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Related Concept Videos

Frequency-dependent Selection01:21

Frequency-dependent Selection

When the fitness of a trait is influenced by how common it is (i.e., its frequency) relative to different traits within a population, this is referred to as frequency-dependent selection. Frequency-dependent selection may occur between species or within a single species. This type of selection can either be positive—with more common phenotypes having higher fitness—or negative, with rarer phenotypes conferring increased fitness.Positive Frequency-Dependent SelectionIn positive...
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Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
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Related Experiment Video

Updated: Jul 1, 2026

Determination of Self-(In)compatibility and Inter-(In)compatibility Relationships in Citrus Using Manual Pollination, Microscopy, and S-Genotype Analyses
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Published on: June 30, 2023

RNase-based self-incompatibility: puzzled by pollen S.

Ed Newbigin1, Timothy Paape, Joshua R Kohn

  • 1School of Botany, University of Melbourne, VIC 3010, Australia. edwardjn@unimelb.edu.au

The Plant Cell
|September 9, 2008
PubMed
Summary
This summary is machine-generated.

Plant self-incompatibility relies on S-RNase and F-box proteins (SLF/SFB). Contrary to expectations, these genes do not consistently coevolve, challenging our understanding of S-locus evolution.

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Area of Science:

  • Plant reproductive biology
  • Molecular evolution
  • Genetics

Background:

  • Plant self-incompatibility systems prevent self-fertilization through genetically controlled pollen rejection.
  • S-locus genes, including pollen-expressed SLF/SFB and style-expressed S-RNase, determine S-allele identity.
  • Coevolution of pollen and style S genes was hypothesized to maintain recognition as new S-alleles emerge.

Purpose of the Study:

  • To investigate the evolutionary relationship between pollen S (SLF/SFB) and style S (S-RNase) genes.
  • To test the hypothesis of coevolution between these interacting genes in plant self-incompatibility.

Main Methods:

  • Comparative analysis of S-locus gene evolution across different plant families (Solanaceae, Rosaceae, Plantaginaceae).
  • Examination of the evolutionary timelines of S-RNase and SLF/SFB genes within these families.

Main Results:

  • Cognate pairs of SLF/SFB and S-RNase genes do not exhibit coevolution in most analyzed cases.
  • Some pollen S (SLF/SFB) genes appear to have evolved more recently than their corresponding style S (S-RNase) genes.

Conclusions:

  • The expected coevolutionary model for S-locus genes is challenged by current evolutionary data.
  • Discrepancies suggest potential misidentification of some pollen S genes or a fundamental gap in understanding S-locus evolution.