Ecological patterns and genetic analysis of post-dispersal seed predation in sunflower (Helianthus annuus) crop-wild hybrids

Molecular Ecology
Jennifer M DechaineJohn M Burke

Abstract

Crop-wild hybridization has been documented in many cultivated species, but the ecological and genetic factors that influence the likelihood or rate that cultivar alleles will introgress into wild populations are poorly understood. Seed predation is one factor that could mitigate the spread of otherwise advantageous cultivar alleles into the wild by reducing seedling recruitment of crop-like individuals in hybrid populations. Seed predation has previously been linked to several seed characters that differ between cultivated and wild sunflower, such as seed size and oil content. In this study, seed morphological and nutritional characters were measured in a segregating population of sunflower crop-wild hybrids and wild and cultivated lines. Seed predation rates among lines were then assessed in the field. The relationship between seed predation and seed characters was investigated and quantitative trait loci (QTL) were mapped for all traits. There was no effect of seed type (hybrid vs. parents) on seed predation, although a trend toward more early predation of wild seeds was observed. Within the hybrids, seed predators preferred seeds that contained more oil and energy but were lower in fibre. The relationship between seed preda...Continue Reading

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Citations

Mar 28, 2012·BMC Plant Biology·Brigitte UwimanaClemens C M van de Wiel
Feb 8, 2014·BMC Plant Biology·Stephanie A PearlJohn M Burke
Mar 13, 2014·Biological Reviews of the Cambridge Philosophical Society·Rowena L LongWilliam E Finch-Savage
Nov 8, 2011·American Journal of Botany·Zhao LaiLoren H Rieseberg
Aug 30, 2019·Evolutionary Applications·Alejandro PresottoKristin L Mercer
Jul 13, 2014·American Journal of Botany·Helen M AlexanderKristin L Mercer

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