Maternal Environment Influences Propagule Pressure of an Invasive Plant, <i>Raphanus raphanistrum</i> (Brassicaceae)

Campbell, Lesley G.; Parker, Rebecca J.; Blakelock, Graham C.; Pirimova, Natalia; Mercer, Kristin L.

doi:10.1086/680683

Cited by 14 publications

(22 citation statements)

References 64 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As reported in Campbell et al [45], water manipulation treatments significantly and predictably altered the average soil volumetric moisture content (%VMC) within each experimental plot. No rain plots were approximately 50% drier than CS plots whereas DR plots were approximately 50% wetter than CS plots [45]. Finally, the %VMC of CU and CS plots did not differ significantly in 2010.…”

Section: Methodsmentioning

confidence: 58%

See 1 more Smart Citation

The Effect of Altered Soil Moisture on Hybridization Rate in a Crop-Wild System (Raphanus spp.)

et al. 2016

Self Cite

View full text Add to dashboard Cite

Since plant mating choices are flexible and responsive to the environment, rates of spontaneous hybridization may vary across ecological clines. Developing a robust and predictive framework for rates of plant gene flow requires assessing the role of environmental sensitivity on plant reproductive traits, relative abundance, and pollen vectors. Therefore, across a soil moisture gradient, we quantified pollinator movement, life-history trait variation, and unidirectional hybridization rates from crop (Raphanus sativus) to wild (Raphanus raphanistrum) radish populations. Both radish species were grown together in relatively dry (no rain), relatively wet (double rain), or control soil moisture conditions in Ohio, USA. We measured wild and crop radish life-history, phenology and pollinator visitation patterns. To quantify hybridization rates from crop-to-wild species, we used a simply inherited morphological marker to detect F1 hybrid progeny. Although crop-to-wild hybridization did not respond to watering treatments, the abundance of hybrid offspring was higher in fruits produced late in the period of phenological overlap, when both species had roughly equal numbers of open flowers. Therefore, the timing of fruit production and its relationship to flowering overlap may be more important to hybrid zone formation in Raphanus spp. than soil moisture or pollen vector movements.

show abstract

Section: Methodsmentioning

confidence: 58%

“…Our recent work has documented that R . raphanistrum corolla diameter and flower production decreases with decreasing soil moisture [45, 46]. Thus, shifts in hybridization rates may be a consequence of a series of plant responses to local environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Altered Soil Moisture on Hybridization Rate in a Crop-Wild System (Raphanus spp.)

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…Despite evidence to suggest soil moisture plays a significant role in Raphanus seed development and fecundity (Campbell et al ., ; Pirimova et al ., ), we found surprisingly little effect of experimental watering treatment on seedbank dynamics. Importantly, hybrid populations exhibited germination rates more than double that of wild populations and 58% lower rate of dormancy compared with rates in wild populations (Table , Fig.…”

Section: Discussionmentioning

confidence: 97%

Germination rates of weedy radish populations (Raphanus spp.) altered by crop‐wild hybridisation, not human‐mediated changes to soil moisture

2016

View full text Add to dashboard Cite

Cultivated plants are known to readily hybridise with their wild relatives, sometimes forming populations with weedier life-history strategies than their progenitors. Due to altered precipitation patterns from human-induced global climate change, crop-wild hybrid populations may have new and unpredictable environmental tolerances relative to parental populations, which would further challenge farming and land-management weed control strategies. To recognise the role of seed dormancy variation in weed invasion, we compared seedbank dynamics of two cross-type populations (wild radish, Raphanus raphanistrum, and crop-wild hybrid radish, R. raphanistrum 9 R. sativus) across a soil moisture gradient. In a seed-burial experiment, we assessed relative rates of seed germination, dormancy and seed mortality over two years across cross types (crop-wild hybrid or wild) and watering treatments (where water was withheld, equal to annual rainfall, or double annual rainfall). Weekly population censuses in 2012 and 2013 assessed the frequency and timing of seedling emergence within a growing season. Generally, germination rates were two times higher and seed dormancy was 58% lower in hybrid versus wild populations. Surprisingly, experimental soil moisture conditions did not determine seedbank dynamics over time. Yet, seed bank dynamics changed between years, potentially related to different amounts of annual rainfall. Thus, variation in seedbank dynamics may be driven by crop-wild hybridisation rates and, potentially, annual variation in soil moisture conditions.

show abstract

“…During the summer of 2010, 36 populations of nine F 0 cultivated and nine F 0 wild plants were grown in field plots in Columbus, OH and exposed to one of four watering treatments (no rain, double rain and two types of control plots), as described in [52] to create wild and hybrid offspring at naturally occurring rates. To determine if crop-wild hybrid radish populations experience stronger selection on demographic traits than wild radish, in 2011, we established 24 replicated populations (plots) of wild or F 1 crop-wild hybrid radish seeds.…”

Section: Methodsmentioning

confidence: 99%

Assessing the effects of hybridization and precipitation on invasive weed demography using strength of selection on vital rates

2016

Self Cite

View full text Add to dashboard Cite

BackgroundAs global climate change transforms average temperature and rainfall, species distributions may meet, increasing the potential for hybridization and altering individual fitness and population growth. Altered rainfall specifically may shift the strength and direction of selection, also manipulating population trajectories. Here, we investigated the role of interspecific hybridization and selection imposed by rainfall on the evolution of weedy life-history in non-hybrid (Raphanus raphanistrum) and hybrid (R. raphanistrum x R. sativus) populations using a life table response experiment.ResultsIn documenting long-term population dynamics, we determined intrinsic (r) and asymptotic (λ) population growth rates and sensitivities, a measure of selection imposed on demographic rates. Hybrid populations experienced 8.7-10.3 times stronger selection than wild populations for increased seedling survival. Whereas crop populations generally exhibit little dormancy and wild populations often exhibit dormancy, non-hybrid populations experienced 10% stronger selection than hybrid populations for exhibiting seed dormancy. Selection on survival-to-flowering in wild, not hybrid, populations declined marginally with increasing soil moisture. Hybrid populations exhibited greater r, but not λ, than wild populations regardless of moisture environment. In general, fecundity contributed most to differences in λ but fecundity only contributed positively to hybrid λ relative to wild λ when precipitation was altered (either higher or lower than control) and not under control watering conditions.ConclusionsSelection on key demographic traits may not change dramatically in response to rainfall, and hybridization may more strongly influence the demography of these weedy species than rainfall. If hybrid populations can respond to selection for increased dormancy, this may make it more difficult to deplete weed seed banks and increase the persistence of crop genes in weed populations.

show abstract

Maternal Environment Influences Propagule Pressure of an Invasive Plant, Raphanus raphanistrum (Brassicaceae)

Cited by 14 publications

References 64 publications

The Effect of Altered Soil Moisture on Hybridization Rate in a Crop-Wild System (Raphanus spp.)

The Effect of Altered Soil Moisture on Hybridization Rate in a Crop-Wild System (Raphanus spp.)

Germination rates of weedy radish populations (Raphanus spp.) altered by crop‐wild hybridisation, not human‐mediated changes to soil moisture

Assessing the effects of hybridization and precipitation on invasive weed demography using strength of selection on vital rates

Contact Info

Product

Resources

About