Incomplete partitioning of pollinators by<i>Linum suffruticosum</i>and its coflowering congeners

Pérez‐Barrales, Rocío; Armbruster, W. Scott

doi:10.1002/ajb2.16181

Cited by 5 publications

(1 citation statement)

References 139 publications

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“… Groom et al 2014 ). Indeed, Usia bee flies, which are relevant pollinators of various Linum species in the Mediterranean basin ( Johnson and Dafni 1998 ; Ruiz-Martín et al 2018 ; Pérez-Barrales and Armbruster 2023 ), significantly reduce their foraging capacity outside of their thermal tolerance range (21 to 31 °C) ( Orueta 2002 ). Therefore, it is likely that homostyly in L. trigynum was advantageous in the context of range expansion, past climatic instability and unreliable pollination services.…”

Section: Discussionmentioning

confidence: 99%

Genetic Causes and Genomic Consequences of Breakdown of Distyly in Linum trigynum

Gutiérrez-Valencia,

Zervakis,

Postel

et al. 2024

Molecular Biology and Evolution

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Distyly is an iconic floral polymorphism governed by a supergene, which promotes efficient pollen transfer and outcrossing through reciprocal differences in the position of sexual organs in flowers, often coupled with heteromorphic self-incompatibility (SI). Distyly has evolved convergently in multiple flowering plant lineages, but has also broken down repeatedly, often resulting in homostylous, self-compatible populations with elevated rates of self-fertilization. Here, we aimed to study the genetic causes and genomic consequences of the shift to homostyly in Linum trigynum, which is closely related to distylous Linum tenue. Building on a high-quality genome assembly, we show that L. trigynum harbors a genomic region homologous to the dominant haplotype of the distyly supergene conferring long stamens and short styles in L. tenue, suggesting that loss of distyly first occurred in a short-styled individual. In contrast to homostylous Primula and Fagopyrum, L. trigynum harbors no fixed loss-of-function mutations in coding sequences of S-linked distyly candidate genes. Instead, floral gene expression analyses and controlled crosses suggest that mutations downregulating the S-linked LtWDR-44 candidate gene for male SI and/or anther height could underlie homostyly and self-compatibility (SC) in L. trigynum. Population genomic analyses of 224 whole-genome sequences further demonstrate that L. trigynum is highly self-fertilizing, exhibits significantly lower genetic diversity genome-wide, and is experiencing relaxed purifying selection and less frequent positive selection on nonsynonymous mutations relative to L. tenue. Our analyses shed light on the loss of distyly in L. trigynum, and advance our understanding of a common evolutionary transition in flowering plants.

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Section: Discussionmentioning

confidence: 99%

Genetic Causes and Genomic Consequences of Breakdown of Distyly in Linum trigynum

Gutiérrez-Valencia,

Zervakis,

Postel

et al. 2024

Molecular Biology and Evolution

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Limited reproductive interference despite high rates of heterospecific pollen transfer among co‐occurring bat‐pollinated Burmeistera

Moreira‐Hernández,

Ghai,

Terzich

et al. 2023

American J of Botany

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Premise: Many tropical plants are bat-pollinated, but these mammals often carry copious, multispecific pollen loads making bat-pollinated plants susceptible to heterospecific pollen deposition and reproductive interference. We investigated pollen transfer between sympatric bat-pollinated Burmeistera species and their response to heterospecific pollen deposition from each other. Methods: We quantified conspecific and heterospecific pollen deposition for two populations of B. ceratocarpa, a recipient species in heterospecific pollen transfer interactions, that co-occur with different donor relatives (B. borjensis and B. glabrata). We then used a cross-pollination scheme using pollen mixtures to assess the species' responses to heterospecific pollen deposition in terms of fruit abortion and seed production. Results: Burmeistera ceratocarpa received significantly more heterospecific pollen from its relatives at both sites than its own pollen was deposited on its relatives. However, heterospecific pollen deposition only affected seed production by B. borjensis and B. glabrata, but not by B. ceratocarpa, suggesting that early acting post-pollination barriers buffer the latter against reproductive interference. Crosses between sympatric and allopatric populations suggest that the study species are fully isolated in sympatry, while isolation between allopatric populations is strong but incomplete. Conclusions: We did not observe evidence of reproductive interference among our study species, because either heterospecific pollen deposition did not affect their seed production (B. ceratocarpa) or they receive heterospecific pollen only rarely (B. borjensis and B. glabrata). Frequent heterospecific pollen deposition might favor the evolution of barriers against foreign pollen (as in B. ceratocarpa) that alleviate the competitive costs of sharing low fidelity pollinators with cooccurring species.

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Pollen as the link between floral phenotype and fitness

Opedal

Pérez‐Barrales

Brito

et al. 2023

American J of Botany

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Pollen plays a key role in plant reproductive biology. Despite the long history of research on pollen and pollination, recent advances in pollen-tracking methods and statistical approaches to linking plant phenotype, pollination performance, and reproductive fitness yield a steady flow of exciting new insights. In this introduction to the Special Issue "Pollen as the Link Between Phenotype and Fitness," we start by describing a general conceptual model linking functional classes of floral phenotypic traits to pollinationrelated performance metrics and reproductive fitness. We use this model as a framework for synthesizing the relevant literature, highlighting the studies included in the Special Issue, and identifying gaps in our understanding and opportunities for further development of the field. The papers that follow in this Special Issue provide new insights into the relationships between pollen production, presentation, flower morphology, and pollination performance (e.g., pollen deposition onto stigmas), the role of pollinators in pollen transfer, and the consequences of heterospecific pollen deposition. Several of the studies demonstrate exciting experimental and analytical approaches that should pave the way for continued work addressing the intriguing role of pollen in linking plant phenotypes to reproductive fitness.

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Incomplete partitioning of pollinators byLinum suffruticosumand its coflowering congeners

Cited by 5 publications

References 139 publications

Genetic Causes and Genomic Consequences of Breakdown of Distyly in Linum trigynum

Genetic Causes and Genomic Consequences of Breakdown of Distyly in Linum trigynum

Limited reproductive interference despite high rates of heterospecific pollen transfer among co‐occurring bat‐pollinated Burmeistera

Pollen as the link between floral phenotype and fitness

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