Early-acting inbreeding depression and reproductive success in the highbush blueberry, Vaccinium corymbosum L.

Krebs, Stephen L.; Hancock, James F.

doi:10.1007/bf00224252

Cited by 77 publications

(86 citation statements)

References 30 publications

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“…High seed-set values could arise from crosses among unrelated individuals, with those among closely related individuals giving lower levels of seed-set. Such correlations between the degree of relatedness of individuals and the fertility of crosses have been demonstrated elsewhere by Krebs & Hancock (1990) and Seavey & Carter (1994).…”

Section: F/oral Form and Functionsupporting

confidence: 71%

Sexual polymorphisms in Narcissus triandrus (Amaryllidaceae): is this species tristylous?

et al. 1997

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The sexual polymorphism tristyly is well documented in three flowering plant families (Lythraceae, Oxalidaceae and Pontederiaceae). Controversy has arisen as to whether the polymorphism exists in Narcissus triandrus L. of the Amaryllidaceae. Surveys of floral variation in 80 populations in Spain and Portugal were undertaken to determine the nature of sexual polymorphisms in the species. Most populations (85 per cent) contained three discrete floral morphs that differ from one another in the sequence in which the stigma and the two anther levels within a flower are presented. Hence, the species is genuinely tristylous. Floral morph frequencies deviated strongly from the isoplethic expectations (1:1:1) typical of tristylous species. Average frequencies for the morphs were L morph =0.59, M morph = 0.19 and S morph = 0.22. In 15 per cent of the populations sampled, the mid-styled morph was absent. Controlled crosses indicated that individuals are moderately self-sterile but cross-compatible with other individuals, regardless of morph. Therefore, the species does not possess a conventional heteromorphic incompatibility system. Self-sterility operates in the ovary, and prior selfpollination of flowers renders ovules nonfunctional as judged by reduced seed-set in subsequent cross-pollinations. Multilocus outcrossing estimates in four tristylous populations averaged t = 0.77, range 0.68-0.87, with significant variation evident among morphs but not populations. All population estimates were less than 1, indicating significant amounts of selfing. Although N triandrus is clearly tristylous, the expression of the polymorphism is unique among tristylous families.

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Section: F/oral Form and Functionsupporting

confidence: 71%

Sexual polymorphisms in Narcissus triandrus (Amaryllidaceae): is this species tristylous?

et al. 1997

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“…Evidence of inhibition of cross-pollen by self-pollen has been also shown for Asclepia syriaca by Morse ( 1994) and for Asclepia exalta by Broyles and Wyatt (1995). In natural conditions low seed set is determined both by pollen efficiency (quantity and quality) and maternal resource availability (Broyles and Wyatt, 1995 Krebs and Hancock ( 1990) (Stephenson and Bertin, 1983;Schlichting and Devlin, 1989; Snow, 1990), pollen performance of a particular genotype depends on the recipient plant. These results could be interpreted as a variable level of compatibility between different genotypes attributed to the existence of a self-incompatibility system.…”

Section: Discussionmentioning

confidence: 88%

Self- and cross-pollination effects on pollen tube growth and seed set in holm oak Quercus ilex L (Fagaceae)

Yacine

Bouras

1997

Ann. For. Sci.

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Summary -Patterns of the self-incompatibility system have been more often described for hermaphroditic, entomophilous and short-lived plant species. Quercus ilex is a long-lived, monoecious, anemophilous and highly self-incompatible species. We used pollination experiments to investigate phenotypic responses of the self-incompatibility system. Flowers from 14 individuals of the same stand were hand-pollinated with self-pollen, cross-pollen from a single donor and a mixture of the two types. We observed a slower pollen tube growth and no or nearly no seed production after self-pollination. The more self-pollen tubes reach the style, the more flowers will stop their ovule development, resulting in a high flower abortion rate. In open pollination, pollen load is not a limiting factor, but incompatible pollen may reach stigma simultaneously or before compatible cross-pollen, which will induce an early abortion of flowers. When pollination is qualitatively and quantitatively effective, the regulation of seed production related to the resources availability acts by the late abortion of fruit.self-incompatibility / pollen tube growth / seed set / Quercus ilex L Résumé -Effets de l'auto-et de l'allopollen sur la croissances des tubes polliniques et la production de fruits chez le chêne vert (Quercus ilex L). Les

