The impact of plant and flower age on mating patterns

Marshall, Diane L.; Avritt, Joy J.; Maliakal-Witt, Satya; Medeiros, Juliana S.; Shaner, Marieken G. M.

doi:10.1093/aob/mcp260

Cited by 33 publications

(39 citation statements)

References 232 publications

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“…A pattern of restricted dispersal of R. oldhamii could have been caused by small effective population sizes or possibly by the short distance Rhododendron seeds can disperse (Hirao, 2010) and ineffective pollen flow (Marshall et al, 2010), resulting in the beginning of reproductive isolation, and this may have facilitated within-population mating because of fragmentation and population divergence (Jiménez-Ambriz et al, 2007). Environmental variables might have played roles as selective forces, enforcing population adaptive divergence, in rapidly evolving small populations of R. oldhamii even when selection was weak.…”

Section: Ecologically Relevant Adaptive Divergencementioning

confidence: 99%

Historical connectivity, contemporary isolation and local adaptation in a widespread but discontinuously distributed species endemic to Taiwan, Rhododendron oldhamii (Ericaceae)

et al. 2013

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Elucidation of the evolutionary processes that constrain or facilitate adaptive divergence is a central goal in evolutionary biology, especially in non-model organisms. We tested whether changes in dynamics of gene flow (historical vs contemporary) caused population isolation and examined local adaptation in response to environmental selective forces in fragmented Rhododendron oldhamii populations. Variation in 26 expressed sequence tag-simple sequence repeat loci from 18 populations in Taiwan was investigated by examining patterns of genetic diversity, inbreeding, geographic structure, recent bottlenecks, and historical and contemporary gene flow. Selection associated with environmental variables was also examined. Bayesian clustering analysis revealed four regional population groups of north, central, south and southeast with significant genetic differentiation. Historical bottlenecks beginning 9168-13,092 years ago and ending 1584-3504 years ago were revealed by estimates using approximate Bayesian computation for all four regional samples analyzed. Recent migration within and across geographic regions was limited. However, major dispersal sources were found within geographic regions. Altitudinal clines of allelic frequencies of environmentally associated positively selected outliers were found, indicating adaptive divergence. Our results point to a transition from historical population connectivity toward contemporary population isolation and divergence on a regional scale. Spatial and temporal dispersal differences may have resulted in regional population divergence and local adaptation associated with environmental variables, which may have played roles as selective forces at a regional scale.

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Section: Ecologically Relevant Adaptive Divergencementioning

confidence: 99%

Historical connectivity, contemporary isolation and local adaptation in a widespread but discontinuously distributed species endemic to Taiwan, Rhododendron oldhamii (Ericaceae)

et al. 2013

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“…This is not surprising as other pollen indices, such as protein content and viability, are known to vary extensively between members of the same species, based on genotypic and environmental influences on plant health. 58,59 Using the highest level observed for pollen in this study, we can calculate that an adult honey bee might consume approximately 6 £ 10 7 copies of MIR156a per day, resulting in a maximum theoretical delivery of 6 copies per cell if 100% transfer of the diet-derived miRNA were achieved (using 1 £ 10 7 cells per bee as previously 25 ). Thus, even under these optimal theoretical conditions, it is difficult to envision dietary miRNA reaching distal tissues in biologically relevant levels unless aided by specialized mechanisms for concentrating or transferring miRNA in specific cell types.…”

Section: Discussionmentioning

confidence: 90%

Negligible uptake and transfer of diet-derived pollen microRNAs in adult honey bees

et al. 2015

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The putative transfer and gene regulatory activities of diet-derived miRNAs in ingesting animals are still debated. Importantly, no study to date has fully examined the role of dietary uptake of miRNA in the honey bee, a critical pollinator in both agricultural and natural ecosystems. After controlled pollen feeding experiments in adult honey bees, we observed that midguts demonstrated robust increases in plant miRNAs after pollen ingestion. However, we found no evidence of biologically relevant delivery of these molecules to proximal or distal tissues of recipient honey bees. Our results, therefore, support the premise that pollen miRNAs ingested as part of a typical diet are not robustly transferred across barrier epithelia of adult honey bees under normal conditions. Key future questions include whether other small RNA species in honey bee diets behave similarly and whether more specialized and specific delivery mechanisms exist for more efficient transport, particularly in the context of stressed barrier epithelia.

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“…In turn, mating systems might influence the evolution of floral longevity (Karle & Boyle 1999; Sato 2002; Marshall et al. 2010).…”

Section: Discussionmentioning

confidence: 99%

“…2007) or allows plants to optimise floral display sizes (Harder & Johnson 2005). Pollination‐induced floral senescence also has potential evolutionary consequences for plant mating system evolution (Marshall et al. 2010).…”

Section: Introductionmentioning

confidence: 99%

Variation in floral longevity in the genus Leptosiphon: mating system consequences

Weber

Goodwillie

2012

Plant Biology

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Pollination or fertilisation trigger floral senescence in a wide range of flowering plants, and yet little attention has been given to the implications of this phenomenon to mating system evolution. We examined the effects of pollination on floral senescence in the genus Leptosiphon. Species in the genus exhibit a wide range of breeding systems. In all cases, compatible pollination induced senescence; emasculated flowers lived longer than hand-outcrossed flowers. In the self-compatible species, Leptosiphon acicularis and L. bicolor, and in one highly selfing population of L. jepsonii, unmanipulated flowers had reduced longevity compared to emasculated flowers, suggesting that autonomous self-pollination limits floral longevity in these species. Limited floral longevity in these highly selfing taxa may reduce opportunities for male outcross success, representing a possible source of selection on the mating system. In turn, the mating system might influence how selection acts on floral longevity; obligately outcrossing taxa are expected to benefit from longer floral longevities to maximise opportunities for pollination, while selfing taxa might benefit from earlier floral senescence to reduce resource expenditure. Overall, the longevity of unpollinated flowers increased with the level of outcrossing in the genus Leptosiphon. Our results taken together with those of a previous study and similar results in other species suggest that floral longevity may represent a largely unexamined role in mating system evolution.

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The impact of plant and flower age on mating patterns

Cited by 33 publications

References 232 publications

Historical connectivity, contemporary isolation and local adaptation in a widespread but discontinuously distributed species endemic to Taiwan, Rhododendron oldhamii (Ericaceae)

Historical connectivity, contemporary isolation and local adaptation in a widespread but discontinuously distributed species endemic to Taiwan, Rhododendron oldhamii (Ericaceae)

Negligible uptake and transfer of diet-derived pollen microRNAs in adult honey bees

Variation in floral longevity in the genus Leptosiphon: mating system consequences

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