Differences in style length confer prezygotic isolation between two dioecious species of<i><scp>S</scp>ilene</i>in sympatry

Nista, Phil; Brothers, Amanda N.; Delph, Lynda F.

doi:10.1002/ece3.1350

Cited by 12 publications

(24 citation statements)

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“…Such species differentiation in style length is mirrored in several species‐rich genera including Prunus (Perez & Moore, ), Rhododendron (Williams & Rouse, ) and Nicotiana (Lee et al ., ), in which species have disparate style lengths and co‐flowering plants may have overlapping pollinators, potentially experiencing HPT. One would expect that selection for reducing the deleterious effects of HPT would be stronger in short‐styled species than in the long‐styled species (Nista et al ., ). Indeed, we found that HPT was generally lower in the short‐ than the long‐styled Pedicularis species in natural conditions (Fig.…”

Section: Discussionmentioning

confidence: 97%

“…We compared heterospecific pollen tube growth patterns in these Pedicularis species pairs. One might expect that co‐flowering species with high levels of interference by HP would evolve post‐pollination mechanisms reducing the deleterious effects of HP (Arceo‐Gómez et al ., ; Nista et al ., ). Consistent with this prediction, we found that species with short styles, which are more susceptible to the negative effects of HP receipt, received little HP.…”

Section: Introductionmentioning

confidence: 97%

“…What is the relationship between HPT and conspecific pollen deposition (see Arceo-G omez et al, 2016a)? (3) Can species with long styles provide a selective sieve for pollen from short-styled species (Ashman & Arceo-Gomez, 2013;Nista et al, 2015)? We compared heterospecific pollen tube growth patterns in these Pedicularis species pairs.…”

Section: Introductionmentioning

confidence: 99%

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Pre‐ and post‐pollination interaction between six co‐floweringPedicularisspecies via heterospecific pollen transfer

Tong

Huang

2016

New Phytologist

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SummaryIt remains unclear how related co-flowering species with shared pollinators minimize reproductive interference, given that the degree of interspecific pollen flow and its consequences are little known in natural communities.Differences in pollen size in six Pedicularis species with different style lengths permit us to measure heterospecific pollen transfer (HPT) between species pairs in sympatry. The role of pollen-pistil interactions in mitigating the effects of HPT was examined.Field observations over 2 yr showed that bumblebee pollinators visiting one species rarely moved to another. Heterospecific pollen (HP) comprised < 10% of total stigmatic pollen loads for each species over 2 yr, and was not related to conspecific pollen deposition. Species with longer styles generally received more HP per stigma. The pollen tube study showed that pollen from short-styled species could not grow the full length of the style of long-styled species. Pollen from long-styled species could grow through the short style of P. densispica, but P. densispica rarely received HP in nature.Flower constancy is a key pre-pollination barrier to HPT between co-flowering Pedicularis species. Post-pollination pollen-pistil interactions may further mitigate the effects of HPT because HP transferred to long styles could generally be effectively filtered.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Pre‐ and post‐pollination interaction between six co‐floweringPedicularisspecies via heterospecific pollen transfer

Tong

Huang

2016

New Phytologist

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“…Style-length differences among species have repeatedly been shown to lead to asymmetric crossing success, such that fertilization of long-styled species by pollen from short-styled species is impeded (Buchholz et al 1935;Grant 1966;Smith 1970;Levin 1978;Williams and Rouse 1988;Sorensson and Brewbaker 1994;Carney and Arnold 1997;Diaz and Macnair 1999;Tiffin et al 2001;Kay and Schemske 2008;Lee et al 2008;Field et al 2010;Montgomery et al 2010;Nista et al 2015). Style-length differences among species have repeatedly been shown to lead to asymmetric crossing success, such that fertilization of long-styled species by pollen from short-styled species is impeded (Buchholz et al 1935;Grant 1966;Smith 1970;Levin 1978;Williams and Rouse 1988;Sorensson and Brewbaker 1994;Carney and Arnold 1997;Diaz and Macnair 1999;Tiffin et al 2001;Kay and Schemske 2008;Lee et al 2008;Field et al 2010;Montgomery et al 2010;Nista et al 2015).…”

mentioning

confidence: 99%

“…First, style length is known to act as a postmatingprezygotic reproductive barrier between S. latifolia, which has relatively long styles, and two other closely related Silene species with shorter styles (Rahmé et al 2009;Montgomery et al 2010;Nista et al 2015). Several aspects of S. latifolia made it ideally suited to the study.…”

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confidence: 99%

Divergence in style length and pollen size leads to a postmating‐prezygotic reproductive barrier among populations of Silene latifolia

Delph

2017

Evolution

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A central tenet of speciation research is the need to identify reproductive isolating barriers. One approach to this line of research is to identify the phenotypes that lead to reproductive isolation. Several studies on flowering plants have shown that differences in style length contribute to reproductive isolation between species, leading us to consider whether style length could act as a reproductive barrier among populations of a single species. This could occur if style length varied sufficiently and pollen size covaried with style length. Populations of Silene latifolia exhibit variation in flower size, including style length, that is negatively correlated with annual precipitation. We show that this divergence in style length has a genetic basis and acts as a reproductive barrier: males from small-flowered populations produced relatively small pollen grains that were poor at fertilizing ovules when crossed to females from large-flowered populations, leading to a significant reduction in seed production. Manipulating the distance pollen tubes had to travel revealed that this failure was purely mechanical and not the result of other incompatibilities. These results show that style length acts as a postmating-prezygotic reproductive barrier and indicate a potential link between ecotypic differentiation and reproductive isolation within a species.

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Floral traits influence the opportunity for selection among male gametophytes: independent and combined effects of style length and petal area

Mazer

Chellew

Peach

2019

American J of Botany

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Premise Strong correlations between traits can obscure their independent effects on components of reproduction. Style length (SL) and petal area (PA) vary within species, for example, but their independent effects on the opportunity for selection among pollen genotypes are poorly understood. Previous work in Clarkia detected a positive effect of SL on pollen receipt, potentially intensifying selection. However, this apparent effect of SL may be influenced by a correlated trait, such as PA. Here, we examine the independent effects of these two traits on pollen receipt and performance. Methods We collected petals and styles from wild populations of two insect‐pollinated Clarkia taxa and estimated the independent and combined effects of SL and PA on pollen receipt and performance. Results In both taxa, SL and PA are positively correlated. In C. unguiculata, both traits positively and independently affect pollen receipt, but in C. xantiana ssp. xantiana, the two traits act only in combination to affect pollen receipt. In both taxa, pollen receipt positively affects the numbers of pollen tubes entering and penetrating the style, as well as pollen tube attrition. Conclusions The effects of SL and PA on pollen receipt and performance are taxon specific. In C. unguiculata, both traits may be independent targets of selection due to their effects on pollen receipt. In C. xantiana ssp. xantiana, by contrast, the combined (but not independent) effects of SL and PA influence pollen receipt. Ecological differences between these taxa require exploration to understand the mechanisms by which these traits affect pollinator behavior.

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Differences in style length confer prezygotic isolation between two dioecious species ofSilenein sympatry

Cited by 12 publications

References 69 publications

Pre‐ and post‐pollination interaction between six co‐floweringPedicularisspecies via heterospecific pollen transfer

Pre‐ and post‐pollination interaction between six co‐floweringPedicularisspecies via heterospecific pollen transfer

Divergence in style length and pollen size leads to a postmating‐prezygotic reproductive barrier among populations of Silene latifolia

Floral traits influence the opportunity for selection among male gametophytes: independent and combined effects of style length and petal area

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