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Experimental insights on the function of ancillary pollen and stigma polymorphisms in plants with heteromorphic incompatibility.
Evolution 2017; 71(1):121-134E

Abstract

Most heterostylous plants possess a reciprocal arrangement of stigmas and anthers (reciprocal herkogamy), heteromorphic self-incompatibility, and ancillary polymorphisms of pollen and stigmas. The topographical complementarity hypothesis proposes that ancillary polymorphisms function in the rejection of incompatible pollen thus promoting disassortative pollination. Here, we test this hypothesis by investigating patterns of pollen transfer and capture in populations of dimorphic Armeria maritima and A. pubigera and distylous Limonium vulgare (Plumbaginaceae), and by studying pollen adherence and germination patterns in A. maritima following controlled hand-pollinations. Armeria lacks reciprocal herkogamy allowing the evaluation of the extent to which ancillary polymorphisms affect the composition of pollen loads. We compared the amounts of compatible and incompatible pollen on stigmas in natural populations and calculated the proficiencies of pollen transfer for each mating type. We detected disassortative pollination in each species, and mating types did not differ in compatible pollen capture, although cob stigmas captured more incompatible pollen. Controlled hand-pollinations revealed the failure of incompatible pollen to adhere and germinate on stigmas. Our results provided evidence that, while structural in nature, pollen-stigma dimorphisms are tightly associated with heteromorphic incompatibility and likely function to promote disassortative pollination, especially in the absence of reciprocal herkogamy.

Authors+Show Affiliations

Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal.Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal. Botanical Garden of the University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal.Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Calçada Martim de Freitas, 3000-456, Coimbra, Portugal.Department of Ecology and Evolutionary Biology, University of Toronto, 25 Willcocks Street, Toronto, Ontario, M5S 3B2, Canada.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

27714795

Citation

Costa, Joana, et al. "Experimental Insights On the Function of Ancillary Pollen and Stigma Polymorphisms in Plants With Heteromorphic Incompatibility." Evolution; International Journal of Organic Evolution, vol. 71, no. 1, 2017, pp. 121-134.
Costa J, Castro S, Loureiro J, et al. Experimental insights on the function of ancillary pollen and stigma polymorphisms in plants with heteromorphic incompatibility. Evolution. 2017;71(1):121-134.
Costa, J., Castro, S., Loureiro, J., & Barrett, S. C. (2017). Experimental insights on the function of ancillary pollen and stigma polymorphisms in plants with heteromorphic incompatibility. Evolution; International Journal of Organic Evolution, 71(1), pp. 121-134. doi:10.1111/evo.13082.
Costa J, et al. Experimental Insights On the Function of Ancillary Pollen and Stigma Polymorphisms in Plants With Heteromorphic Incompatibility. Evolution. 2017;71(1):121-134. PubMed PMID: 27714795.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Experimental insights on the function of ancillary pollen and stigma polymorphisms in plants with heteromorphic incompatibility. AU - Costa,Joana, AU - Castro,Sílvia, AU - Loureiro,João, AU - Barrett,Spencer C H, Y1 - 2016/10/27/ PY - 2016/02/11/received PY - 2016/09/28/accepted PY - 2016/10/28/pubmed PY - 2017/9/26/medline PY - 2016/10/8/entrez KW - Armeria KW - Limonium KW - disassortative pollination KW - floral function KW - heterostyly KW - pollen-stigma dimorphism SP - 121 EP - 134 JF - Evolution; international journal of organic evolution JO - Evolution VL - 71 IS - 1 N2 - Most heterostylous plants possess a reciprocal arrangement of stigmas and anthers (reciprocal herkogamy), heteromorphic self-incompatibility, and ancillary polymorphisms of pollen and stigmas. The topographical complementarity hypothesis proposes that ancillary polymorphisms function in the rejection of incompatible pollen thus promoting disassortative pollination. Here, we test this hypothesis by investigating patterns of pollen transfer and capture in populations of dimorphic Armeria maritima and A. pubigera and distylous Limonium vulgare (Plumbaginaceae), and by studying pollen adherence and germination patterns in A. maritima following controlled hand-pollinations. Armeria lacks reciprocal herkogamy allowing the evaluation of the extent to which ancillary polymorphisms affect the composition of pollen loads. We compared the amounts of compatible and incompatible pollen on stigmas in natural populations and calculated the proficiencies of pollen transfer for each mating type. We detected disassortative pollination in each species, and mating types did not differ in compatible pollen capture, although cob stigmas captured more incompatible pollen. Controlled hand-pollinations revealed the failure of incompatible pollen to adhere and germinate on stigmas. Our results provided evidence that, while structural in nature, pollen-stigma dimorphisms are tightly associated with heteromorphic incompatibility and likely function to promote disassortative pollination, especially in the absence of reciprocal herkogamy. SN - 1558-5646 UR - https://www.unboundmedicine.com/medline/citation/27714795/Experimental_insights_on_the_function_of_ancillary_pollen_and_stigma_polymorphisms_in_plants_with_heteromorphic_incompatibility_ L2 - https://doi.org/10.1111/evo.13082 DB - PRIME DP - Unbound Medicine ER -