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Progeny sex ratios in dioecious Silene latifolia (Caryophyllaceae)


, : Progeny sex ratios in dioecious Silene latifolia (Caryophyllaceae). American Journal of Botany 80(5): 551-556

Most sex ratios reported for Silene latifolia are female biased. As a result of experiments performed by Correns in the early l900s, pollen tube competition has generally been accepted as the primary cause of these skewed ratios. We did four sets of hand pollinations in which we varied the size of pollen loads and placement of pollen along the filamentous stigma. The effect of pollen load size on progeny sex ratios was not statistically significant. Of 32 maternal families, 17 contained more females than males (one ratio deviated statistically from 1:1), and 13 contained more males than females. Paternal families exhibited a greater range of sex ratios, including three with a significant female bias and one with a significant male bias. Within experiments, neither the maternal parent nor where pollen was placed had a statistically significant effect on progeny sex ratios; the paternal effect was significant in one experiment. We suggest that sex ratios in Silene latifolia are not necessarily affected by the level of pollen competition. Other factors, including variation among males and sex-linked mortality, may help explain the skewed sex ratios that characterize populations of this species. Further, Correns' observations of excess females may have resulted from his use of interspecific hybrids. Reprinted by permission of the publisher. .

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Accession: 002468619

DOI: 10.2307/2445371

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Related references

Carroll S.B.; Mulcahy D.L., 1991: The relationship between pollen grain size and progeny gender in dioecious silene latifolia caryophyllaceae. Experiments and observations conducted during the past 90 years have provided conflicting evidence concerning the existence of a size difference between pollen grains containing an X chromosome (female-determining) and those containing a Y chromos...

Carroll S.B.; Mulcahy D.L., 1990: Unexpected progeny sex ratios in dioecious silene latifolia. American Journal of Botany 77(6 SUPPL): 51

Taylor, D.R., 1996: Parental expenditure and offspring sex ratios in the dioecious plant Silene alba (= Silene latifolia). The selection pressures that influence the sex ratios in the perennial plant Silene alba were investigated. The female-biased sex ratio of S. alba was shown to originate prior to the end of the period of parental investment, with no difference in...

Gehring, J.L.; Linhart, Y.B., 1993: Sexual dimorphisms and response to low resources in the dioecious plant Silene latifolia (Caryophyllaceae). A study examined whether females of Silene latifolia reduce growth or reproductive effort to a greater extent than males in conditions of low resource availability. Females of dioecious plants have to allocate energy to both flower and fruit produ...

Carroll, S.B.; Delph, L.F., 1996: The effects of gender and plant architecture on allocation to flowers in dioecious Silene latifolia (Caryophyllaceae). The reproductive allocation patterns for flowering in the dioecious, short-lived perennial Silene latifolia were examined. Males of this species invested 11 percent more biomass in flowers than females, although individual female flowers were heav...

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Gehring, J., L.; Monson, R., K., 1994: Sexual differences in gas exchange and response to environmental stress in dioecious Silene latifolia (Caryophyllaceae). Females of dioecious species usually have higher reproductive effort than males because they produce fruits in addition to flowers. Since females have higher reproductive effort, they are expected to be more negatively affected than males by low r...

Wang, X., 2005: Reproduction and progeny of Silene latifolia (Caryophyllaceae) as affected by atmospheric CO2 concentration. Sexual dimorphism in plants has been known for over two millennia. However, little is known about how male and female reproduction of dioecious species will respond to anthropogenic environmental perturbations. Using growth chambers, the effects o...

Teixeira, S.; Bernasconi, G., 2008: Effects of inbred/outbred crosses on progeny sex ratio in Silene latifolia (Caryophyllaceae). Sex ratio polymorphism has been extensively studied in Silene latifolia, but it is neither known whether inbreeding (which is likely to occur under field conditions) affects it, nor which of the proposed mechanisms (Y degeneration, X-linked drive)...

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