Factors Affecting Inter- and Intra-specific Pollen Rejection in Nicotiana

McClure, Bruce; Cruz‐García, Felipe; Beecher, Brian; Sulaman, Waheeda

doi:10.1006/anbo.1999.1061

Cited by 88 publications

(93 citation statements)

References 85 publications

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“…S-RNases function as both pistil-side recognition proteins and as cytotoxins in SI, and their recognition function determines S-specificity on the pistil side. Allelic S-RNase sequences often show striking levels of divergence; for example, S A2 -and S C10 -RNase from Nicotiana alata show only 43% identity (McClure et al, 2000). S-specificity has been investigated by in vitro mutagenesis and domain-swap experiments (Kao and McCubbin, 1996;Matton et al, 1997;Zurek et al, 1997) with divergent results.…”

Section: S-rnase-based Simentioning

confidence: 99%

Pollen-Pistil Interactions and Their Role in Mate Selection

et al. 2016

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Section: S-rnase-based Simentioning

confidence: 99%

Pollen-Pistil Interactions and Their Role in Mate Selection

et al. 2016

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“…A low frequency of selfing is frequently observed in otherwise SI and outcrossing species (reviewed by Levin, 1996;Vogler and Kalisz, 2001;Goodwillie et al, 2005), and for some model SI systems, a variety of loci and mechanisms responsible for selfing have been identified (reviewed by McClure et al, 2000). Although direct suppression of S locus genes is sometimes the causal factor of SI breakdown, empirical evidence suggests that unlinked S-modifier loci that generate quantitative variation in SI expression are more often the rule (McClure et al, 2000).…”

mentioning

confidence: 99%

“…Although direct suppression of S locus genes is sometimes the causal factor of SI breakdown, empirical evidence suggests that unlinked S-modifier loci that generate quantitative variation in SI expression are more often the rule (McClure et al, 2000). A theoretical understanding is emerging of the range of conditions under which mixed mating systems that combine SI and intermediate selfing rates are evolutionary stable (Vallejo-Marín and Uyenoyama, 2004;Porcher and Lande, 2005;Harder et al, 2007;Johnston et al, 2009).…”

mentioning

confidence: 99%

Sporophytic self-incompatibility in Senecio squalidus (Asteraceae): S allele dominance interactions and modifiers of cross-compatibility and selfing rates

2010

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Understanding genetic mechanisms of self-incompatibility (SI) and how they evolve is central to understanding the mating behaviour of most outbreeding angiosperms. Sporophytic SI (SSI) is controlled by a single multi-allelic locus, S, which is expressed in the diploid (sporophyte) plant to determine the SI phenotype of its haploid (gametophyte) pollen. This allows complex patterns of independent S allele dominance interactions in male (pollen) and female (pistil) reproductive tissues. Senecio squalidus is a useful model for studying the genetic regulation and evolution of SSI because of its population history as an alien invasive species in the UK. S. squalidus maintains a small number of S alleles (7-11) with a high frequency of dominance interactions. Some S. squalidus individuals also show partial selfing and/or greater levels of cross-compatibility than expected under SSI. We previously speculated that these might be adaptations to invasiveness. Here we describe a detailed characterization of the regulation of SSI in S. squalidus. Controlled crosses were used to determine the S allele dominance hierarchy of six S alleles and effects of modifiers on cross-compatibility and partial selfing. Complex dominance interactions among S alleles were found with at least three levels of dominance and tissue-specific codominance. Evidence for S gene modifiers that increase selfing and/or cross-compatibility was also found. These empirical findings are discussed in the context of theoretical predictions for maintenance of S allele dominance interactions, and the role of modifier loci in the evolution of SI.

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“…A weakness of this model is that it fails to accommodate a role for three stylar proteins known to be required for self pollen tube inhibition: the small, asparagine-rich HT-B protein; the 120K glycoprotein, which like S-RNases is taken up nonspecifically into the pollen tube; and factor 4936 (Lind et al, 1996;McClure et al, 1999McClure et al, , 2000O'Brien et al, 2002;Hancock et al, 2005). It also does not account for the recently observed dynamic subcellular distribution of S-RNases in pollen tubes.…”

Section: Si By Cytotoxic S-rnases and Degradation Of Pollen Tube Rnamentioning

confidence: 99%

“…As pollen tube growth progresses, these S-RNasecontaining compartments break down in self pollen tubes, presumably releasing S-RNases into the cytoplasm, but they remain intact in non-self tubes. Loss of HT-B, factor 4936, or 120K (e.g., by mutation or down-regulation mediated by antisense or RNAi constructs; McClure et al, 1999McClure et al, , 2000O'Brien et al, 2002;Hancock et al, 2005), which overcomes SI, also prevents disintegration of S-RNase compartments (Goldraij et al, 2006). Furthermore, HT-B accumulates to much lower levels in non-self compared to self tubes, suggesting that destabilization of HT-B is associated with successful pollen tube growth (Goldraij et al, 2006).…”

Section: Si By Cytotoxic S-rnases and Degradation Of Pollen Tube Rnamentioning

confidence: 99%

Self-incompatibility systems: barriers to self-fertilization in flowering plants

Rea¹,

Nasrallah²

2008

Int. J. Dev. Biol.

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Flowering plants (angiosperms) are the most prevalent and evolutionarily advanced group of plants. Success of these plants is owed to several unique evolutionary adaptations that aid in reproduction: the flower, the closed carpel, double fertilization, and the ultimate products of fertilization, seeds enclosed in the fruit. Angiosperms exhibit a vast array of reproductive strategies, including both asexual and sexual, the latter of which includes both self-fertilization and cross-fertilization. Asexual reproduction and self-fertilization are important reproductive strategies in a variety of situations, such as when mates are scarce or when the environment remains relatively stable. However, reproductive strategies promoting cross-fertilization are critical to angiosperm success, since they contribute to the creation of genetically diverse populations, which increase the probability that at least one individual in a population will survive given changing environmental conditions. The evolution of several physical and genetic barriers to self-fertilization or fertilization among closely related individuals is thus widespread in angiosperms. A major genetic barrier to self-fertilization is self-incompatibility (SI), which allows female reproductive cells to discriminate between "self" and "non-self" pollen, and specifically reject self pollen. Evidence for the importance of SI in angiosperm evolution lies in the highly diverse set of mechanisms used by various angiosperm families for recognition of self pollen tube development and preventing self-fertilization.

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Factors Affecting Inter- and Intra-specific Pollen Rejection in Nicotiana

Cited by 88 publications

References 85 publications

Pollen-Pistil Interactions and Their Role in Mate Selection

Pollen-Pistil Interactions and Their Role in Mate Selection

Sporophytic self-incompatibility in Senecio squalidus (Asteraceae): S allele dominance interactions and modifiers of cross-compatibility and selfing rates

Self-incompatibility systems: barriers to self-fertilization in flowering plants

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