Low genetic differentiation among seasonal cohorts in Senecio vulgaris as revealed by amplified fragment length polymorphism analysis.

Abstract:

:Common groundsel, Senecio vulgaris (Asteraceae), is a highly selfing semelparous ephemeral weed that belongs to the few plant species in central Europe capable of growing, flowering and fruiting all year round. In temperate climates, flowering S. vulgaris cohorts were found to appear up to three times per year. Using amplified fragment length polymorphism (AFLP) molecular markers we examined temporal genetic differentiation among spring, summer and autumn cohorts at each of seven sites located in two regions in Switzerland. Strong genetic differentiation among cohorts may indicate the existence of seasonal races of S. vulgaris, reproductively isolated by nonoverlapping flowering phenologies. Analysis of molecular variance (amova) revealed that < 2.5% of the AFLP variation resided among cohorts within sites, whereas there was significant genetic differentiation among plants from different sites (15.6%) and among individuals within cohorts (81.9%). Significant genetic differentiation was also observed between the two regions. Isolation-by-distance was found on a regional scale, but not on a local scale. Gene flow was estimated to be approximately 15-fold higher among cohorts within sites than among sites. We further found, on average, similar levels of genetic diversity within the three seasonal cohorts. The results of this study demonstrate that season of growth represents a weak barrier for genetic exchange among S. vulgaris populations and does not affect molecular variance. Therefore, there is no evidence for the existence of seasonally specialized races of S. vulgaris. We discuss some implications of the results for the biological control of S. vulgaris using a native rust fungus.

journal_name

Mol Ecol

journal_title

Molecular ecology

authors

Haldimann P,Steinger T,Müller-Schärer H

doi

10.1046/j.1365-294x.2003.01915.x

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

2541-51

issue

10

eissn

0962-1083

issn

1365-294X

pii

1915

journal_volume

12

pub_type

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