The selfing syndrome: a model for studying the genetic and evolutionary basis of morphological adaptation in plants

Sicard, Adrien; Lenhard, Michael

doi:10.1093/aob/mcr023

Cited by 326 publications

(380 citation statements)

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“…Another factor is the selfing habit of C. hirsuta (Hay et al, 2014). Floral traits often evolve as part of a selfing syndrome because the selective pressure to attract pollinators is relaxed (Sicard and Lenhard, 2011). Therefore, petal number may vary by drift.…”

Section: Petal Number Plasticitymentioning

confidence: 99%

Seasonal Regulation of Petal Number

et al. 2017

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Four petals characterize the flowers of most species in the Brassicaceae family, and this phenotype is generally robust to genetic and environmental variation. A variable petal number distinguishes the flowers of Cardamine hirsuta from those of its close relative Arabidopsis (Arabidopsis thaliana), and allelic variation at many loci contribute to this trait. However, it is less clear whether C. hirsuta petal number varies in response to seasonal changes in environment. To address this question, we assessed whether petal number responds to a suite of environmental and endogenous cues that regulate flowering time in C. hirsuta. We found that petal number showed seasonal variation in C. hirsuta, such that spring flowering plants developed more petals than those flowering in summer. Conditions associated with spring flowering, including cool ambient temperature, short photoperiod, and vernalization, all increased petal number in C. hirsuta. Cool temperature caused the strongest increase in petal number and lengthened the time interval over which floral meristems matured. We performed live imaging of early flower development and showed that floral buds developed more slowly at 15°C versus 20°C. This extended phase of floral meristem formation, coupled with slower growth of sepals at 15°C, produced larger intersepal regions with more space available for petal initiation. In summary, the growth and maturation of floral buds is associated with variable petal number in C. hirsuta and responds to seasonal changes in ambient temperature.

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Section: Petal Number Plasticitymentioning

confidence: 99%

Seasonal Regulation of Petal Number

et al. 2017

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“…The shift to high selfing rates is generally associated with a series of modifications to reproductive traits often beginning with the facility for autonomous self-pollination, and culminating in the evolution of the selfing syndrome [9]. A challenging problem, also shared with work in speciation genetics, is to identify which traits directly initiate the process of mating system change, and which are consequences of increased selfing rates, for example subsequent changes in sex allocation to male function [23].…”

Section: Modification To Reproductive Traits That Promote Selfingmentioning

confidence: 99%

The demography and population genomics of evolutionary transitions to self-fertilization in plants

Barrett

Arunkumar

Wright

2014

Phil. Trans. R. Soc. B

137

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The evolution of self-fertilization from outcrossing has occurred on numerous occasions in flowering plants. This shift in mating system profoundly influences the morphology, ecology, genetics and evolution of selfing lineages. As a result, there has been sustained interest in understanding the mechanisms driving the evolution of selfing and its environmental context. Recently, patterns of molecular variation have been used to make inferences about the selective mechanisms associated with mating system transitions. However, these inferences can be complicated by the action of linked selection following the transition. Here, using multilocus simulations and comparative molecular data from related selfers and outcrossers, we demonstrate that there is little evidence for strong bottlenecks associated with initial transitions to selfing, and our simulation results cast doubt on whether it is possible to infer the role of bottlenecks associated with reproductive assurance in the evolution of selfing. They indicate that the effects of background selection on the loss of diversity and efficacy of selection occur rapidly following the shift to high selfing. Future comparative studies that integrate explicit ecological and genomic details are necessary for quantifying the independent and joint effects of selection and demography on transitions to selfing and the loss of genetic diversity.

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“…Selection for self-pollinating as well as shortening of the stigma compared to close wild relatives such as S. pimpinellifolium has allowed a yield increase (Rick 1977b). This "selfing syndrome" (Sicard and Lenhard 2011) is striking in tomato where a mutation in gene controlling stigma length has been identified in cultivated germplasm (Chen, Cong et al 2007). …”

Section: Tomato Domestication In South Americamentioning

confidence: 99%