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“…also be reduced. A reduction in pollen stainability as an estimate of male function has been reported following selfing (Ritland & Ganders, 1987;Krebs & Hancock, 1990;Willis, 1993b), but we are unaware of other published studies where pollen production was used to compare self and outcross progeny.…”

Section: Discussionmentioning

confidence: 98%

“…Dudash, 1990;Johnston, 1992), but the measurement of inbreeding depression has been biased toward quantifying female function, partly because of the ease of data collection. Some data on pollen viability have been reported for Medicago (Dziubenko, 1983), Mimulus guttatus (Ritland & Ganders, 1987;Willis, 1993b), and Vaccinium coymbosum (Krebs & Hancock, 1990), but we still lack information on the effects of selfing on pollen production. Examining components of male and female function such as the production of pollen and ovules allows us to quantify the effects of inbreeding depression on potential gamete production beyond the commonly used fitness parameters such as total flower number per individual or a measurement of overall size, which is often significantly correlated to flower number (e.g.…”

Section: Introductionmentioning

confidence: 97%

Inbreeding depression under a competitive regime in Mimulus guttatus: consequences for potential male and female function

Carr

Dudash

1995

Heredity

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The effects of one generation of selfing and outcrossing on six life history characters were examined in the greenhouse for two populations of the mixed-mating species Mimulus guttatus. Inbreeding depression was not detected in the mass of seed produced by maternal plants, but selfing significantly reduced germination success by 13-20 per cent relative to outcross seeds. Seedlings produced by self-pollination were 26-3 1 per cent smaller than outcross progeny. Late life history stages were examined under varied competitive regimes in which each plant was grown with a neighbour of either an inbred or outbred individual. Progeny resulting from seif-pollinations showed a 14-30 per cent reduction in ovule number per locule, and their pollen production per flower was reduced by 28-33 per cent. Adult above-ground biomass showed the greatest inbreeding depression, ranging from 24-50 per cent depending on the competitive conditions. Thus progeny resulting from selfing are smaller as adults and contribute significantly fewer potential gametes into the gene pooi as pollen grains and ovules. The multiplicative effects of these characters is calculated. For all traits except ovule number, outcross progeny from parents of the same population did not differ significantly from outcross progeny produced by parents that came from populations separated by 10 km, suggesting relatively little differentiation between populations. The relative performance of self and outcross progeny in later life history stages was independent of the relative performance observed in earlier stages.Keywords: competition, inbreeding depression, mating system, Mimulus guttatus, ovule production, pollen production.Although inbreeding depression has been estimated in many species (e.g. Schemske, 1983;Schoen, 1983; reviewed by Charlesworth & Charlesworth, 1987;Ritland & Ganders, 1987;Svensson, 1988;Griffing, 1989;Levin, 1989;Dudash, 1990; Holtsford & Elistrand, 1990;Fenster, 1991b;Johnston, .1992;Agren & Schemske, 1993) more information is needed on how the genetic makeup of immediate neighbours can affect the relative performance of self and outcross progeny and how the expression of inbreeding depression varies across life history traits.

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Early-acting inbreeding depression and reproductive success in the highbush blueberry, Vaccinium corymbosum L.

Cited by 77 publications

References 30 publications

Sexual polymorphisms in Narcissus triandrus (Amaryllidaceae): is this species tristylous?

Sexual polymorphisms in Narcissus triandrus (Amaryllidaceae): is this species tristylous?

Self- and cross-pollination effects on pollen tube growth and seed set in holm oak Quercus ilex L (Fagaceae)

Inbreeding depression under a competitive regime in Mimulus guttatus: consequences for potential male and female function

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