Inbreeding depression and the outcrossing rate in natural populations of Allium schoenoprasum L. (wild chives)

Stevens, J P; Bougourd, Susan M.

doi:10.1038/hdy.1988.40

Cited by 56 publications

(41 citation statements)

References 20 publications

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“…Complete or selective abortion of ovules was observed in S. sesban, S. kinensis and S. geotzei (Heering, 1994). This phenomenon was also reported by Stevens and Bougourd (1988), when they estimated as 0.91 for Allim schoenoprasum L. that is, a clonal, selfcompatible hermaphrodite plant with apparently ample opportunities for geitonogamous selfing. Barnes et al (1972) reported that the frequency of ovule abortion is greater in zygotes and embryos resulting from selfpollination than from cross-pollination.…”

Section: Discussionsupporting

confidence: 52%

The mating system of <i>Sesbania sesban</i> (L.) Merr. (Leguminosae)

Gebremariam

Nemomissa

Demissie

et al. 2002

SEJS

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ABSTRACT:The mating system of Sesbania sesban was studied using one natural population and two cultivated populations. A large number of progeny (600) was assayed from each population for one polymorphic locus of Malate dehydrogenase (Mdh). The level of out-crossing in the studied populations ranged from 40-100%. The genotype frequencies were in agreement with those of the Hardy-Weinberg expected genotype proportions as in randomly mating populations at P < 0.05. The floral structure and the pollen shedding behaviour of the flowers of S. sesban could favour cross-pollination and/or self-pollination depending on the circumstances. Self-pollination usually occurs late in the flowering period when pollinators fail to visit the flowers. Such a "delayed selfing" facilitates out-crossing in the presence of appropriate pollinators under natural conditions, but confers a selective advantage where pollinators are limiting. The results indicated that S. sesban could be self-fertilized in the absence of pollinators or could out-cross with other heterozygous individuals in the neighboring population when suitable pollinators are available. S. sesban exhibits "facultative xenogamy" or "delayed selfing" and is a mixed mating species.

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Section: Discussionsupporting

confidence: 52%

The mating system of <i>Sesbania sesban</i> (L.) Merr. (Leguminosae)

Gebremariam

Nemomissa

Demissie

et al. 2002

SEJS

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“…In some plant species, seed weight is a good indicator of seed viability and seedling growth rate (Stanton, 1984), although Stevens and Bougourd (1988) did not find such a relation in Allium schoenoprasum. We compared cross-fertilization and self-fertilization to find out whether there was a different weight investment in capsules in L.…”

Section: Discussionmentioning

confidence: 99%

“…Self-fertilization and inbreeding depression have been widely studied, from both a theoretical and an empirical point of view (Lloyd, 1979;Lande and Schemske, 1985;Charlesworth and Charlesworth, 1987;Holsinger, 1988;Schemske and Lande, 1985;Stevens and Bougourd, 1988). Most studies are limited to plants.…”

Section: Introductionmentioning

confidence: 99%

Inbreeding depression and self-fertilization in Lymnaea peregra (Gastropoda: Pulmonata)

Jarne

Delay

1990

Heredity

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The effects of self-fertilization and cross-fertilization on several fitness traits were examined in the freshwater hermaphrodite snail Lymnaea peregra. Laboratory strains were established from Lake Geneva populations. Comparisons of F2 snails and their offspring showed that there are no differences in hatching time, nor in the size of young snails monitored over one month. But there was a significant difference, when the distribution of the capsule weight against the number of eggs was compared, although the effects of this on fitness are probably small. There was also a significant difference for egg production and juvenile viability over one month; the selfing snails are 94 per cent less fit for these two traits than the outcrossing.

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“…Fecundity estimates of plants which survived to reproduce, and fitness estimates for all plants, as in Table 6. 1979; Price and Waser, 1979;Gouyon and Vemet, 1980;Schemske, 1983;Jolls, 1984;Kesseli and Jain, 1984;Levin, 1984;Schemske and Pautler, 1984;Harder et al, 1985;Stevens and Bougourd, 1988), but some exceptions are known where seed set following self-pollinations was not less than seed set ofoutcrossed flowers (Schoen, 1983;Karron, 1989).…”

Section: Discussionmentioning

confidence: 99%

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

1990

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Abstract. -Inbreeding depression is commonly observed in natural populations. The deleterious effects of forced inbreeding are often thought to be less pronounced in populations with seifpollinating mating systems than in primarily outcrossing populations. We tested this hypothesis by comparing the performance of plants produced by artificial self-and cross-pollination from three populations whose outcrossing rate estimates were 0.03, 0.26, and 0.58. Outcrossing rates and inbreeding coefficients were estimated using isozyme polymorphisms as genetic markers. Analysis of F statistics suggests that biparental inbreeding as well as self-fertilization contribute to the level of homozygosity in the seed crop. Biparental inbreeding will reduce the heterozygosity of progeny produced by outcrossing, relative to random outcrossing expectations, and hence will reduce the effects of outcrossing versus self-fertilization. Heterotic selection may increase the average heterozygosity during the life history. Selfed and outcrossed seeds from all three populations were equally likely to germinate and survive to reproduce. However, inbreeding depression was observed in fecundity traits of plants surviving to reproduction in all three populations. Even in the population whose natural self-fertilization rate was 97%, plants grown from seed produced by self-pollination produced fewer fruits and less total seed weight than plants grown from outcrossed seed. There was no detectable inbreeding depression in estimated lifetime fitness. Inbreeding effects for all reproductive yield characters were most severe in the accession from the most outcrossing population and least severe in the accession from the most self-fertilizing population.

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Inbreeding depression and the outcrossing rate in natural populations of Allium schoenoprasum L. (wild chives)

Cited by 56 publications

References 20 publications

The mating system of <i>Sesbania sesban</i> (L.) Merr. (Leguminosae)

The mating system of <i>Sesbania sesban</i> (L.) Merr. (Leguminosae)

Inbreeding depression and self-fertilization in Lymnaea peregra (Gastropoda: Pulmonata)

INBREEDING EFFECTS IN CLARKIA TEMBLORIENSIS (ONAGRACEAE) POPULATIONS WITH DIFFERENT NATURAL OUTCROSSING RATES

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