Corolla wilting facilitates delayed autonomous self-pollination in Pedicularis dunniana (Orobanchaceae)

Sun, Shi‐Guo; Guo, Yingshi; Gituru, Robert Wahiti; Huang, Shuyin

doi:10.1007/s00606-004-0260-x

Cited by 45 publications

(43 citation statements)

References 27 publications

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“…Still other experimental tests have eliminated the presumed agent of delayed selfing and quantified effects on seed set. For example, Sun et al (2005) secured corollas with threads to prevent pendulous wilting in a species of Pedicularis and found reduced self seed set, and a wind-exclusion experiment provided evidence for wind-dragged corolla abscission in Incarvillea sinensis (Qu et al, 2007).…”

Section: Experimental Support For Delayed Selfingmentioning

confidence: 99%

“…When a trait takes on a different function in a derived species, we might expect it to have been altered in some way to accomplish the new task (Gould and Vrba, 1982). Sun et al (2005) raise this possibility with respect to the corolla-wilting mechanism of delayed selfing in Pedicularis dunniana (Orobanchaceae). Among a number of species studied in the largely outcrossing genus, P. dunniana is unusual in that its corolla remains attached for a longer period, perhaps extending the opportunity for delayed selfing.…”

Section: Evolution Of Delayed Selfing Traitsmentioning

confidence: 99%

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The best of both worlds? A review of delayed selfing in flowering plants

Goodwillie

Weber

2018

American J of Botany

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In a series of seminal papers, David G. Lloyd (1979;Lloyd and Schoen, 1992) provided new insight into plant mating-system evolution by recognizing that the selective consequences of selfand cross-pollination and fertilization depend on the specifics of how and when they occur. In phenotypic models, Lloyd showed that the conditions that select for self-fertilization (selfing) facilitated by pollinators differ from those for selfing that occurs autonomously. Further, the selective consequences of autonomous selfing were shown to depend on its timing in anthesis in relation to cross-fertilization (outcrossing). The theory predicts that selfing that occurs after opportunities for outcrossing have passed (delayed selfing) should be selected under the broadest range of conditions.In general, selection of selfing is expected to be opposed by inbreeding depression, the reduced fitness of selfed progeny that results primarily from the expression of deleterious recessive alleles Charlesworth, 1987, Charlesworth andWillis, 2009). Counteracting the cost of inbreeding depression is the 50% genetic transmission advantage of selfing, which occurs because INVITED SPECIAL ARTICLE The best of both worlds? A review of delayed selfing in flowering plantsCarol Goodwillie 1,3 and Jennifer J. Weber PREMISE OF STUDY:In a seminal body of theory, Lloyd showed that the fitness consequences of selfing will depend on its timing in anthesis. Selfing that occurs after opportunities for outcrossing or pollen dispersal can provide reproductive assurance when pollinators are limited and is expected to incur little cost, even when inbreeding depression is high. As a result, delayed selfing is often interpreted as a "best-of-both-worlds" mating system that combines the advantages of selfing and outcrossing. METHODS:We surveyed 65 empirical studies of delayed selfing, recording floral mechanisms and examining information on inbreeding depression, autofertility, and other parameters to test the support for delayed selfing as a best-of-both-worlds strategy.KEY RESULTS: Phylogenetic distribution of the diverse floral mechanisms suggests that some basic floral structures may predispose plant taxa to evolve delayed selfing. Delayed selfing appears to serve as a best-of-both-worlds strategy in some but not all species. While the capacity for autonomous selfing is often high, it is lower, in some cases, than in related species with earlier modes of selfing. In other delayed-selfers, low inbreeding depression and reduced investment in corollas and pollen suggest limited benefits from outcrossing.CONCLUSIONS: Despite a growing literature on the subject, experimental evidence for delayed selfing is limited and major gaps in knowledge remain, particularly with respect to the stability of delayed selfing and the conditions that may favor transitions between delayed and earlier selfing. Finally, we suggest a potential role of delayed selfing in facilitating transitions from self-incompatibility to selfing.

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Section: Experimental Support For Delayed Selfingmentioning

confidence: 99%

Section: Evolution Of Delayed Selfing Traitsmentioning

confidence: 99%

The best of both worlds? A review of delayed selfing in flowering plants

Goodwillie

Weber

2018

American J of Botany

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“…Chernov (1985) argued that Pedicularis in Russia was changing from an entomophilous genus to a self-pollinating genus because of a lack of pollinators and that the flowers of the Pedicularis species have not yet had time to lose their more advanced characteristics of entomophily. Sun et al (2005) also reported that P. dunniana can accomplish autonomous self-pollination due to corolla wilting when pollinators are absent. To detect the exact reason for abnormal pollen-ovule ratio value in Pedicularis, detailed studies on mating system for certain species are urgently needed.…”

Section: Pollen-ovule Ratio In Pedicularismentioning

confidence: 93%

Pollen‐Ovule Ratio and Gamete Investment in Pedicularis (Orobanchaceae)

Yang¹,

Guo²

2007

JIPB

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The Pedicularis species provides ideal materials to study floral evolution because of their substantial flower variation based on a narrow genetic basis, even though they are almost exclusively pollinated by bumblebee. These traits allow us to detect the evolutionary trends of floral parameters without considering genetic background and the difference of pollination vectors. The pollen-ovule ratio is widely used to estimate the pattern of resource investment in two sexual functions in flowering plants. Forty species representing all of the corolla types in Pedicularis were used to study pollen-ovule ratio, gamete investment, and their correlations. Results show that pollen-ovule ratio does not differ among both different corolla types and taxonomic groups. It is therefore suggested that pollen-ovule ratio should be a parallel evolution. The correlations between pollen-ovule ratio and pollen size (-), and ovule size (+) can be successfully explained in terms of sex allocation theory. The biological significance of such relationships was also discussed. Additionally, we analyzed the pattern of resource investment into female gamete, which has been somewhat neglected, and found that plants have different patterns of gamete investment between the two sexual functions.

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“…In many angiosperms, floral structures can undergo dramatic movements over relatively short periods of time and can influence plant pollination and mating systems, including pistil (style) movement (Schlessman 1986, Fetscher & Kohn 1999, Li et al 2001, Yu & Huang 2006, Zhang & Li 2008, Ruan et al 2010, stamen (filament, anther, pollen) movement (Darwin 1862, Schlessman 1986, Kalisz et al 1999, Edwards et al 2005, Liu et al 2006, and corolla closure (Juncosa & Webster 1989, Bynum & Smith 2001, Ruan et al 2005, Sun et al 2005, Carrió et al 2008). Since Darwin (1862) noted that reconfiguration of pollinia in orchids avoids self-pollination (Peter & Johnson 2006), various hypotheses have been proposed to explain the adaptive significance of floral movements.…”

Section: Introductionmentioning

confidence: 99%

Floral morphology and mating system of Alcea rosea (Malvaceae)

Qun¹

2012

Plecevo

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Background and aims -Variations in floral traits and floral structures influence mating systems. The flowers of Alcea rosea are protandrous and herkogamous, with style curvature at anthesis. Methods -We measured: (1) floral morphology, including style curvature, (2) stigma receptivity and pollen viability, (3) breeding system, and (4) outcrossing rate estimated by ISSR markers. Key results -Results indicate that when stigmas were in contact with anthers via style curvature, stigma receptivity and pollen viability was 89.7 and 42.33%, respectively, indicating the potential of delayed selfing. Delayed selfing in A. rosea did not provide obvious contribution to seed production, because there was no significant difference in seed set between intact and emasculated open flowers (P = 0.765). However, successful reproduction of 23.98% flowers in the absence of pollinators suggested that selfing provides reproductive assurance during a year, in which pollinators were limiting. The multilocus outcrossing rates in different populations varied from 0.972 to 0.981, with a mean of 0.977. Conclusion -Our data provide an empirical demonstration of a predominantly outcrossing species with potential delayed selfing when pollinators are absent or scarce.

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Corolla wilting facilitates delayed autonomous self-pollination in Pedicularis dunniana (Orobanchaceae)

Cited by 45 publications

References 27 publications

The best of both worlds? A review of delayed selfing in flowering plants

The best of both worlds? A review of delayed selfing in flowering plants

Pollen‐Ovule Ratio and Gamete Investment in Pedicularis (Orobanchaceae)

Floral morphology and mating system of Alcea rosea (Malvaceae)

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