Pollen-Pistil Interactions and Their Role in Mate Selection

Bedinger, Patricia A.; Broz, Amanda K.; Tovar‐Méndez, Alejandro; McClure, Bruce

doi:10.1104/pp.16.01286

Cited by 88 publications

(97 citation statements)

References 133 publications

(176 reference statements)

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“…Pollen adhesion is known to mediate discrimination against self and interspecific pollen in species with dry stigmas (Zinkl et al ., ; Edlund et al ., ; Swanson et al ., ), however these species have sporophytic SI mechanisms (Clarke & Newbigin, ; Golz et al ., ; Franklin‐Tong & Franklin, ), and not gametophytic SI as is seen in Phlox (Levin, ). Most gametophytic SI systems involve the rejection of self‐pollen during pollen tube growth in the style and not on the stigma surface (Edlund et al ., ; Swanson et al ., ; Bedinger et al ., ). An exception is gametophytic SI in Papaver , which involves stigmatic protein secretions that trigger self‐specific termination of pollen tube growth shortly after germination (Franklin‐Tong, ; Wilkins et al ., , ).…”

Section: Discussionmentioning

confidence: 97%

“…It has long been hypothesized that the molecular and biochemical mechanisms causing SI can also cause pollen–pistil incompatibilities between species (Harrison & Darby, ; Abdalla, ; Pandey, ; Hancock et al ., ). If this mechanistic link exists, then selection to increase II could lead to a pleiotropic increase in SI (Bedinger et al ., ). There is evidence across a number of genera that overlapping pollen recognition and rejection systems cause SI and II.…”

Section: Introductionmentioning

confidence: 97%

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Correlated evolution of self and interspecific incompatibility across the range of a Texas wildflower

Roda

Hopkins

2018

New Phytologist

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Selection to prevent interspecific mating can cause an increase or a decrease in self-pollination in sympatric populations. Characterizing the geographical variation in self and interspecific incompatibilities within a species can reveal if and how the evolution of self and interspecific mate choice are linked. We used controlled pollinations to characterize the variation in self and interspecific incompatibility across 29 populations of Phlox drummondii. We evaluated seed set from these pollinations and described the developmental timing of variation in pollen-pistil compatibility. There is extensive quantitative variation in self-incompatibility and interspecific-incompatibility with its close congener P. cuspidata. Phlox drummondii populations that co-occur and hybridize with P. cuspidata have significantly higher interspecific incompatibility and self-incompatibility than geographically isolated P. drummondii populations. The strength of self and interspecific incompatibility is significantly correlated among individuals and the strength of both incompatibilities is explained by the success of pollen adhesion to the stigma. The correlated strength of self and interspecific incompatibility across the range of P. drummondii and the concurrent developmental timing of the pollen-pistil interaction, suggests these incompatibilities have an overlapping molecular mechanism. The geographical distribution of variation in incompatibilities indicates that this mechanistic link between incompatibilities may affect the evolution of mate choice in plants.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

Correlated evolution of self and interspecific incompatibility across the range of a Texas wildflower

Roda

Hopkins

2018

New Phytologist

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“…For HT-protein detection, extracts equivalent to 1.5mg fresh weight were separated in 12.5% Tris-Tricine SDS PAGE, blotted to PVDF, and immunostained (1:5000) with an affinity-purified antibody that recognizes both HT-A and HT-B proteins. The antibody was prepared against the synthetic peptide LEANEIHNTELNNPTLQKKGGC-amide (21st Century Biochemicals), as described previously (Tovar-Méndez, et al ., 2017).…”

Section: Methodsmentioning

confidence: 99%

Intraspecific genetic variation underlying postmating reproductive barriers between species in the wild tomato clade (Solanumsect.Lycopersicon)

