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

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

Herbivory alters the expression of a mixed-mating system

2004 ◽  
Vol 91 (7) ◽  
pp. 1046-1051 ◽  
Author(s):  
Janette A. Steets ◽  
Tia-Lynn Ashman
Keyword(s):  
Mating System ◽  
Mixed Mating ◽  
Mixed Mating System

scholarly journals Variation in reproductive effort, genetic diversity and mating systems across Posidonia australis seagrass meadows in Western Australia

AoB Plants ◽  
2020 ◽  
Vol 12 (4) ◽  
Author(s):  
Elizabeth A Sinclair ◽  
Jane M Edgeloe ◽  
Janet M Anthony ◽  
John Statton ◽  
Martin F Breed ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Mating System ◽  
Western Australia ◽  
Reproductive Effort ◽  
Genetic Data ◽  
Fruit Production ◽  
Mixed Mating ◽  
Mixed Mating System ◽  
Shark Bay ◽  
Range Edge

Abstract Populations at the edges of their geographical range tend to have lower genetic diversity, smaller effective population sizes and limited connectivity relative to centre of range populations. Range edge populations are also likely to be better adapted to more extreme conditions for future survival and resilience in warming environments. However, they may also be most at risk of extinction from changing climate. We compare reproductive and genetic data of the temperate seagrass, Posidonia australis on the west coast of Australia. Measures of reproductive effort (flowering and fruit production and seed to ovule ratios) and estimates of genetic diversity and mating patterns (nuclear microsatellite DNA loci) were used to assess sexual reproduction in northern range edge (low latitude, elevated salinities, Shark Bay World Heritage Site) and centre of range (mid-latitude, oceanic salinity, Perth metropolitan waters) meadows in Western Australia. Flower and fruit production were highly variable among meadows and there was no significant relationship between seed to ovule ratio and clonal diversity. However, Shark Bay meadows were two orders of magnitude less fecund than those in Perth metropolitan waters. Shark Bay meadows were characterized by significantly lower levels of genetic diversity and a mixed mating system relative to meadows in Perth metropolitan waters, which had high genetic diversity and a completely outcrossed mating system. The combination of reproductive and genetic data showed overall lower sexual productivity in Shark Bay meadows relative to Perth metropolitan waters. The mixed mating system is likely driven by a combination of local environmental conditions and pollen limitation. These results indicate that seagrass restoration in Shark Bay may benefit from sourcing plant material from multiple reproductive meadows to increase outcrossed pollen availability and seed production for natural recruitment.

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

2019 ◽  
Vol 124 (1) ◽  
pp. 179-187 ◽  
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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