The Relative Importance of Inbreeding and Maternal Sex in Determining Progeny Fitness in Sidalcea oregana SSP. Spicata, A Gynodioecious Plant

Ashman, Tia‐Lynn

doi:10.2307/2410036

Cited by 36 publications

(32 citation statements)

References 30 publications

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“…In other words, there appear to be intrinsic differences in the growth rate of selfed and outcrossed individuals. Moreover, although CVs in the competitive regimen appeared to be greater than those in the non-competitive regimen (see also Karron & Marshall 1990;Ashman 1992), CVs of selfed progeny were not significantly greater than those of outcrossed progeny in the competitive regimen. Our results go against the idea that mixed plantings (a mix of self and outcrossed progeny) should significantly increase the negative effects of inbreeding via either dominance and/or suppression of selfed progeny by outcrossed progeny (Schemske 1983;Schmitt & Ehrhardt 1990), as has been shown experimentally for Anthoxanthum odoratum (Antonovics 1968)and Impatiens capensis (Schmitt & Ehrhardt 1990).…”

Section: Resultsmentioning

confidence: 95%

“…Hence, individuals from female seed-parents might exhibit more inbreeding depression in their own progeny than those from seed-parents that can self. Evidence in support of this hypothesis comes from studies that show that seed-progeny from females exhibit higher levels of inbreeding depression than seed-progeny from males (del Castillo 1993;Ashman 1992). For example, inbreeding depression based on sib-mating versus outcrossing of the two morphs of Sidalcea oregana was estimated as 0.36 for females versus 0.21 for the other morph (calculated from table 6 in Ashman 1992).…”

Section: Resultsmentioning

confidence: 99%

“…Evidence in support of this hypothesis comes from studies that show that seed-progeny from females exhibit higher levels of inbreeding depression than seed-progeny from males (del Castillo 1993;Ashman 1992). For example, inbreeding depression based on sib-mating versus outcrossing of the two morphs of Sidalcea oregana was estimated as 0.36 for females versus 0.21 for the other morph (calculated from table 6 in Ashman 1992). A more explicit test of the hypothesis would require that seeds of male individuals, who themselves were derived from either female or male seed-parents, be compared, as females and males provision their seeds differently (L. Delph unpubl, data).…”

Section: Resultsmentioning

confidence: 99%

“…Lastly, there is a correlation between the presence of females and level of inbreeding among Chionographis populations: populations with no significant inbreeding are hermaphroditic, whereas those with significant inbreeding are gynodioecious (Maki 1992). The second line of investigation involves determining whether selling leads to inbreeding depression in natural populations (Perrot et al 1982;Kesseli & Jain 1984;Kohn 1988;Shykoff 1988;Jolls & Chenier 1989;Sakai et al 1989;Ashman 1992;Maki 1993). This paper estimates inbreeding depression of a long-lived gynodioecious shrub, Hebe subalpina.…”

Section: Introductionmentioning

confidence: 99%

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Inbreeding depression in the gynodioecious shrubHebe subalpina(Scrophulahaceae)

Delph

Lloyd

1996

New Zealand Journal of Botany

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Inbreeding depression in the gynodioecious shrubHebe subalpina(Scrophulahaceae)

Delph

Lloyd

1996

New Zealand Journal of Botany

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“…Thus, hermaphrodites may suffer from inbreeding depression and exhibit reduced fitness compared to females (Ashman 1992;Molina-Freaner and Jain 1993). Resource compensation hypothesis (ii) infers that female and hermaphrodite plants may differ in their resource allocation patterns.…”

Section: Introductionmentioning

confidence: 99%

Sexual differences in response to simulated herbivory in the gynodioecious herb Geranium sylvaticum

