Evolutionary potential for increased invasiveness: High-Performance Polygonum cespitosum genotypes are competitively superior in full sun

American Journal of Botany
Caleb T Corliss, Sonia E Sultan

Abstract

The presence of genetic variation for traits that contribute to ecological range expansion can provide the potential for introduced taxa to evolve greater invasiveness. Genotypes that contribute to the spread of introduced range populations must have the ability to maintain fitness under changing environmental stress and competitive intensity. Previously, we identified a subset of genotypes in populations of the invasive annual Polygonum cespitosum that express consistently high reproductive fitness in diverse (shaded, dry, and resource-rich) conditions. Here, we investigated whether these broadly adaptive (High-Performance) genotypes also show a competitive advantage over conspecifics in full sun and/or shade. We grew a population-balanced sample of 13 High-Performance and 13 'Control' genotypes in intraspecific competitive arrays, comprising all four possible combinations of High-Performance vs. Control target plants and competitive backgrounds, in both full sun and shaded glasshouse environments. In full sun, High-Performance genotypes (1) better maintained growth and reproductive output despite competition and (2) more strongly suppressed growth and reproduction of target plants. However, genotypes did not differ significan...Continue Reading

Citations

Apr 11, 2019·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Brennan H BakerRobin Waterman
Jul 27, 2021·Frontiers in Plant Science·Harihar Jaishree SubrahmaniamFabrice Roux

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