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Plasticity in leakiness

Citation

Pannell, John (2020), Plasticity in leakiness, Dryad, Dataset, https://doi.org/10.5061/dryad.nvx0k6dqq

Abstract

In dioecious plants, males and females frequently show ‘leaky’ sex expression, with individuals occasionally producing flowers of the opposite sex. This leaky sex expression may have enabled the colonization of oceanic islands by dioecious plant species, and it is likely to represent the sort of variation upon which selection acts to bring about evolutionary transitions from dioecy to hermaphroditism. Although leakiness is commonly reported for dioecious species, it is not known whether it has plastic component. The question is interesting because males or females with an ability to enhance their leakiness plastically in the absence of mates would have an advantage of being able to produce progeny by self-fertilization. Here, we demonstrate that leaky sex expression in the wind-pollinated dioecious herb Mercurialis annua is plastically responsive to its mating context. We compared experimental populations of females growing either with or without males. Females growing in the absence of males were leakier in their sex expression than controls growing with males, producing more than twice as many male flowers. Our results thus provide a striking instance of plasticity in the reproductive behavior of plants that is likely adaptive. We consider how females might sense their mating environment as a function of pollen availability, and we discuss possible constraints on the evolution of plasticity in sex expression when the environmental signals that individuals receive are unreliable. 

Methods

See text of paper. 

Usage Notes

The file 'Plasticity-data.txt' contains data collected on females grown in populations (plots) with our without males. Each row corresponds to a different female. 

treatment: Cntr=treatment in which females were grown with males; Sel=treatment in which females were grown without males

plot: there were three replicate plots for each of the two treatment levels

pot: the label number for the pot in which the target female was grown

nb_male_flowers: the number of male flowers recorded per plant. These were converted to biomass by multiplying by 0.0002046914 g per flower. 

seedw_g: the biomass of seeds and fruits, in g 

drymass_g: the dry biomass of the above-ground parts of the plant, in g

 

Funding

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Award: 31003A_141052