Distance between pollen donor and recipient influences fruiting success in slickspot peppergrass, <i>Lepidium papilliferum</i>

Robertson, Ian Ross; Ulappa, Amy C.

doi:10.1139/b04-138

Cited by 14 publications

(20 citation statements)

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“…This pattern of percent fruit set as a function of outcrossing distance is similar to that reported by Robertson (2004) and Robertson and Ulappa (2004), although in those studies outcrossing distances between 1 and 75 m were not considered. The rapid increase in percent fruit set we found over relatively short outcrossing distances suggests either that genetic relatedness among individuals declines sharply as a function of distance, or that L. papilliferum, while intolerant of high levels of inbreeding (as experienced in selfing and nearest neighbor pollination treatments), is tolerant of low levels of inbreeding.…”

Section: Discussionsupporting

confidence: 88%

“…The other population had 3602 flowering individuals and was considered large. Only one large population was included in the study because two previous studies had established that populations with over 3000 flowering plants were spatially structured (Robertson 2004;Robertson and Ulappa 2004). The large population was included for comparison with the previous studies, and as a control for year in our comparisons between large and small populations.…”

Section: Study Sitesmentioning

confidence: 99%

“…Studying three relatively large populations of L. papilliferum (>3000 flowering individuals), Robertson and Ulappa (2004) analyzed fruit set as a function of outcrossing distance and concluded that those populations were spatially structured. Self pollination resulted in only 12% fruit set, whereas fruit set jumped significantly to 45% for pollination distances of 75-100 m. Although these results shed light on the spatial structure of large L. papilliferum populations, most populations of this rare species are substantially smaller and, in some cases, more isolated than those used by Robertson and Ulappa.…”

Section: Introductionmentioning

confidence: 99%

“…Our second goal was to determine whether L. papilliferum exhibits inbreeding depression. Although fruit production, the only measure of reproduction used by Robertson and Ulappa (2004), may be an important component of a plant's reproductive success, offspring from crosses that yield similar amounts of fruit may differ in other ways that affect parental fitness. Consideration of seed mass, germination success, and seedling growth can contribute to a more comprehensive picture of reproductive performance (Waser and Price 1989;Waser 1993;Oostermeijer et al 1995;Byers 1998).…”

Section: Introductionmentioning

confidence: 99%

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Spatial structure and inbreeding depression in slickspot peppergrass, Lepidium papilliferum (Brassicaceae)

Billinge

Robertson

2008

Botany

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Abstract:In plants with limited pollen and seed dispersal, populations are often spatially structured such that neighboring individuals are more closely related to one another than to distant individuals. Mating among close relatives, including selfing, may lead to a reduction in reproductive performance through the effects of prezygotic mating barriers and inbreeding depression. Studying 11 populations of slickspot peppergrass, Lepidium papilliferum (L.F. Hend.) A. Nels. and J.F. Macbr (Brassicaceae), a rare mustard endemic to southwestern Idaho, we investigated whether small populations (16-746 flowering individuals) exhibit spatial structure as previously reported for large populations (>3000 flowering individuals). Through hand-pollination experiments we found that percent fruit set increased with increasing distance between parents up to a distance of 3 m, and declined slightly but nonsignificantly at greater outcrossing distances. Self-pollinated plants produced little or no fruit. Germination of seeds from the hand-pollination experiment revealed signs of inbreeding depression in the offspring. Specifically, leaf length of developing seedlings increased significantly as a function of outcrossing distance. Total leaf number showed a similar, yet statistically nonsignificant, response to outcrossing distance. Overall, our experiments reveal spatial structuring and suggest the occurrence of inbreeding depression in small populations of L. papilliferum.Key words: inbreeding depression, outcrossing, pollination, spatial structure. Résumé :Chez les plantes ayant des dispersions de pollens et de graines limitées, on retrouve souvent des populations structurées de telle façon que les individus voisins se côtoient plus étroitement que les individus distants. Les croisements entre individus étroitement apparentés, incluant l'autofécondation, peuvent conduire à une réduction des performances de reproduction par les effets de barrières de croisement pré-zygotiques et la dépression d'autofécondation. En étudiant 11 populations de la lépidie papillée, Lepidium papilliferum (L.F. Hend.) A. Nels et J.F. Macbr (Brassicaceae), une moutarde endémique rare du sud-ouest de l'Idaho, les auteurs ont cherché à savoir si les petites populations (16 à 746 individus fleurissants) montrent une structure de population comme précédemment rapportée pour de grandes populations (>3000 individus florissants). À l'aide d'expériences de pollinisation, ils ont constaté que le pourcentage de mise à fruit augmente avec une augmentation de la distance entre les parents jusqu'à 3 m, et diminue légèrement, mais de façon non significative pour des distances de croisements externes plus grandes. Les plantes autofécondées produisent peu ou pas de fruits. La germination des graines provenant de pollinisations manuelles montre des signes de dépression d'autofécondation chez les descendants. Spécifiquement, la longueur des feuilles des plantules en développement augmente significativement en fonction de l'augmentation de la distance des autofécondation...

