Self- and Cross-Fertilization in Plants. II. The Selection of Self- Fertilization

Lloyd, David G.

doi:10.1086/297041

Cited by 693 publications

(842 citation statements)

References 27 publications

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“…Differences among treatments were highly significant (Friedman's anova v 2 = 9.48, n = 7, df = 2, P = 0.009); post-hoc comparisons demonstrated significant differences only between the controls and each of the treatments (P < 0.001 in both cases). The self-compatibility index was 1.4 ± 0.7 (n = 82 flowers), samples with indices >0.75 being described as self-compatible (Lloyd 1992). For both selfed and cross-pollinated flowers, growth of pollen tubes commenced between 24 and 48 h after pollination, with no obvious difference in speed of growth between selfed and cross-pollinated flowers.…”

Section: Breeding Systemmentioning

confidence: 92%

Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Griffiths¹,

Tsvuura²,

Franklin³

et al. 2010

Plant Biology

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Synchronous monocarpy in long‐lived plants is often associated with pollination by wind, in part because infrequent mass flowering may satiate pollinators. Selfing in synchronous monocarps may provide reproductive assurance but conflict with the benefits of outcrossing, a key evolutionary driver of synchrony. We predicted that animal‐pollinated species with synchronous flowering would have unspecialised flowers and attract abundant generalised pollinators, but predictions for selfing and outcrossing frequencies were not obvious. We examined the pollination biology of Isoglossa woodii (Acanthaceae), an insect‐pollinated, monocarpic herb that flowers synchronously at 4–7‐year intervals. The most frequent visitor to I. woodii flowers was the African honeybee, Apis mellifera adansonii. Hand‐pollination failed to enhance seed production, indicating that the pollinators were not saturated. No seed was set in the absence of pollinators. Seed set was similar among selfed and outcrossed flowers, demonstrating a geitonogamous mixed‐mating strategy with no direct evidence of preferential outcrossing. Flowers contained four ovules, but most fruits only developed one seed, raising the possibility that preferential outcrossing occurs by post‐pollination processes. We argue that a number of the theoretical concerns about geitonogamous selfing as a form of reproductive assurance do not apply to a long‐lived synchronous monocarp such as I. woodii.

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Section: Breeding Systemmentioning

confidence: 92%

Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Griffiths¹,

Tsvuura²,

Franklin³

et al. 2010

Plant Biology

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“…As far as we know, this is the first characterization of prior selfing in animals. Prior selfing has otherwise been detected, and largely studied, in plants (Lloyd, 1992;Davis & Delph, 2005). Pulmonate snails produce both sperm and ovules in a single reproductive structure referred to as the ovotestis, and selffertilization occurs within the hermaphroditic part of the reproductive tracts (see , while cross-fertilization requires copulation.…”

Section: (C) Limited Mating Activitymentioning

confidence: 99%

“…However, this does not tell us why prior selfing has evolved in B. pfeifferi. Using a general phenotypic model, Lloyd (1992) showed that prior selfing may evolve when inbreeding depression is not too high (i.e. <0 .…”

Section: (C) Limited Mating Activitymentioning

confidence: 99%

“…In plants, selfing can result from competition between outcross and selfed pollen (competitive selfing), can occur prior to outcrossing (prior selfing), or can be delayed until after all opportunities for outcrossing have been expended (delayed selfing ; Lloyd, 1979Lloyd, , 1992. There is ample evidence for these three selfing modes in plants.…”

Section: Introductionmentioning

confidence: 99%

“…Prior selfing might be selected when the probability of being outcrossed is low (e.g. pollination or partner limitation) and/or inbreeding depression is weak (Lloyd, 1992). A second goal of this work was to test for the occurrence of prior selfing in an animal species, and to propose some explanations for its evolution.…”

Section: Introductionmentioning

confidence: 99%

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Prior selfing and the selfing syndrome in animals: an experimental approach in the freshwater snailBiomphalaria pfeifferi

et al. 2008

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SummaryInbreeding species of hermaphroditic animals practising copulation have been characterized by few copulations, no waiting time (the time that an isolated individual waits for a partner before initiating reproduction compared with paired individuals) and limited inbreeding (self-fertilization) depression. This syndrome, which has never been fully studied before in any species, is analysed here in the highly selfing freshwater snail Biomphalaria pfeifferi. We conducted an experiment under laboratory conditions over two generations (G 1 and G 2 ) using snails sampled from two populations (100 individuals per population). G 1 individuals were either isolated or paired once a week (potentially allowing for crosses), and monitored during 29 weeks for growth, fecundity and survival. Very few copulations were observed in paired snails, and there was a positive correlation in copulatory activity (e.g. number of copulations) between the male and female sexual roles. The waiting time was either null or negative, meaning that isolated individuals initiated reproduction before paired ones. G 2 offspring did not differ in hatching rate and survival (to 28 days) between treatments, but offspring from paired individuals grew faster than those from isolated individuals. On the whole, the self-fertilization depression was extremely low in both populations. Another important result is that paired G 1 individuals began laying (selfed) eggs several weeks prior to initiating copulation : this is the first characterization of prior selfing (selfing initiated prior to any outcrossing) in a hermaphroditic animal. A significant population effect was observed on most traits studied. Our results are discussed with regard to the maintenance of low outcrossing rates in highly inbreeding species.

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Evolution of the Mating System in Colonizing Plants

Pannell

2016

Invasion Genetics

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Self- and Cross-Fertilization in Plants. II. The Selection of Self- Fertilization

Cited by 693 publications

References 27 publications

Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Pollination ecology of Isoglossa woodii, a long‐lived, synchronously monocarpic herb from coastal forests in South Africa

Prior selfing and the selfing syndrome in animals: an experimental approach in the freshwater snailBiomphalaria pfeifferi

Evolution of the Mating System in Colonizing Plants

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