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    Successful pollen dispersal modulates with flowering phase in field-hybridizing grasses

    Meade, Conor and Ryan, Eimear M. and Mulllins, Ewen and Downes, Martin (2020) Successful pollen dispersal modulates with flowering phase in field-hybridizing grasses. Biology and Environment, 120. pp. 51-60. ISSN 0791-7945

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    Gene-flow between intensively and extensively farmed grass populations is an ongoing feature of agroecological landscapes, especially in Atlantic northwestern. Europe. Adjoining population boundaries and in-field admixture of grass types via winter forage dispersal facilitates both in-field hybridisation and recruitment of immigrant seedlings. Here we examine the paternal hybridisation of one grass species (Lolium multiflorum, pollen donor) into the population of a second, fully inter-fertile, grass species (L. perenne, pollen receptor) via pollen-mediated gene-flow in an experimental field plot. Using weekly counts of successful pollination in 470 individual receptor plants based on paternity analysis in 4281 germinated F-1 seedlings, we determined the extent of evident hybridisation (hybrid progeny that show some paternal morphology) and silent hybridisation (hybrid progeny that show no paternal morphology) over the course of floral anthesis. Co-dominant morphological traits in F-1 progeny underestimated microsatellite-validated genetic hybridisation by approximately 30%, while background pollen competition dampened the overall rate of successful pollen donor pollination. Overall pollination from the donor plot followed a composite decline model. However over the course of floral anthesis the successful pollination pattern was changeable, and showed varying levels of affinity to three tested decline distribution models.

    Item Type: Article
    Keywords: Gene Flow; Plant; Wind; Microsatellite; Introgression, Biodiversity; Invasions; Release;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 13866
    Identification Number:
    Depositing User: Dr. Conor Meade
    Date Deposited: 25 Jan 2021 12:30
    Journal or Publication Title: Biology and Environment
    Publisher: Royal Irish Academy
    Refereed: No
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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