Title of article :
The role of genetic mechanisms of sex determination in the survival of small populations of Silene littorea: A reintroduction experiment Original Research Article
Author/Authors :
Juan Carlos Vilas، نويسنده , , Carlos Garc?a، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2006
Pages :
10
From page :
124
To page :
133
Abstract :
Loss of genetic variation in populations may have other effects than inbreeding depression and loss of adaptive potential. In the case of the numerous gynodioecious plant species having cytonuclear systems of sex determination with dominant nuclear restorers of the male function, reduced genetic variation and increased inbreeding would increase the proportion of non-restorer recessive genes found in homozygosity, and therefore that of female plants producing pistillate flowers. This could have opposite effects on the extinction risk of the population. Female plants produce no pollen and may cause pollen limitation, but at the same time they may reduce average homozygosity and inbreeding depression because they are forced outcrossers. We observed that inbreeding indeed increased the frequency of female plants and pistillate flowers in the population, and that this effect was accompanied by reductions in population recruitment independent of inbreeding depression and likely due to pollen limitation. These results suggest that dominant nuclear restorers of pollen production speed up the extinction of small populations of Silene littorea, and that sex determination mechanisms might be an important factor to consider in the conservation of many plant species.
Keywords :
pollen limitation , Gynodioecious plants , inbreeding , Cytonuclear sex determination , extinction risk
Journal title :
Biological Conservation
Serial Year :
2006
Journal title :
Biological Conservation
Record number :
837466
Link To Document :
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