The evolution of polymorphic sexual systems in daffodils (<i>Narcissus</i>)

Barrett, Spencer C. H.; Harder, Lawrence D.

doi:10.1111/j.1469-8137.2004.01183.x

Cited by 49 publications

(40 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This condition differs from typical heterostylous species, which usually exhibit both self-and intra-morph incompatibility (Barrett & Cruzan 1993). As a result, in Narcissus floral morphology has a much stronger influence on governing patterns of outcrossed mating and fertility than in heterostylous plants with self-and intra-morph incompatibility (Barrett & Harder 2005).…”

Section: Introductionmentioning

confidence: 83%

Spatial ecology of mating success in a sexually polymorphic plant

2005

View full text Add to dashboard Cite

The spatial context of reproduction is of crucial importance to plants because of their sessile habit. Since pollen and seed dispersal is often restricted, mating success is likely to depend on the quantity and quality of mates in local neighbourhoods. Here we use neighbourhood models to investigate the spatial ecology of pollination and mating in Narcissus assoanus, a sexually polymorphic plant with two mating morphs that differ in style length. By mapping individuals in eight populations from southwestern France, we investigated the influence of the density and morph identity of plants at different spatial scales on variation in female fertility. By using inferences on the expected patterns of pollen transfer based on floral morphology, we were able to predict the quantitative relations between local morph ratios and variation in fertility. Our analyses revealed differences in the spatial clustering of morphs and in their response to plant density and morph identity within local neighbourhoods. Mating success in N. assoanus was characterized by both density-and frequency-dependent processes, a condition that may be a general feature of the spatial ecology of plant mating.

show abstract

Section: Introductionmentioning

confidence: 83%

Spatial ecology of mating success in a sexually polymorphic plant

2005

View full text Add to dashboard Cite

show abstract

“…Thus, it is not surprising that monomorphism has never previously been reported in N. assoanus (Thompson et al 2012). The maintenance of style dimorphism through appropriate levels of disassortative mating might in fact be more common than expected, thereby explaining the prevalence of this mating system in low reciprocal Narcissus species (Barrett, Lloyd & Arroyo 1996;Barrett & Harder 2005).…”

Section: A S S O R T a T I V E A N D D I S A S S O R T A T I V E C R mentioning

confidence: 93%

Long‐tongued insects promote disassortative pollen transfer in style‐dimorphic Narcissus papyraceus (Amaryllidaceae)

Simón‐Porcar

Santos‐Gally

2013

Journal of Ecology

View full text Add to dashboard Cite

Summary1. In hermaphroditic flowers, reciprocal herkogamy, for example heterostyly, enhances pollen transfer between floral morphs (disassortative pollination) while avoiding self-interference between sexual organs. By contrast, disassortative pollination might be compromised in style-dimorphic flowers, which lack perfect reciprocity between the two floral morphs. This suboptimal functioning has been considered to explain why stylar dimorphism is rare in nature.2. Some style-polymorphic species receive a wide array of floral visitors, including long-tongued insects that feed on nectar and short-tongued insects that feed on pollen. Differences in the morphology and behaviour of these two insect types could be manifested as different pollination patterns in each floral morph.3. By observing individual pollinators and pollen deposition and delivery in small field-based experimental arrays with emasculated and intact flowers, we studied pollination patterns mediated by different insect types (long-and short-tongued) in the two floral morphs (long-and short-styled) of the style-dimorphic Narcissus papyraceus. We investigated the patterns of pollen transfer between and within style morphs in cross-pollinations, as well as self-pollination and pollen removal rates, for each floral morph mediated by each insect type.4. Long-tongued insects were efficient pollinators of both floral morphs as they removed little pollen from the anthers but deposited comparatively large amounts on the stigmas. Although disassortative pollen transfer and assortative pollen transfer were equally high to the long-styled morph, the former prevailed in the short-styled morph. Short-tongued insects removed large amounts of pollen from the anthers but deposited only a few pollen grains on the long-styled stigmas and a negligible number of grains on short-styled stigmas regardless of the morph of the donor. 5.Synthesis. In this study, we provide empirical support for the hypothesis that, under the action of long-tongued pollinators, pollen transfer patterns in the stylar-dimorphic Narcissus papyraceus resemble in part those of heterostylous species. In addition, we found that short-tongued insects act mostly as pollen thieves, thereby limiting the male fitness of both style morphs, besides depleting the female fitness of S-morph plants. In view of these results, we propose that the differing pollination efficiencies of floral visitors, in addition to their frequency, are key in determining the morph ratio of populations in this Narcissus.

show abstract

“…Hence, there will be only low levels of selection for complete reciprocity, i.e., an evolution to complete distyly Webb 1992a, 1992b;Barrett et al 2004). Indeed, weak selection on anther height that leads to complete reciprocity and heterostyly seems to be a general picture in the genus, as only one species in this multispecies group shows distyly (Narcissus albimarginatus), whereas several species show a stigma-height dimorphism (Barrett and Harder 2005).…”

Section: International Journal Of Plant Sciencesmentioning

confidence: 98%

Morph Ratio Variation and Sex Organ Reciprocity in Style-DimorphicNarcissus assoanus

Thompson

Cesaro

2012

International Journal of Plant Sciences

View full text Add to dashboard Cite

The maintenance of floral polymorphisms depends on rates and efficiency of cross-pollination within and among mating types in relation to their relative frequency. Here, we examine whether stigma-anther reciprocity in style-dimorphic Narcissus assoanus (populations show either 1 : 1 ratios of long-styled [L-morph] and short-styled [S-morph] plants or significantly L-morph-biased ratios) is correlated with morph ratio variation and whether such differences affect female fitness. In a natural population we created experimental plots of S-morph maternal plants and quantified their female fertility in the presence of either L-morph donors or S-morph donors with only their lower anther levels (we emasculated upper-level anthers). We also quantified floral traits and reciprocity in the positions of stigmas and anthers in 30 natural populations across the species' geographic distribution. We found an increase in seed set on maternal S-morph plants in the presence of L-morph donors and patterns of trait variation that may contribute to enhanced reciprocity with increasing frequency of the S-morph. Subtle differences in the position of sex organs affect pollen transfer and are correlated with morph ratio variation, indicative of frequency-dependent selection.

show abstract

The evolution of polymorphic sexual systems in daffodils (Narcissus)

Cited by 49 publications

References 37 publications

Spatial ecology of mating success in a sexually polymorphic plant

Spatial ecology of mating success in a sexually polymorphic plant

Long‐tongued insects promote disassortative pollen transfer in style‐dimorphic Narcissus papyraceus (Amaryllidaceae)

Morph Ratio Variation and Sex Organ Reciprocity in Style-DimorphicNarcissus assoanus

Contact Info

Product

Resources

About