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Section: Discussionsupporting

confidence: 88%

Section: Study Sitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial structure and inbreeding depression in slickspot peppergrass, Lepidium papilliferum (Brassicaceae)

Billinge

Robertson

2008

Botany

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“…Parmi les principales causes d'échec, Wilcock et Neiland (2002) mentionnent : une faible production ou une mauvaise dispersion du pollen, une prédation par les insectes, une perte dans l'environnement ou une déhiscence incomplète de l'anthère. Chez les espèces anémophiles, une mise à fruit déficiente est habituellement causée par l'insuffisance de pollen associée à une faible densité végétale (Robertson et Ulappa 2004). Chez les espèces entomophiles, c'est un manque de pollinisateurs, attribuable à la destruction de leurs habitats ou aux conditions climatiques défavorables à leur activité, qui explique ce phénomène (Thompson 2001).…”

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Impact d’un apport supplémentaire de pollen sur la mise à fruit de Sambucus nigra subsp. canadensis (L.) R. Bolli

Guilmette¹,

Richer²,

Rioux³

et al. 2007

Can. J. Plant Sci.

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Relationships between the floral neighborhood and individual pollen limitation in two self-incompatible herbs

2009

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Local flower density can affect pollen limitation and plant reproductive success through changes in pollinator visitation and availability of compatible pollen. Many studies have investigated the relationship between conspecific density and pollen limitation among populations, but less is known about within-population relationships and the effect of heterospecific flower density. In addition, few studies have explicitly assessed how the spatial scales at which flowers are monitored affect relationships. We investigated the effect of floral neighborhood on pollen limitation at four spatial scales in the self-incompatible herbs Armeria maritima spp. maritima and Ranunculus acris spp. acris. Moreover, we measured pollen deposition in Armeria and pollinator visits to Ranunculus. There was substantial variation in pollen limitation among Armeria individuals, and 25% of this variation was explained by the density of compatible and heterospecific flowers within a 3 m circle. Deposition of compatible pollen was affected by the density of compatible and incompatible inflorescences within a 0.5 m circle, and deposition of heterospecific pollen was affected by the density of heterospecific flowers within a 2 m circle. In Ranunculus, the number of pollinator visits was affected by both conspecific and heterospecific flower densities. This did not, however, result in effects of the floral neighborhood on pollen limitation, probably due to an absence of pollen limitation at the population level. Our study shows that considerable variation in pollen limitation may occur among individuals of a population, and that this variation is partly explained by floral neighborhood density. Such individual-based measures provide an important link between pollen limitation theory, which predicts ecological and evolutionary causes and consequences for individual plants, and studies of the effects of landscape fragmentation on plant species persistence. Our study also highlights the importance of considering multiple spatial scales to understand the spatial extent of pollination processes within a population.

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Distance between pollen donor and recipient influences fruiting success in slickspot peppergrass, Lepidium papilliferum

Cited by 14 publications

References 23 publications

Spatial structure and inbreeding depression in slickspot peppergrass, Lepidium papilliferum (Brassicaceae)

Spatial structure and inbreeding depression in slickspot peppergrass, Lepidium papilliferum (Brassicaceae)

Impact d’un apport supplémentaire de pollen sur la mise à fruit de Sambucus nigra subsp. canadensis (L.) R. Bolli

Relationships between the floral neighborhood and individual pollen limitation in two self-incompatible herbs

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