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Population genetics of self-incompatibility in a clade of relict cliff-dwelling plant species

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ABSTRACT

This study highlights the value of performing detailed mating system studies in plant species of high conservation value, such as the rare and relict species of Sonchus section Pustulati described here. This study adds to the evidence that outcrossing mating systems based on SSI are highly resilient even under long-term conditions of small, fragmented, and isolated populations, possibly due to mating system flexibility with the presence of some selfing and the fact that high cross-compatibility is achieved for relatively modest dominantly expressed S allele polymorphism. We highlight the importance of taking mating system factors into account as part of conservation efforts.

No MeSH data available.


Relationships between the mean index of self-incompatibility (Mean ISI; Lloyd 1965; Raduski et al. 2011) across populations of the species of Sonchus section Pustulati and a) effective population size, and b) population plant density.
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plw029-F3: Relationships between the mean index of self-incompatibility (Mean ISI; Lloyd 1965; Raduski et al. 2011) across populations of the species of Sonchus section Pustulati and a) effective population size, and b) population plant density.

Mentions: Strongly expressed SI was common in S. masguindalii and both the Moroccan and Spanish ranges of S. pustulatus, and these were classified as SI taxa (mean ISI = 0.84 ± 0.13, 0.90 ± 0.12 and 0.80 ± 0.11, respectively; Table 1). In contrast, S. fragilis showed a lower ISI and was classified as a pSI species (mean ISI = 0.42 ± 0.05; Table 1). At the population level, seven and four populations from the three species were classified as SI and pSI, respectively, and one population of S. fragilis (DER) was classified as SC (ISI = 0.11 ± 0.06; Table 1). At the intra-population level, the proportion of pSI and SC plants ranged from 0% to 50% and from 0% to 80%, respectively (Fig. 2). The mean ISI in populations was not related to the density of plants (P = 0.245) nor to the effective population size (P = 0.844; Fig. 3).Figure 2.


Population genetics of self-incompatibility in a clade of relict cliff-dwelling plant species
Relationships between the mean index of self-incompatibility (Mean ISI; Lloyd 1965; Raduski et al. 2011) across populations of the species of Sonchus section Pustulati and a) effective population size, and b) population plant density.
© Copyright Policy - creative-commons
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4940477&req=5

plw029-F3: Relationships between the mean index of self-incompatibility (Mean ISI; Lloyd 1965; Raduski et al. 2011) across populations of the species of Sonchus section Pustulati and a) effective population size, and b) population plant density.
Mentions: Strongly expressed SI was common in S. masguindalii and both the Moroccan and Spanish ranges of S. pustulatus, and these were classified as SI taxa (mean ISI = 0.84 ± 0.13, 0.90 ± 0.12 and 0.80 ± 0.11, respectively; Table 1). In contrast, S. fragilis showed a lower ISI and was classified as a pSI species (mean ISI = 0.42 ± 0.05; Table 1). At the population level, seven and four populations from the three species were classified as SI and pSI, respectively, and one population of S. fragilis (DER) was classified as SC (ISI = 0.11 ± 0.06; Table 1). At the intra-population level, the proportion of pSI and SC plants ranged from 0% to 50% and from 0% to 80%, respectively (Fig. 2). The mean ISI in populations was not related to the density of plants (P = 0.245) nor to the effective population size (P = 0.844; Fig. 3).Figure 2.

View Article: PubMed Central - PubMed

ABSTRACT

This study highlights the value of performing detailed mating system studies in plant species of high conservation value, such as the rare and relict species of Sonchus section Pustulati described here. This study adds to the evidence that outcrossing mating systems based on SSI are highly resilient even under long-term conditions of small, fragmented, and isolated populations, possibly due to mating system flexibility with the presence of some selfing and the fact that high cross-compatibility is achieved for relatively modest dominantly expressed S allele polymorphism. We highlight the importance of taking mating system factors into account as part of conservation efforts.

No MeSH data available.