Pollen Donor Identity Affects Timing of Stigma Receptivity inCollinsia heterophylla(Plantaginaceae): A Sexual Conflict during Pollen Competition?

2007 ◽  
Vol 170 (6) ◽  
pp. 854-863 ◽  
Author(s):  
Åsa Lankinen ◽  
Samuel Kiboi
Keyword(s):  
Sexual Conflict ◽  
Pollen Competition ◽  
Stigma Receptivity ◽  
Pollen Donor

scholarly journals Can Sexual Selection Cause Divergence in Mating System-Related Floral Traits?

2019 ◽  
Author(s):  
Åsa Lankinen ◽  
Maria Strandh
Keyword(s):  
Sexual Selection ◽  
Mating System ◽  
Experimental Evolution ◽  
Seed Set ◽  
Pollen Competition ◽  
Floral Traits ◽  
Mixed Mating ◽  
Stigma Receptivity ◽  
Source Line ◽  
Outcrossing Species

AbstractPremise of the ResearchThe wide diversity of floral traits seen among plants is shaped by neutral and selective evolutionary processes. In outcrossing species, sexual selection from competing pollen donors is expected to be important for shaping mating system-related traits but empirical evidence is scarce. In a previous evaluation of experimental evolution lines crossed with either one or two pollen donors (monogamous, M, or polyandrous, P, lines) at early floral stages in mixed-mating Collinsia heterophylla (Plantaginaceae), P showed enhanced pollen competitive ability and reduced maternal seed set compared to M, in accordance with sexually antagonistic evolution of pollen. Here, we asked whether the presence of sexual selection during pollen competition affect mating system-related floral traits in the same lines.MethodologyWe compared flowering start, timing of anther-stigma contact (as an indication of timing of self-pollination), timing of stigma receptivity and first seed set between M and P, and with a source line, S (starting material). The former three traits are later in outcrossers than in selfers of Collinsia. The latter trait was expected to be earlier in P than in M because of sexual selection for early seed siring of pollen.Pivotal ResultsArtificial polyandry for four generations resulted in later flowering start and later anther-stigma contact in P compared to M, and the latter trait was intermediate in S. Thus, P appeared more ‘outcrossing’ than M. Stigma receptivity did not differ between lines. First seed set was earlier in P than in M, as expected from sexual selection.ConclusionsOur results from C. heterophylla experimental evolution lines suggest that a component of sexual selection during outcross pollination could enhance the patterns of floral divergence commonly found between outcrossers and selfers.

scholarly journals Selective fertilization in interspecific crosses of allotetraploid species of Gossypium

Botany ◽  
2012 ◽  
Vol 90 (3) ◽  
pp. 159-166 ◽  
Author(s):  
G.S. Pereira ◽  
R.L. Sousa ◽  
R.L. Araújo ◽  
L.V. Hoffmann ◽  
E.F. Silva ◽  
...  
Keyword(s):  
Upland Cotton ◽  
Interspecific Hybrids ◽  
Low Frequency ◽  
Pollen Competition ◽  
Interspecific Crosses ◽  
Gossypium Hirsutum L ◽  
Hybrid Production ◽  
Pollen Donor ◽  
Allotetraploid Species

The genus Gossypium is composed of both diploid and allotetraploid species. The five allotetraploid species of Gossypium are sexually compatible, and only partial sexual barriers have been described. Natural hybrids among them do not occur or occur in situ with very low frequency in Brazil in the rare places where cultivated upland cotton ( Gossypium hirsutum L.) occurs in a sympatric range with Gossypium barbadense L. or Gossypium mustelinum Miers. We evaluated the presence of pollen competition as a prezygotic barrier in crosses between upland cotton and G. barbadense and G. mustelinum. We found that G. barbadense pollinated with a mixture of 50% upland cotton and 50% G. barbadense pollen resulted in 17.4%–31.1% interspecific hybrids, depending upon the upland cotton genotype used as pollen donor. Mixtures containing pollen from G. mustelinum and upland cotton, used to pollinate G. mustelinum in proportions of 25%:75%, 50%:50%, and 75%:25%, produced 61.3%, 22.5%, and 3.6% interspecific hybrids, respectively. These low rates of hybrid production demonstrate that pollen competition is present with G. mustelinum and G. barbadense and confirms this mechanism as a sexual barrier.

scholarly journals Factors Influencing Male Reproductive Success in a Cryptomeria japonica Seed Orchard Revealed by Microsatellite Marker Analysis

2007 ◽  
Vol 56 (1-6) ◽  
pp. 207-214 ◽  
Author(s):  
Y. Moriguchi ◽  
S. Tsuchiya ◽  
H. Iwata ◽  
S. Itoo ◽  
N. Tani ◽  
...  
Keyword(s):  
Reproductive Success ◽  
Cryptomeria Japonica ◽  
Male Flower ◽  
Seed Orchard ◽  
Pollen Competition ◽  
Male Reproductive Success ◽  
Flower Production ◽  
Pollen Donor ◽  
Self Fertilization ◽  
External Sources

AbstractWe investigated the influence of male flower production, floral synchrony and inter-tree distances on male reproductive success in a miniature seed orchard of Cryptomeria japonica. We used six microsatellite markers to determine the paternity of each seed. In the seed orchard, the average pollen contamination and clonal self-fertilization rates were 38.7% and 1.7%, respectively. The level of male reproductive success of constituent clones varied from 0.0 to 15.7%. Five clones showing the highest male reproductive success contributed ca. 30% of all analyzed seeds as a pollen donor after excluding contamination by external sources of pollen. The statistical analyses showed that male reproductive success was strongly influenced by male flower production of each clone and, possibly, by their distance to the mother trees. The linear regression which included male flower production and floral synchrony as independent variables, however, accounted for only 14.7% of variation of male reproductive success, suggesting that other factors such as pollen competition might also influence male reproductive success. Since we found no significant correlation between male reproductive and female reproductive successes, it may be better to equalize male and female reproductive successes independently

scholarly journals Selection on pollen and pistil traits during pollen competition is affected by both sexual conflict and mixed mating in a self-compatible herb

2015 ◽  
Vol 103 (3) ◽  
pp. 541-552 ◽  
Author(s):  
Åsa Lankinen ◽  
Henrik G. Smith ◽  
Stefan Andersson ◽  
Josefin A. Madjidian
Keyword(s):  
Sexual Conflict ◽  
Pollen Competition ◽  
Mixed Mating
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