly journals Mutations in two pollen self-incompatibility factors in geographically marginal populations of Solanum habrochaites impact mating system transitions and reproductive isolation

2016 ◽  
Vol 103 (10) ◽  
pp. 1847-1861 ◽  
Author(s):  
Dragomira N. Markova ◽  
Jennifer J. Petersen ◽  
Xiaoqiong Qin ◽  
Daniel R. Short ◽  
Matthew J. Valle ◽  
...  
Keyword(s):  
Reproductive Isolation ◽  
Mating System ◽  
Self Incompatibility ◽  
Marginal Populations ◽  
Solanum Habrochaites

Mating system and cross-compatibility of races of Epacris impressa

1982 ◽  
Vol 30 (2) ◽  
pp. 131 ◽  
Author(s):  
YJ Fripp
Keyword(s):  
Mating System ◽  
Hybrid Seed ◽  
Self Incompatibility ◽  
Low Level ◽  
Cross Compatibility ◽  
Outcrossing Species ◽  
Different Populations ◽  
Number Of Seeds

The mating system and cross-compatibility of races of Epacris impressa Labill. were examined by a series of selfings, outcrosses between plants of the same race from the same and different populations, and outcrosses between plants of different races. The percentage of pollinations which gave capsules and the number of seeds present per capsule for these four types of crosses, and whether the seeds germinated, were scored. The results indicate that E. impressa is an outcrossing species with a self-incompatibility mechanism to keep selfing at a low level, the races cross freely and the hybrid seed is viable. The means over all races for the above four types of crosses were 8.7 (selfing), 62.3, 62.5 and 65.5 for the percentage of pollinations that were successful and 8.4 (selfing), 43.5, 41.2 and 39.0 for the number of seeds per capsule. The results of a limited number of crosses between Epacris impressa and other epacrid species are also given.

scholarly journals Limited phenological and pollinator-mediated isolation among selfing and outcrossing Arabidopsis lyrata populations

2020 ◽  
Vol 287 (1939) ◽  
pp. 20202323
Author(s):  
Courtney E. Gorman ◽  
Lindsay Bond ◽  
Mark van Kleunen ◽  
Marcel E. Dorken ◽  
Marc Stift
Keyword(s):  
Reproductive Isolation ◽  
Mating System ◽  
Common Garden ◽  
Common Garden Experiment ◽  
Pollinator Visitation ◽  
Arabidopsis Lyrata ◽  
Pollinator Preference ◽  
Pollination Mechanisms ◽  
Self Fertilization ◽  
Mechanistic Basis

Transitions from outcrossing to selfing have been a frequent evolutionary shift in plants and clearly play a role in species divergence. However, many questions remain about the initial mechanistic basis of reproductive isolation during the evolution of selfing. For instance, how important are pre-zygotic pre-pollination mechanisms (e.g. changes in phenology and pollinator visitation) in maintaining reproductive isolation between newly arisen selfing populations and their outcrossing ancestors? To test whether changes in phenology and pollinator visitation isolate selfing populations of Arabidopsis lyrata from outcrossing populations, we conducted a common garden experiment with plants from selfing and outcrossing populations as well as their between-population hybrids. Specifically, we asked whether there was isolation between outcrossing and selfing plants and their between-population hybrids through differences in (1) the timing or intensity of flowering; and/or (2) pollinator visitation. We found that phenology largely overlapped between plants from outcrossing and selfing populations. There were also no differences in pollinator preference related to mating system. Additionally, pollinators preferred to visit flowers on the same plant rather than exploring nearby plants, creating a large opportunity for self-fertilization. Overall, this suggests that pre-zygotic pre-pollination mechanisms do not strongly reproductively isolate plants from selfing and outcrossing populations of Arabidopsis lyrata .

scholarly journals Mating system transitions in Solanum habrochaites impact interactions between populations and species

2016 ◽  
Vol 213 (1) ◽  
pp. 440-454 ◽  
Author(s):  
Amanda K. Broz ◽  
April M. Randle ◽  
Shelley A. Sianta ◽  
Alejandro Tovar-Méndez ◽  
Bruce McClure ◽  
...  
Keyword(s):  
Mating System ◽  
Solanum Habrochaites

Effect of forest fragmentation and altitude on the mating system of Eucalyptus pauciflora (Myrtaceae)

2013 ◽  
Vol 61 (8) ◽  
pp. 622 ◽  
Author(s):  
Archana Gauli ◽  
René E. Vaillancourt ◽  
Dorothy A. Steane ◽  
Tanya G. Bailey ◽  
Brad M. Potts
Keyword(s):  
Habitat Fragmentation ◽  
Population Density ◽  
Mating System ◽  
Forest Restoration ◽  
Outcrossing Rate ◽  
Self Incompatibility ◽  
Fragmented Populations ◽  
System Parameters ◽  
Key Factor ◽  
Seed Yields

Habitat fragmentation is a key factor causing variation in important mating system parameters in plants, but its effect is variable. We studied mating system variation among 276 native trees from 37 populations of Eucalyptus pauciflora from Tasmania. We assayed 10 microsatellite loci from 1359 open-pollinated progeny from these trees. Across Tasmania the species’ mating system was characterised by a high outcrossing rate (tm = 0.90) but moderate bi-parental inbreeding (tm–ts = 0.16) and moderate correlated paternity (rP = 0.20) in comparison to other eucalypt species. Despite significant differences in outcrossing rate and correlated paternity among populations, this variation was not correlated with fragmentation. Nevertheless, fragmentation was inversely correlated with the number of germinants per gram of seed capsule content. Outcrossing rate had been reported previously to decrease with increasing altitude in mainland populations of E. pauciflora, but this was not the case in Tasmania. However, a small but significant decrease in correlated paternity occurred with increasing altitude and a decrease in bi-parental inbreeding with increasing altitude was evident in fragmented populations only. It is argued that strong, but incomplete self-incompatibility mechanisms may buffer the mating system from changes in population density and pollinators. While seed yields from highly fragmented populations were reduced, in most cases the seed obtained is unlikely to be more inbred than that from non-fragmented populations and, thus, is likely to be as suitable for use in local forest restoration.

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