Active pollination drives selection for reduced pollen-ovule ratios.

Autor: Pellmyr O; Department of Biology, University of Idaho, Moscow, Idaho, 83844, USA., Kjellberg F; CEFE, CNRS, Université Montpellier, Université Paul Valéry Montpellier, EPHE, IRD, Montpellier, Cédex 5, France., Herre EA; Smithsonian Tropical Research Institute, Apartado Postal, 0843-03092, Panamá, Republic of Panama., Kawakita A; The Botanical Gardens, Graduate School of Science, University of Tokyo, 3-7-1 Hakusan, Bonkyo-ku, Tokyo, Japan., Hembry DH; Department of Entomology, Cornell University, 2130 Comstock Hall, Ithaca, New York, 14853, USA.; Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona, 85721, USA., Holland JN; School of Dentistry, University of Texas, 7500 Cambridge Street, Houston, Texas, 77054, USA., Terrazas T; Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, Mexico City, 04510, Mexico., Clement W; Department of Biology, The College of New Jersey, 2000 Pennington Road, Ewing, New Jersey, 08628, USA., Segraves KA; Department of Biology, Syracuse University, 107 College Place, Syracuse, New York, 13244, USA., Althoff DM; Department of Biology, Syracuse University, 107 College Place, Syracuse, New York, 13244, USA.
Jazyk: angličtina
Zdroj: American journal of botany [Am J Bot] 2020 Jan; Vol. 107 (1), pp. 164-170. Date of Electronic Publication: 2019 Dec 30.
DOI: 10.1002/ajb2.1412
Abstrakt: Premise: Variation in pollen-ovule ratios is thought to reflect the degree of pollen transfer efficiency-the more efficient the process, the fewer pollen grains needed. Few studies have directly examined the relationship between pollen-ovule ratio and pollen transfer efficiency. For active pollination in the pollination brood mutualisms of yuccas and yucca moths, figs and fig wasps, senita and senita moths, and leafflowers and leafflower moths, pollinators purposefully collect pollen and place it directly on the stigmatic surface of conspecific flowers. The tight coupling of insect reproductive interests with pollination of the flowers in which larvae develop ensures that pollination is highly efficient.
Methods: We used the multiple evolutionary transitions between passive pollination and more efficient active pollination to test if increased pollen transfer efficiency leads to reduced pollen-ovule ratios. We collected pollen and ovule data from a suite of plant species from each of the pollination brood mutualisms and used phylogenetically controlled tests and sister-group comparisons to examine whether the shift to active pollination resulted in reduced pollen-ovule ratios.
Results: Across all transitions between passive and active pollination in plants, actively pollinated plants had significantly lower pollen-ovule ratios than closely related passively pollinated taxa. Phylogenetically corrected comparisons demonstrated that actively pollinated plant species had an average 76% reduction in the pollen-ovule ratio.
Conclusions: The results for active pollination systems support the general utility of pollen-ovule ratios as indicators of pollination efficiency and the central importance of pollen transfer efficiency in the evolution of pollen-ovule ratio.
(© 2019 Botanical Society of America.)
Databáze: MEDLINE
Externí odkaz: