Effects of floral display size on male and female reproductive success in Mimulus ringens
Open Access
- 31 August 2011
- journal article
- research article
- Published by Oxford University Press (OUP) in Annals of Botany
- Vol. 109 (3), 563-570
- https://doi.org/10.1093/aob/mcr193
Abstract
The number of flowers blooming simultaneously on a plant may have profound consequences for reproductive success. Large floral displays often attract more pollinator visits, increasing outcross pollen receipt. However, pollinators frequently probe more flowers in sequence on large displays, potentially increasing self-pollination and reducing pollen export per flower. To better understand how floral display size influences male and female fitness, we manipulated display phenotypes and then used paternity analysis to quantify siring success and selfing rates. To facilitate unambiguous assignment of paternity, we established four replicate (cloned) arrays of Mimulus ringens, each consisting of genets with unique combinations of homozygous marker genotypes. In each array, we trimmed displays to two, four, eight or 16 flowers. When fruits ripened, we counted the number of seeds per fruit and assigned paternity to 1935 progeny. Siring success per flower declined sharply with increasing display size, while female success per flower did not vary with display. The rate of self-fertilization increased for large floral displays, but siring losses due to geitonogamous pollen discounting were much greater than siring gains through increased self-fertilization. As display size increased, each additional seed sired through geitonogamous self-pollination was associated with a loss of 9·7 seeds sired through outcrossing. Although total fitness increased with floral display size, the marginal return on each additional flower declined steadily as display size increased. Therefore, a plant could maximize fitness by producing small displays over a long flowering period, rather than large displays over a brief flowering period.Keywords
This publication has 43 references indexed in Scilit:
- Pollinator visitation patterns strongly influence among-flower variation in selfing rateAnnals of Botany, 2009
- The influence of Mimulus ringens floral display size on pollinator visitation patternsFunctional Ecology, 2004
- Ecology and evolution of plant matingTrends in Ecology & Evolution, 1996
- Comparison of pollinator flight movements and gene dispersal patterns in Mimulus ringensHeredity, 1995
- The influence of population density on outcrossing rates in Mimulus ringensHeredity, 1995
- The Effect of Flower Production on Male Reproductive Success in Wild Radish PopulationsEvolution, 1992
- The Consequences of Pollination Biology for Selection of Mass or Extended BloomingFunctional Ecology, 1992
- Paternity Analysis in a Natural Population of Asclepias exaltata: Multiple Paternity, Functional Gender, and the "Pollen-Donation Hypothesis"Evolution, 1990
- Effects of Inflorescence Size on Pollination in Epilobium angustifoliumOikos, 1988
- Sexual strategies in plants III. A quantitative method for describing the gender of plantsNew Zealand Journal of Botany, 1980