2008

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Several factors have been proposed to explain female maintenance in gynodioecious popu- lations. In this study, we propose and test a novel hypothesis: greater tolerance to herbivory through more beneficial interactions with plant fungal mutu- alists might also help to explain female maintenance. Herbivory limits the amount of carbon and nutrients available for the plants and has been shown to affect mycorrhizal colonization. We hypothesized that sim- ulated herbivory would decrease reproductive output, mycorrhizal colonization intensity, and the phospho- rus content relatively more in hermaphrodites, so females would achieve higher advantage over hermaphrodites when under herbivory pressure. We tested it in the field using the gynodioecious plant Geranium sylvaticum. We found that simulated herbivory had a negative effect on the reproductive output in both sexes and that there was a similar reduction in fruit set, seed set, and total seed number in both sexes. Defoliation did not affect any fungal parameter measured, but decreased phosphorus con- tent relatively more in females. The plants had a sex- specific relationship with mycorrhizae, but this was not related to herbivory. Thus, we conclude that females do not gain any specific advantage under defoliation from its symbionts at short-term even though it seems that the plants have sex-specific relationship with their mycorrhizal symbionts

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Coping with potential bi‐parental inbreeding: limited pollen and seed dispersal and large genets in the dioecious marine angiosperm Thalassia testudinum

Tussenbroek

Valdivia-Carrillo

Rodríguez‐Virgen

et al. 2016

Ecology and Evolution

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The high prevalence of dioecy in marine angiosperms or seagrasses (>50% of all species) is thought to enforce cross‐fertilization. However, seagrasses are clonal plants, and they may still be subject to sibling‐mating or bi‐parental inbreeding if the genetic neighborhood is smaller than the size of the genets. We tested this by determining the genetic neighborhoods of the dioecious seagrass Thalassia testudinum at two sites (Back‐Reef and Mid‐Lagoon) in Puerto Morelos Reef Lagoon, Mexico, by measuring dispersal of pollen and seeds in situ, and by fine‐scale spatial autocorrelation analysis with eight polymorphic microsatellite DNA markers. Prevalence of inbreeding was verified by estimating pairwise kinship coefficients; and by analysing the genotypes of seedlings grown from seeds in mesocosms. Average dispersal of pollen was 0.3–1.6 m (max. 4.8 m) and of seeds was 0.3–0.4 m (max. 1.8 m), resulting in a neighborhood area of 7.4 m2 (range 3.4–11.4 m2) at Back‐Reef and 1.9 (range 1.87–1.92 m2) at Mid‐Lagoon. Neighborhood area (Na) derived from spatial autocorrelation was 0.1–20.5 m2 at Back‐Reef and 0.1–16.9 m2 at Mid‐Lagoon. Maximal extensions of the genets, in 19 × 30 m plots, were 19.2 m (median 7.5 m) and 10.8 m (median 4.8 m) at Back‐Reef and Mid‐Lagoon. There was no indication of deficit or excess of heterozygotes nor were coefficients of inbreeding (F IS) significant. The seedlings did not show statistically significant deficit of heterozygotes (except for 1 locus at Back‐Reef). Contrary to our expectations, we did not find evidence of bi‐parental inbreeding in this dioecious seagrass with large genets but small genetic neighborhoods. Proposed mechanisms to avoid bi‐parental inbreeding are possible selection against homozygotes during fecundation or ovule development. Additionally, the genets grew highly dispersed (aggregation index Ac was 0.09 and 0.10 for Back‐Reef and Mid‐Lagoon, respectively); such highly dispersed guerrilla‐like clonal growth form likely increases the probability of crossing between different potentially unrelated genets.

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The Relative Importance of Inbreeding and Maternal Sex in Determining Progeny Fitness in Sidalcea oregana SSP. Spicata, A Gynodioecious Plant

Cited by 36 publications

References 30 publications

Inbreeding depression in the gynodioecious shrubHebe subalpina(Scrophulahaceae)

Inbreeding depression in the gynodioecious shrubHebe subalpina(Scrophulahaceae)

Sexual differences in response to simulated herbivory in the gynodioecious herb Geranium sylvaticum

Coping with potential bi‐parental inbreeding: limited pollen and seed dispersal and large genets in the dioecious marine angiosperm Thalassia testudinum

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