Abstract:
:The sustainability of modern agriculture relies on strategies that can control the ability of pathogens to overcome chemicals or genetic resistances through natural selection. This evolutionary potential, which depends partly on effective population size (N e ), is greatly influenced by human activities. In this context, wild pathogen populations can provide valuable information for assessing the long-term risk associated with crop pests. In this study, we estimated the effective population size of the beet cyst nematode, Heterodera schachtii, by sampling 34 populations infecting the sea beet Beta vulgaris spp. maritima twice within a one-year period. Only 20 populations produced enough generations to analyze the variation in allele frequencies, with the remaining populations showing a high mortality rate of the host plant after only 1 year. The 20 analyzed populations showed surprisingly low effective population sizes, with most having N e close to 85 individuals. We attribute these low values to the variation in population size through time, systematic inbreeding, and unbalanced sex-ratios. Our results suggest that H. schachtii has low evolutionary potential in natural environments. Pest control strategies in which populations on crops mimic wild populations may help prevent parasite adaptation to host resistance.
journal_name
Evol Appljournal_title
Evolutionary applicationsauthors
Jan PL,Gracianne C,Fournet S,Olivier E,Arnaud JF,Porte C,Bardou-Valette S,Denis MC,Petit EJdoi
10.1111/eva.12352subject
Has Abstractpub_date
2016-02-11 00:00:00pages
489-501issue
3issn
1752-4571pii
EVA12352journal_volume
9pub_type
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