Jewell

Zhang

Gibson

et al. 2019

Preprint

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23A goal of speciation genetics is to understand how the genetic components underlying 24 interspecific reproductive barriers originate within species. Unilateral incompatibility (UI) is a 25 postmating prezygotic barrier in which pollen rejection in the female reproductive tract (style) 26 occurs in only one direction of an interspecific cross. Natural variation in the strength of UI has 27 been observed among populations within species in the wild tomato clade. In some cases, 28 molecular loci underlying self-incompatibility (SI) are associated with this variation in UI, but the 29 mechanistic connection between these intra-and inter-specific pollen rejection behaviors is 30 poorly understood in most instances. We generated an F 2 population between SI and SC 31 genotypes of a single species, Solanum pennellii, to examine the genetic basis of intraspecific 32 variation in the strength of UI against other species, and to determine whether loci underlying 33 SI are genetically associated with this variation. We found that F 2 individuals vary in the rate at 34 which UI rejection occurs. One large effect QTL detected for this trait co-localized with the SI-35 determining S-locus. Moreover, individuals that expressed S-RNase-the S-locus protein 36 involved in SI pollen rejection-in their styles had much more rapid UI responses compared to 37 those without S-RNase protein. Our analysis shows that intraspecific variation at mate choice 38 loci-in this case at loci that prevent self-fertilization-can contribute to variation in the 39 strength of interspecific isolation, including postmating prezygotic barriers. Understanding the 40 nature of such standing variation can provide insight into the accumulation of these barriers 41 between diverging lineages. 42 43 49reproducing organisms-reproductive isolation, among diverging lineages. Accordingly, loci that 50 contribute to this cumulative process between species must first arise within an individual 51 population prior to spreading to other conspecific populations within their own lineage. During 52 this process, populations of a single species are expected to show varying strengths of 53 reproductive isolation against other lineages; that is, there will be intraspecific genetic variation 54 for the magnitude of interspecific reproductive isolation from other lineages. Intraspecific 55 phenotypic variation in the strength of hybrid incompatibility has been observed in many 56 systems including mammals (Good, Handel and Nachman, 2007; Vyskočilová, Pražanová and 57 60 Sweigart, Mason and Willis, 2007). Understanding the nature, origin, and accumulation of this 61 variation, including the underlying molecular genetic variants responsible, can provide insight 62 into the evolutionary dynamics of lineage divergence (Cutter, 2012), including the order in 63 which alleles contributing to interspecific reproductive isolation arise and fix within diverging 64 lineages. 66The genetic basis of intraspecific variation for interspecific barriers has been 67 in...

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“…is self-incompatible (SI) and the other is self-compatible (SC), SI pollen may pollinate 520 SC ovules, but the reverse cross fails through the production of improperly developed 521 seeds (Brandvain and Haig, 2005;Bedinger et al, 2017). Although both B. stricta and 522…”

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confidence: 99%

The evolution of sex is tempered by costly hybridization inBoechera(rock cress)

Rushworth

Mitchell‐Olds

2020

Preprint

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Even after decades of research, the evolution of sex remains an enigma in evolutionary biology. Typically, research addresses the costs of sex and asexuality to characterize the circumstances in which one reproductive system is more favorable. Yet surprisingly few studies address the influence of common traits that are obligately correlated with asexuality, including hybridization and polyploidy; even though these traits have substantial impacts on selective patterns. In particular, hybridization is well-known to alter trait expression; these alterations may themselves represent a cost of sex. We examined the role of reproductive isolation in the formation of de novo hybrid lineages between two widespread species in the ecological model system Boechera. Of 664 crosses between Boechera stricta and Boechera retrofracta, 17% of crosses produced F1 fruits. This suggests that postmating prezygotic barriers, i.e. pollen-pistil interactions, form the major barrier to hybrid success in this system. These interactions are asymmetrical, with 110 F1 fruits produced when B. stricta was the maternal parent. This asymmetry was confirmed using a chloroplast phylogeny of wild-collected B. stricta, B. retrofracta, and hybrids, which showed that most hybrids have a B. stricta chloroplast haplotype. We next compared fitness of F2 hybrids and selfed parental B. stricta lines, finding that F2 fitness was reduced by substantial hybrid sterility. Our results suggest that multiple reproductively isolating barriers likely influence the formation and fitness of hybrid lineages in the wild, and that these costs of hybridization likely have profound impacts on the costs of sex in the natural environment.

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Pollen-Pistil Interactions and Their Role in Mate Selection

Cited by 88 publications

References 133 publications

Correlated evolution of self and interspecific incompatibility across the range of a Texas wildflower

Correlated evolution of self and interspecific incompatibility across the range of a Texas wildflower

Intraspecific genetic variation underlying postmating reproductive barriers between species in the wild tomato clade (Solanumsect.Lycopersicon)

The evolution of sex is tempered by costly hybridization inBoechera(rock cress)

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