Genetic rescue by distant trees mitigates qualitative pollen limitation imposed by fine-scale spatial genetic structure.

Autor: Castilla AR; Instituto Superior of Agronomy, Centre for Applied Ecology 'Prof. Baeta Neves'/INBIO, University of Lisbon, Lisbon, Portugal.; Departamento de Ecología Integrativa, Estación Biológica de Doñana (EBD), Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Garrote PJ; Instituto Superior of Agronomy, Centre for Applied Ecology 'Prof. Baeta Neves'/INBIO, University of Lisbon, Lisbon, Portugal.; Departamento de Biología de la Conservación, Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Żywiec M; Instituto Superior of Agronomy, Centre for Applied Ecology 'Prof. Baeta Neves'/INBIO, University of Lisbon, Lisbon, Portugal.; W. Szafer Institute of Botany, Polish Academy of Sciences, Krakow, Poland., Calvo G; Departamento de Biología de la Conservación, Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Suárez-Esteban A; Departamento de Biología de la Conservación, Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Delibes M; Departamento de Biología de la Conservación, Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Godoy JA; Departamento de Ecología Integrativa, Estación Biológica de Doñana (EBD), Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Picó FX; Departamento de Ecología Integrativa, Estación Biológica de Doñana (EBD), Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain., Fedriani JM; Instituto Superior of Agronomy, Centre for Applied Ecology 'Prof. Baeta Neves'/INBIO, University of Lisbon, Lisbon, Portugal.; Departamento de Biología de la Conservación, Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas (CSIC), Sevilla, Spain.; Centro de Investigaciones sobre Desertificación CIDE, CSIC-UVEG-GV, Moncada, Spain.
Jazyk: angličtina
Zdroj: Molecular ecology [Mol Ecol] 2019 Oct; Vol. 28 (19), pp. 4363-4374. Date of Electronic Publication: 2019 Sep 27.
DOI: 10.1111/mec.15233
Abstrakt: Restricted seed dispersal frequently leads to fine-scale spatial genetic structure (i.e., FSGS) within plant populations. Depending on its spatial extent and the mobility of pollinators, this inflated kinship at the immediate neighbourhood can critically impoverish pollen quality. Despite the common occurrence of positive FSGS within plant populations, our knowledge regarding the role of long-distance pollination preventing reproductive failure is still limited. Using microsatellite markers, we examined the existence of positive FSGS in two low-density populations of the tree Pyrus bourgaeana. We also designed controlled crosses among trees differing in their kinship to investigate the effects of increased local kinship on plant reproduction. We used six pollination treatments and fully monitored fruit production, fruit and seed weight, proportion of mature seeds per fruit, and seed germination. Our results revealed positive FSGS in both study populations and lower fruit initiation in flowers pollinated with pollen from highly-genetically related individuals within the neighbourhood, with this trend intensifying as the fruit development progressed. Besides, open-pollinated flowers exhibited lower performance compared to those pollinated by distant pollen donors, suggesting intense qualitative pollen limitation in natural populations. We found positive fine-scale spatial genetic structure is translated into impoverished pollen quality from nearby pollen donors which negatively impacts the reproductive success of trees in low-density populations. Under this scenario of intrapopulation genetic rescue by distant pollen donors, the relevance of highly-mobile pollinators for connecting spatially and genetically distant patches of trees may be crucial to safeguarding population recruitment.
(© 2019 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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